def wifi():
print('wifi init')
pycom.rgbled(0x009999) # blue
wlan = WLAN(mode=WLAN.AP,
ssid='waterLevel',
auth=(WLAN.WPA2, 'ucuenca1234'),
channel=7,
antenna=WLAN.INT_ANT)
serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
serversocket.bind(socket.getaddrinfo(
host, port)[0][-1]) #ipServer 192.168.4.1
except Exception as e:
print('bind failed, error code: ', str(e[0]))
sys.exit()
serversocket.listen(1)
print('socket is now listening over port: ', port)
wifiSocket = True
while (wifiSocket):
print('socket init')
sc, addr = serversocket.accept()
print('sc: ', sc, ' addr: ', addr)
recibido = sc.recv(16)
print('valor recibido :', recibido)
print('dato[0]: ', recibido[0])
wifiSocket, msg = calibrationType(recibido)
sc.send(msg)
print('closing wifi and socket')
sc.close()
serversocket.close()
wlan.deinit()
def find_wifi(testCase=None):
wlan = WLAN(mode=WLAN.STA)
try:
if isinstance(testCase, Exception):
raise testCase
wlan.disconnect()
nets = wlan.scan()
for net in nets:
if net.ssid == WIFI_AP['name']:
#print(net, net[4])
if not testCase == 'Not found':
rssi = net[4]
break
else:
rssi = -10000
wlan.deinit()
except Exception as e:
return -10000
if testCase is not None and not testCase == 'Not found':
rssi = testCase
if rssi >= 0:
return -10000
return rssi
def get_WLAN():
global wlan
if wlan == None:
wlan = WLAN(mode=WLAN.STA)
if wlan.isconnected():
return True
nets = wlan.scan()
for net in nets:
if net.ssid == config.WLAN_SSID:
debugprint('Network found!')
wlan.connect(net.ssid,
auth=(net.sec, config.WLAN_WPA),
timeout=5000)
attempts = 0
while (not wlan.isconnected()) and (attempts < 10):
debugprint('Connecting...')
attempts = attempts + 1
time.sleep(1)
if wlan.isconnected():
debugprint('WLAN connection succeeded')
return True
else:
debugprint('WLAN connection failed')
end_WLAN()
return False
debugprint('No known WLAN SSID found')
wlan.deinit()
wlan = None
return False
def setup_new_config(logger):
"""
Start a WiFi AP that provides a configuration page.
The device automatically reboots and applies modifications upon successful configuration.
:param logger: status logger
:type logger: LoggerFactory
"""
# Only one of this thread is allowed to run at a time
if not wifi_lock.locked():
with wifi_lock:
logger.info("New configuration setup started")
# Config uses LED colours to indicate the state of the connection - lock is necessary to disable error pings
led_lock.acquire(1)
unique_id = ubinascii.hexlify(machine.unique_id()).decode()
# set pycom up as access point
wlan = WLAN(mode=WLAN.AP,
ssid=config.get_config("device_name") + unique_id)
# Connect to PmSensor using password set by the user
wlan.init(
mode=WLAN.AP,
ssid=config.get_config("device_name") + unique_id,
auth=(WLAN.WPA2, config.get_config("password")),
channel=1,
antenna=WLAN.INT_ANT,
)
# Load HTML via entering 192,168.4.10 to browser
wlan.ifconfig(
id=1,
config=("192.168.4.10", "255.255.255.0", "192.168.4.1",
"192.168.4.1"),
)
logger.info("Access point turned on as {}".format(
config.get_config("device_name") + unique_id))
logger.info(
"Configuration website can be accessed at 192.168.4.10")
address = socket.getaddrinfo(
"0.0.0.0", 80)[0][-1] # Accept stations from all addresses
sct = socket.socket() # Create socket for communication
sct.settimeout(int(
float(config.get_config("config_timeout")) *
60)) # session times out after x seconds
gc.collect(
) # frees up unused memory if there was a previous connection
sct.bind(address) # Bind address to socket
sct.listen(1) # Allow one station to connect to socket
pycom.rgbled(0x000055) # Blue LED - waiting for connection
get_new_config(sct, logger)
wlan.deinit() # turn off wifi
gc.collect()
logger.info("rebooting...")
machine.reset()
def preSetup(self):
wlan = WLAN()
wlan.deinit() #Wlan uitschakelen
# Uitschakelen van LTE en Bluetooth zorgt voor een grote vertraging. Normaal zijn deze niet actief dus moeten ze niet uitgeschakeld worden.
# lte = LTE()
# lte.deinit(reset=True) #lte (4G) uitschakelen
# ble = Bluetooth()
# ble.deinit() #Disable Bluetooth
print("preSetup completed")
def bringup_wlan(ext_ant=False):
wlan = WLAN()
wlan.deinit()
init_kwargs = {
"mode": WLAN.STA,
"antenna": WLAN.INT_ANT if not ext_ant else WLAN.EXT_ANT
}
wlan.init(**init_kwargs)
return wlan
def __cli_activation_over_wifi(self, activation_info):
print('Please wait while we try to connect to {}'.format(
activation_info.get('s')))
from network import WLAN
wlan = WLAN(mode=WLAN.STA)
attempt = 0
known_nets = [((activation_info['s'], activation_info['p']))] # noqa
print_debug(3, 'WLAN connected? {}'.format(wlan.isconnected()))
while not wlan.isconnected() and attempt < 10:
attempt += 1
print_debug(3, "Wifi connection attempt: {}".format(attempt))
print_debug(3, 'WLAN connected? {}'.format(wlan.isconnected()))
available_nets = None
while available_nets is None:
try:
available_nets = wlan.scan()
for x in available_nets:
print_debug(5, x)
time.sleep(3)
except:
pass
nets = frozenset([e.ssid for e in available_nets])
known_nets_names = frozenset([e[0] for e in known_nets])
net_to_use = list(nets & known_nets_names)
try:
net_to_use = net_to_use[0]
pwd = dict(known_nets)[net_to_use]
sec = [e.sec for e in available_nets
if e.ssid == net_to_use][0] # noqa
print_debug(
99, "Connecting with {} and {}".format(net_to_use, pwd))
if sec == 0:
wlan.connect(net_to_use, timeout=10000)
else:
wlan.connect(net_to_use, (sec, pwd), timeout=10000)
start_time = time.time()
while not wlan.isconnected():
if time.time() - start_time > timeout:
raise TimeoutError(
'Timeout trying to connect via WiFi')
time.sleep(0.1)
except Exception as e:
if str(e) == "list index out of range" and attempt == 3:
print("Please review Wifi SSID and password!")
wlan.deinit()
return None
elif attempt == 3:
print("Error connecting using WIFI: %s" % e)
return None
class ConnectWIFI:
def __init__(self):
self.wlan = WLAN(mode=WLAN.STA)
def connectwifi(self):
if self.isConnected():
print("Wifi Connected")
else:
self.SSID = config.wifissid
self.PASSWORD = config.wifipassword
timeout = time.time() + 10
self.wlan.connect(self.SSID,
auth=(WLAN.WPA, self.PASSWORD),
channel=9)
while not self.wlan.isconnected():
if time.time() > timeout:
pycom.rgbled(config.LED_ERROR)
time.sleep(0.5)
pycom.rgbled(config.LED_ERROR)
machine.reset()
print(".", end="")
pycom.rgbled(config.LED_blink_WIFI)
time.sleep(0.5)
pycom.rgbled(0x000000)
time.sleep(0.5)
machine.idle() # save power while waiting
print('.........WiFi connected........')
print("Wifi Config --> ", self.wlan.ifconfig())
def isConnected(self):
if self.wlan.isconnected():
return True
else:
return False
def deinit(self):
print('Deinitializing wifi radio')
self.wlan.deinit()
def disconnect(self):
print("disconnecting wifi")
self.wlan.disconnect()
def reconnect(self):
if self.isConnected():
print("wifi connected")
else:
print("Trying to reconnect")
self.__init__()
self.connectwifi()
def set_wlan_to_access_point(ssid="wipy_https_server",
password="******",
host_ip="192.168.4.1",
log=lambda msg: None):
log("Creating Access Point {} with password {}".format(ssid, password))
wlan = WLAN()
wlan.deinit()
wlan.ifconfig(config=(host_ip, '255.255.255.0', '0.0.0.0', '8.8.8.8'))
wlan.init(mode=WLAN.AP,
ssid=ssid,
auth=(WLAN.WPA2, password),
channel=5,
antenna=WLAN.INT_ANT)
return wlan
def software_update(logger):
with wifi_lock:
try:
logger.info("Over the Air update started")
led_lock.acquire(1) # disable all other indicator LEDs
pycom.rgbled(0x555500) # Yellow LED
# Get credentials from configuration
ssid = config.get_config("SSID")
password = config.get_config("wifi_password")
server_ip = config.get_config("server")
port = int(config.get_config("port"))
print(ssid, password, server_ip, port)
# Perform OTA update
ota = WiFiOTA(ssid, password, server_ip, port)
# Turn off WiFi to save power
w = WLAN()
w.deinit()
ota.connect()
ota.update()
time.sleep(5)
except Exception as e:
logger.exception("Failed to update the device")
pycom.rgbled(0x550000)
time.sleep(3)
finally:
# Turn off update mode
config.save_configuration({"update": False})
pycom.rgbled(0x000000)
led_lock.release()
# Reboot the device to apply patches
machine.reset()
def connect_wifi(network, password, oled):
wlan = WLAN()
wlan.deinit()
wlan.init(mode=WLAN.STA)
wlan.ifconfig(config=('dhcp'))
wlan.scan() # scan for available networks
wlan.connect(ssid=network, auth=(WLAN.WPA2, password))
for _ in range(15):
if wlan.isconnected():
print("Joining Success")
# Boot Text with version
oled.fill(0)
oled.text("Connected to:", 0, 0)
oled.text(network, 0, 15)
oled.text("IP Address:", 0, 40)
oled.text(wlan.ifconfig()[0], 0, 55)
oled.show()
utime.sleep_ms(1000)
return
else:
# Boot Text with version
oled.fill(0)
oled.text("Connecting to:", 0, 0)
oled.text(network, 0, 15)
oled.show()
utime.sleep_ms(1000)
# WiFi Creds probably broken
print("Can't Join Clearing Credentials")
kv.set("AP_PWD", False)
kv.set("AP_SSID", False)
oled.fill(0)
oled.text("Failed to", 0, 0)
oled.text("connect to:", 0, 15)
oled.text(network, 0, 30)
oled.text("Rebooting", 0, 55)
oled.show()
utime.sleep_ms(3000)
machine.reset()
def wifiTask():
global wifi_wdt_lock, wifi_stop_flag
logger = Logger(name='WIFI ' + __version__,
level=logging.INFO,
filename=None)
logger.info('** WIFI Task started **')
wlan = WLAN()
wlan.deinit()
uid = str(binascii.hexlify(machine.unique_id())[6:])
Ssid = 'ENS-PP-' + uid[2:8]
logger.info('Using Hidden AP SSID:' + Ssid)
wlan.init(mode=WLAN.AP,
ssid=Ssid,
auth=(WLAN.WPA2, 'Li56#fd0gertQQ'),
channel=8,
antenna=WLAN.INT_ANT,
hidden=True)
server = network.Server()
server.deinit() # disable the server
# enable the server again with new settings
server.init(login=('ensuser', 'n0ty0urbu5ine55'), timeout=120)
wifi_ap_init_done = True
while not wifi_stop_flag.locked():
if wifi_wdt_lock.locked():
wifi_wdt_lock.release()
time.sleep(1)
if fota_wifi_release_sem.locked() and wifi_ap_init_done == True:
wlan.deinit()
wifi_ap_init_done = False
wlan = None
logger.info('Deinit AP mode for FOTA')
try:
wlan.deinit()
except:
pass
logger.error('** WIFI Task ended **')
def software_update(logger):
"""
Connects to the wlan and fetches updates from a server. After having applied the patches successfully, it reboots
the device.
:param logger: status logger
:type logger: LoggerFactory object
"""
with wifi_lock:
try:
logger.info("Over the Air update started")
led_lock.acquire(1) # disable all other indicator LEDs
pycom.rgbled(0x555500) # Yellow LED
# Get credentials from configuration
ssid = config.get_config("SSID")
password = config.get_config("wifi_password")
server_ip = config.get_config("server")
port = int(config.get_config("port"))
logger.info("SSID: " + str(ssid))
logger.info("server_ip: " + str(server_ip))
logger.info("port: " + str(port))
version = config.get_config("code_version")
# Perform OTA update
ota = WiFiOTA(logger, ssid, password, server_ip, port, version)
# Turn off WiFi to save power
w = WLAN()
w.deinit()
logger.info("connecting...")
ota.connect()
if ota.update():
new_version = str(
ota.get_current_version()) # get updated version
config.save_config({"code_version": str(new_version)
}) # save new version to config on SD
logger.info(
"Successfully updated the device from version {} to version {}"
.format(version, new_version))
except Exception as e:
logger.exception("Failed to update the device")
pycom.rgbled(0x550000) # turn LED to RED
time.sleep(3)
finally:
# Turn off update mode
config.save_config({"update": False})
# Turn off indicator LED
pycom.rgbled(0x000000)
led_lock.release()
# Reboot the device to apply patches
logger.info("rebooting...")
machine.reset()
class NanoGateway:
"""
Nano gateway class, set up by default for use with TTN, but can be configured
for any other network supporting the Semtech Packet Forwarder.
Only required configuration is wifi_ssid and wifi_password which are used for
connecting to the Internet.
"""
PROTOCOL_VERSION = const(2)
PUSH_DATA = const(0)
PUSH_ACK = const(1)
PULL_DATA = const(2)
PULL_ACK = const(4)
PULL_RESP = const(3)
TX_ERR_NONE = 'NONE'
TX_ERR_TOO_LATE = 'TOO_LATE'
TX_ERR_TOO_EARLY = 'TOO_EARLY'
TX_ERR_COLLISION_PACKET = 'COLLISION_PACKET'
TX_ERR_COLLISION_BEACON = 'COLLISION_BEACON'
TX_ERR_TX_FREQ = 'TX_FREQ'
TX_ERR_TX_POWER = 'TX_POWER'
TX_ERR_GPS_UNLOCKED = 'GPS_UNLOCKED'
UDP_THREAD_CYCLE_MS = const(10)
STAT_PK = {
'stat': {
'time': '',
'lati': 0,
'long': 0,
'alti': 0,
'rxnb': 0,
'rxok': 0,
'rxfw': 0,
'ackr': 100.0,
'dwnb': 0,
'txnb': 0
}
}
RX_PK = {
'rxpk': [{
'time': '',
'tmst': 0,
'chan': 0,
'rfch': 0,
'freq': 0,
'stat': 1,
'modu': 'LORA',
'datr': '',
'codr': '4/5',
'rssi': 0,
'lsnr': 0,
'size': 0,
'data': ''
}]
}
TX_ACK_PK = {'txpk_ack': {'error': ''}}
def __init__(self,
wifi_ssid,
wifi_password,
gateway_id=None,
server='router.eu.thethings.network',
port=1700,
frequency=868100000,
datarate='SF7BW125',
ntp_server='pool.ntp.org',
ntp_period=3600):
# If unset, set the Gateway ID to be the first 3 bytes
# of MAC address + 'FFFE' + last 3 bytes of MAC address
if gateway_id is None:
gateway_id = ubinascii.hexlify(machine.unique_id()).upper()
gateway_id = gateway_id[:6] + 'FFFE' + gateway_id[6:12]
self.gateway_id = gateway_id
self.server = server
self.port = port
self.frequency = frequency
self.datarate = datarate
self.wifi_ssid = wifi_ssid
self.wifi_password = wifi_password
self.ntp_server = ntp_server
self.ntp_period = ntp_period
self.server_ip = None
self.rxnb = 0
self.rxok = 0
self.rxfw = 0
self.dwnb = 0
self.txnb = 0
self.sf = self._dr_to_sf(self.datarate)
self.bw = self._dr_to_bw(self.datarate)
self.stat_alarm = None
self.pull_alarm = None
self.uplink_alarm = None
self.wlan = None
self.sock = None
self.udp_stop = False
self.udp_lock = _thread.allocate_lock()
self.lora = None
self.lora_sock = None
self.rtc = machine.RTC()
def start(self):
"""
Starts the nano gateway.
"""
self.log('Starting nano gateway with id {}', self.gateway_id)
# Change WiFi to STA mode and connect
self.wlan = WLAN(mode=WLAN.STA)
self._connect_to_wifi()
# Get a time sync
self.log('Syncing time with {} ...', self.ntp_server)
self.rtc.ntp_sync(self.ntp_server, update_period=self.ntp_period)
while not self.rtc.synced():
utime.sleep_ms(50)
self.log('RTC NTP sync complete')
# Get the server IP and create an UDP socket
self.server_ip = usocket.getaddrinfo(self.server, self.port)[0][-1]
self.log('Opening UDP socket to {} ({}) port {}...', self.server,
self.server_ip[0], self.server_ip[1])
self.sock = usocket.socket(usocket.AF_INET, usocket.SOCK_DGRAM,
usocket.IPPROTO_UDP)
self.sock.setsockopt(usocket.SOL_SOCKET, usocket.SO_REUSEADDR, 1)
self.sock.setblocking(False)
# Push the first time stat immediately
self._push_data(self._make_stat_packet())
# Create the alarms
self.stat_alarm = machine.Timer.Alarm(
handler=lambda t: self._push_data(self._make_stat_packet()),
s=60,
periodic=True)
self.pull_alarm = machine.Timer.Alarm(
handler=lambda u: self._pull_data(), s=25, periodic=True)
# Start the UDP receive thread
self.udp_stop = False
_thread.start_new_thread(self._udp_thread, ())
# Initialize the LoRa radio in LORA mode
self.log('Setting up LoRa socket on {:.1f} Mhz using {}',
self._freq_to_float(self.frequency), self.datarate)
self.lora = LoRa(mode=LoRa.LORA,
frequency=self.frequency,
bandwidth=self.bw,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
# Create a raw LoRa socket
self.lora_sock = usocket.socket(usocket.AF_LORA, usocket.SOCK_RAW)
self.lora_sock.setblocking(False)
self.lora.callback(trigger=(LoRa.RX_PACKET_EVENT
| LoRa.TX_PACKET_EVENT),
handler=self._lora_cb)
self.log('Nano gateway online')
def stop(self):
"""
Stops the nano gateway.
"""
self.log('Stopping...')
# Send the LoRa radio to sleep
self.lora.callback(trigger=None, handler=None)
self.lora.power_mode(LoRa.SLEEP)
# Stop the NTP sync
self.rtc.ntp_sync(None)
# Cancel all the alarms
self.stat_alarm.cancel()
self.pull_alarm.cancel()
# Signal the UDP thread to stop
self.udp_stop = True
while self.udp_stop:
utime.sleep_ms(50)
# Disable WLAN
self.wlan.disconnect()
self.wlan.deinit()
def _connect_to_wifi(self):
self.wlan.connect(self.wifi_ssid, auth=(None, self.wifi_password))
while not self.wlan.isconnected():
utime.sleep_ms(50)
self.log('WiFi connected: {}', self.wifi_ssid)
def _dr_to_sf(self, dr):
sf = dr[2:4]
if sf[1] not in '0123456789':
sf = sf[:1]
return int(sf)
def _dr_to_bw(self, dr):
bw = dr[-5:]
if bw == 'BW125':
return LoRa.BW_125KHZ
elif bw == 'BW250':
return LoRa.BW_250KHZ
else:
return LoRa.BW_500KHZ
def _sf_bw_to_dr(self, sf, bw):
dr = 'SF' + str(sf)
if bw == LoRa.BW_125KHZ:
return dr + 'BW125'
elif bw == LoRa.BW_250KHZ:
return dr + 'BW250'
else:
return dr + 'BW500'
def _lora_cb(self, lora):
"""
Event listener for LoRa radio events.
"""
events = lora.events()
if events & LoRa.RX_PACKET_EVENT:
self.rxnb += 1
self.rxok += 1
rx_data = self.lora_sock.recv(256)
stats = lora.stats()
packet = self._make_node_packet(rx_data, self.rtc.now(),
stats.rx_timestamp, stats.sfrx,
self.bw, stats.rssi, stats.snr)
self.log('Received packet: {}', packet)
self._push_data(packet)
self.rxfw += 1
if events & LoRa.TX_PACKET_EVENT:
self.log('Re-initing LoRa radio after transmission')
self.txnb += 1
lora.init(mode=LoRa.LORA,
frequency=self.frequency,
bandwidth=self.bw,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
def _freq_to_float(self, frequency):
"""
MicroPython has some inprecision when doing large float division.
To counter this, this method first does integer division until we
reach the decimal breaking point. This doesn't completely elimate
the issue in all cases, but it does help for a number of commonly
used frequencies.
"""
divider = 6
while divider > 0 and frequency % 10 == 0:
frequency = frequency // 10
divider -= 1
if divider > 0:
frequency = frequency / (10**divider)
return frequency
def _make_stat_packet(self):
now = self.rtc.now()
self.STAT_PK['stat']['time'] = '%d-%02d-%02d %02d:%02d:%02d GMT' % (
now[0], now[1], now[2], now[3], now[4], now[5])
self.STAT_PK['stat']['rxnb'] = self.rxnb
self.STAT_PK['stat']['rxok'] = self.rxok
self.STAT_PK['stat']['rxfw'] = self.rxfw
self.STAT_PK['stat']['dwnb'] = self.dwnb
self.STAT_PK['stat']['txnb'] = self.txnb
return ujson.dumps(self.STAT_PK)
def _make_node_packet(self, rx_data, rx_time, tmst, sf, bw, rssi, snr):
self.RX_PK['rxpk'][0]['time'] = '%d-%02d-%02dT%02d:%02d:%02d.%dZ' % (
rx_time[0], rx_time[1], rx_time[2], rx_time[3], rx_time[4],
rx_time[5], rx_time[6])
self.RX_PK['rxpk'][0]['tmst'] = tmst
self.RX_PK['rxpk'][0]['freq'] = self._freq_to_float(self.frequency)
self.RX_PK['rxpk'][0]['datr'] = self._sf_bw_to_dr(sf, bw)
self.RX_PK['rxpk'][0]['rssi'] = rssi
self.RX_PK['rxpk'][0]['lsnr'] = float(snr)
self.RX_PK['rxpk'][0]['data'] = ubinascii.b2a_base64(rx_data)[:-1]
self.RX_PK['rxpk'][0]['size'] = len(rx_data)
return ujson.dumps(self.RX_PK)
def _push_data(self, data):
token = uos.urandom(2)
packet = bytes([self.PROTOCOL_VERSION]) + token + bytes(
[self.PUSH_DATA]) + ubinascii.unhexlify(self.gateway_id) + data
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except BaseException as ex:
self.log('Failed to push uplink packet to server: {}', ex)
def _pull_data(self):
token = uos.urandom(2)
packet = bytes([self.PROTOCOL_VERSION]) + token + bytes(
[self.PULL_DATA]) + ubinascii.unhexlify(self.gateway_id)
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except BaseException as ex:
self.log('Failed to pull downlink packets from server: {}', ex)
def _ack_pull_rsp(self, token, error):
self.TX_ACK_PK['txpk_ack']['error'] = error
resp = ujson.dumps(self.TX_ACK_PK)
packet = bytes([self.PROTOCOL_VERSION]) + token + bytes(
[self.PULL_ACK]) + ubinascii.unhexlify(self.gateway_id) + resp
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except BaseException as ex:
self.log('PULL RSP ACK exception: {}', ex)
def _send_down_link(self, data, tmst, datarate, frequency):
"""
Transmits a downlink message over LoRa.
"""
self.lora.init(mode=LoRa.LORA,
frequency=frequency,
bandwidth=self._dr_to_bw(datarate),
sf=self._dr_to_sf(datarate),
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
while utime.ticks_us() < tmst:
pass
self.lora_sock.send(data)
self.log(
'Sent downlink packet scheduled for {:.3f}, at {:.1f} Mhz using {}: {}',
tmst / 1000000, self._freq_to_float(frequency), datarate, data)
def _udp_thread(self):
"""
UDP thread, reads data from the server and handles it.
"""
while not self.udp_stop:
try:
data, src = self.sock.recvfrom(1024)
_token = data[1:3]
_type = data[3]
if _type == self.PUSH_ACK:
self.log('Push ack')
elif _type == self.PULL_ACK:
self.log('Pull ack')
elif _type == self.PULL_RESP:
self.dwnb += 1
ack_error = self.TX_ERR_NONE
tx_pk = ujson.loads(data[4:])
tmst = tx_pk['txpk']['tmst']
t_us = tmst - utime.ticks_us() - 12500
if t_us < 0:
t_us += 0xFFFFFFFF
if t_us < 20000000:
self.uplink_alarm = machine.Timer.Alarm(
handler=lambda x: self._send_down_link(
ubinascii.a2b_base64(tx_pk['txpk']['data']),
tx_pk['txpk']['tmst'] - 50, tx_pk['txpk'][
'datr'],
int(tx_pk['txpk']['freq'] * 1000000)),
us=t_us)
else:
ack_error = self.TX_ERR_TOO_LATE
self.log('Downlink timestamp error!, t_us: {}', t_us)
self._ack_pull_rsp(_token, ack_error)
self.log('Pull rsp')
else:
self.log('Unknown message type from server: {}', _type)
except usocket.timeout:
pass
except OSError as ex:
if ex.errno != errno.EAGAIN:
self.log('UDP recv OSError Exception: {}', ex)
except BaseException as ex:
self.log('UDP recv Exception: {}', ex)
# Wait before trying to receive again
utime.sleep_ms(self.UDP_THREAD_CYCLE_MS)
self.sock.close()
self.udp_stop = False
self.log('UDP thread stopped')
def log(self, message, *args):
"""
Prints a log message to the stdout.
"""
print('[{:>10.3f}] {}'.format(utime.ticks_ms() / 1000,
str(message).format(*args)))
def http_daemon(ssid="OpenScale", password="******", path_to_handler={}):
host_ip = "192.168.4.1"
print("Creating Access Point {} with password {}".format(ssid, password))
print("User will need to connect to the webpage at {}".format(host_ip))
wlan = WLAN()
wlan.deinit()
wlan.ifconfig(config=(host_ip, '255.255.255.0', '0.0.0.0', '8.8.8.8'))
wlan.init(mode=WLAN.AP,
ssid=ssid,
auth=(WLAN.WPA2, password),
channel=5,
antenna=WLAN.INT_ANT)
# The address of the board at port 80
address = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
s = socket.socket()
s.bind(address)
s.listen(5)
print('listening on ', address)
while True:
connection_socket, address = s.accept()
connection_socket.setblocking(False)
print('New connection from', address)
msg = connection_socket.recv(MAX_HTTP_MESSAGE_LENGTH).decode()
msg = msg.replace("\r\n", "\n")
blank_line_split = msg.split('\n\n')
if len(blank_line_split) != 2:
raise Exception("Malformated HTTP request.")
preamble = blank_line_split[0].split("\n")
request = preamble[0]
request_keys = ["method", "path", "version"]
request_key_value = zip(request_keys, request.split(" "))
request = {key: value for key, value in request_key_value}
headers = preamble[1:]
headers = {
line.split(":")[0].strip(): line.split(":")[1].strip()
for line in headers
}
for key, value in headers.items():
request[key] = value
print("Received Request:\n{}".format(request))
request['body'] = blank_line_split[1]
if 'Content-Length' in request:
content_length = int(request['Content-Length'])
if len(request['body']) < content_length:
print(
"Attempting to retrieve {} ({} remaining) bytes of content"
.format(content_length,
content_length - len(request['body'])))
while len(request['body']) != content_length:
new_segment = connection_socket.recv(
MAX_HTTP_MESSAGE_LENGTH).decode()
request['body'] += new_segment
if request['path'] not in path_to_handler:
print("{} not found in path_to_handler".format(request['path']))
response = not_configured_response
else:
endpoint_handler = path_to_handler[request['path']]
print("Path found. Passing to {}".format(endpoint_handler))
response = endpoint_handler(**request)
print("Sending response")
connection_socket.send(response)
connection_socket.close()
class Scanner:
def __init__(self):
# Initialize wlan
self.wlan = WLAN(mode=WLAN.STA)
# Internal (WLAN.INT_ANT) or external (WLAN.EXT_ANT) antenna
self.wlan.antenna(WLAN.INT_ANT)
self.nets = []
# Define the named tuple that contains the WiFi access point information
self.net = namedtuple('net',
('ssid', 'bssid', 'sec', 'channel', 'rssi'))
def get(self, testNetworksValid=False, testNetworks=[]):
if testNetworksValid:
self.nets = testNetworks
else:
# Scan available networks
self.nets = self.wlan.scan(type=WLAN.SCAN_PASSIVE, scantime=120)
# Switch WiFi off
self.wlan.deinit()
# Nets is defined None if no networks are found
if self.nets is None:
self.nets = []
# If more than one network, order the list by RSSI (strongest first)
if len(self.nets) > 1:
sorted(self.nets, key=self.__byRssi_key)
# Flash file storage not used because it is slow
#self.storeNets(self.convertNetList(self.nets))
#print(self.readNets())
return self.nets
# Convert from list of named tuples to list of dictionaries
# ssid', 'bssid', 'sec', 'channel', 'rssi'
def convertNetList(self, tupleNetList):
dictNetList = []
for tupleNet in tupleNetList:
dictNet = {
"ssid": tupleNet.ssid,
"bssid": tupleNet.bssid,
"sec": tupleNet.sec,
"channel": tupleNet.channel,
"rssi": tupleNet.rssi
}
dictNetList.append(dictNet)
return dictNetList
def writeLongList(self, name, longVars, maxLen):
i = 0
while i < len(longVars) and i < maxLen:
pycom.nvs_set(name + str(i) + 'l',
struct.unpack(">I", longVars[i][-4:])[0])
pycom.nvs_set(name + str(i) + 'm',
struct.unpack(">H", longVars[i][0:2])[0])
i = i + 1
try:
pycom.nvs_erase(name + str(i) + 'l')
pycom.nvs_erase(name + str(i) + 'm')
except:
return
else:
return
def readLongList(self, name):
longVars = []
i = 0
while True:
try:
lsb = pycom.nvs_get(name + str(i) + 'l')
msb = pycom.nvs_get(name + str(i) + 'm')
except:
break
else:
longVars.append(struct.pack(">HI", msb, lsb))
i = i + 1
return longVars
def writeStore(self):
macList = []
i = 0
while i < len(self.nets):
macList.append(self.nets[i].bssid)
i = i + 1
self.writeLongList('net', macList, 10)
return
def readStore(self):
macList = self.readLongList('net')
self.storedNets = []
for mac in macList:
self.storedNets.append(
self.net(ssid='', bssid=mac, sec=0, channel=1, rssi=-100))
return self.storedNets
def storeNets(self, nets):
f = open('data.txt', 'w+')
for net in nets:
f.write(repr(net) + '\n')
f.close()
def readNets(self):
dictNetList = []
f = open('data.txt')
nets = f.readlines()
for net in nets:
dictNetList.append(eval(net))
f.close()
return dictNetList
def createMessage(self):
message = bytearray()
i = 0
while i < len(self.nets) and i < 3:
# Add BSSID to the LoRa message
message = message + self.nets[i].bssid
# Add RSSI (without minus) to the LoRa message
message.append(self.nets[i].rssi * -1)
i = i + 1
return message
def netDiff(self, nets1=[], nets2=[]):
matchCnt = 0
# Define the named tuple that contains the result of the matching
diffRes = namedtuple('diffRes', ('net1', 'net2', 'match', 'noMatch'))
for net1 in nets1:
for net2 in nets2:
if net1.bssid == net2.bssid:
matchCnt = matchCnt + 1
noMatchCnt = len(nets1) + len(nets2) - (2 * matchCnt)
return diffRes(net1=len(nets1),
net2=len(nets2),
match=matchCnt,
noMatch=noMatchCnt)
def __byRssi_key(self, net):
return net.rssi
class PybytesConnection:
def __init__(self, config, message_callback):
if config is not None:
self.__conf = config
try:
self.__host = pycom.nvs_get('pybytes_server')
except:
self.__host = config.get('server')
self.__ssl = config.get('ssl', False)
self.__ssl_params = config.get('ssl_params', {})
self.__user_name = config.get('username')
self.__device_id = config.get('device_id')
self.__mqtt_download_topic = "d" + self.__device_id
self.__mqtt_upload_topic = "u" + self.__device_id
self.__pybytes_protocol = PybytesProtocol(
config, message_callback, pybytes_connection=self
)
self.__connection = None
self.__connection_status = constants.__CONNECTION_STATUS_DISCONNECTED
self.__lora_socket = None
self.lora = None
self.lora_lock = _thread.allocate_lock()
self.__sigfox_socket = None
self.lte = None
self.wlan = None
self.__network_type = None
self.__wifi_lte_watchdog = None
def lte_ping_routine(self, delay):
while True:
self.send_ping_message()
time.sleep(delay)
def print_pretty_response(self, rsp):
lines = rsp.split('\r\n')
for line in lines:
if line:
if line not in ['OK']:
print(line)
def __initialise_watchdog(self):
if self.__conf.get('connection_watchdog', True):
self.__wifi_lte_watchdog = WDT(
timeout=constants.__WDT_TIMEOUT_MILLISECONDS
)
print('Initialized watchdog for WiFi and LTE connection with timeout {} ms'.format(constants.__WDT_TIMEOUT_MILLISECONDS)) # noqa
else:
print('Watchdog for WiFi and LTE was disabled, enable with "connection_watchdog": true in pybytes_config.json') # noqa
# Establish a connection through WIFI before connecting to mqtt server
def connect_wifi(self, reconnect=True, check_interval=0.5, timeout=120):
self.__initialise_watchdog()
if self.__connection_status != constants.__CONNECTION_STATUS_DISCONNECTED: # noqa
print("Error connect_wifi: Connection already exists. Disconnect First") # noqa
return False
try:
from network import WLAN
antenna = self.__conf.get('wlan_antenna', WLAN.INT_ANT)
known_nets = [((self.__conf['wifi']['ssid'], self.__conf['wifi']['password']))] # noqa
if antenna == WLAN.EXT_ANT:
print("WARNING! Using external WiFi antenna.")
'''to connect it to an existing network,
the WiFi class must be configured as a station'''
self.wlan = WLAN(mode=WLAN.STA, antenna=antenna)
attempt = 0
print_debug(3, 'WLAN connected? {}'.format(self.wlan.isconnected()))
while not self.wlan.isconnected() and attempt < 3:
attempt += 1
print_debug(3, "Wifi connection attempt: {}".format(attempt))
print_debug(3, 'WLAN connected? {}'.format(self.wlan.isconnected()))
available_nets = None
while available_nets is None:
try:
available_nets = self.wlan.scan()
for x in available_nets:
print_debug(5, x)
time.sleep(1)
except:
pass
nets = frozenset([e.ssid for e in available_nets])
known_nets_names = frozenset([e[0]for e in known_nets])
net_to_use = list(nets & known_nets_names)
try:
net_to_use = net_to_use[0]
pwd = dict(known_nets)[net_to_use]
sec = [e.sec for e in available_nets if e.ssid == net_to_use][0] # noqa
print_debug(99, "Connecting with {} and {}".format(net_to_use, pwd))
if sec == 0:
self.wlan.connect(net_to_use, timeout=10000)
else:
self.wlan.connect(net_to_use, (sec, pwd), timeout=10000)
start_time = time.time()
while not self.wlan.isconnected():
if time.time() - start_time > timeout:
raise TimeoutError('Timeout trying to connect via WiFi')
time.sleep(0.1)
except Exception as e:
if str(e) == "list index out of range" and attempt == 3:
print("Please review Wifi SSID and password inside config")
self.wlan.deinit()
return False
elif attempt == 3:
print("Error connecting using WIFI: %s" % e)
return False
self.__network_type = constants.__NETWORK_TYPE_WIFI
print("WiFi connection established")
try:
self.__connection = MQTTClient(
self.__device_id,
self.__host,
self.__mqtt_download_topic,
self.__pybytes_protocol,
user=self.__user_name,
password=self.__device_id
)
self.__connection.connect()
self.__connection_status = constants.__CONNECTION_STATUS_CONNECTED_MQTT_WIFI # noqa
self.__pybytes_protocol.start_MQTT(
self,
constants.__NETWORK_TYPE_WIFI
)
return True
except Exception as ex:
if '{}'.format(ex) == '4':
print('MQTT ERROR! Bad credentials when connecting to server: "{}"'.format(self.__host)) # noqa
else:
print("MQTT ERROR! {}".format(ex))
return False
except Exception as ex:
print("Exception connect_wifi: {}".format(ex))
return False
# Establish a connection through LTE before connecting to mqtt server
def connect_lte(self, activation_info=False, start_mqtt=True):
if activation_info:
lte_cfg = activation_info
else:
lte_cfg = self.__conf.get('lte')
self.__initialise_watchdog()
if lte_cfg is not None:
if (os.uname()[0] not in ['FiPy', 'GPy']):
print("You need a device with FiPy or GPy firmware to connect via LTE") # noqa
return False
try:
from network import LTE
time.sleep(3)
if lte_cfg.get('carrier', 'standard') == 'standard':
carrier = None
else:
carrier = lte_cfg.get('carrier')
print_debug(1, 'LTE init(carrier={}, cid={})'.format(carrier, lte_cfg.get('cid', 1))) # noqa
# instantiate the LTE object
self.lte = LTE(carrier=carrier, cid=lte_cfg.get('cid', 1))
try:
lte_type = lte_cfg.get('type') if len(lte_cfg.get('type')) > 0 else None
except:
lte_type = None
try:
lte_apn = lte_cfg.get('apn') if len(lte_cfg.get('type')) > 0 else None
except:
lte_apn = None
try:
lte_band = int(lte_cfg.get('band'))
except:
lte_band = None
print_debug(
1,
'LTE attach(band={}, apn={}, type={})'.format(
lte_band,
lte_apn,
lte_type
)
)
self.lte.attach(band=lte_band, apn=lte_apn, type=lte_type) # noqa # attach the cellular modem to a base station
while not self.lte.isattached():
time.sleep(0.25)
time.sleep(1)
print_debug(1, 'LTE connect()')
# start a data session and obtain an IP address
self.lte.connect()
print_debug(1, 'LTE is_connected()')
while not self.lte.isconnected():
time.sleep(0.25)
print("LTE connection established")
self.__network_type = constants.__NETWORK_TYPE_LTE
if start_mqtt:
try:
self.__connection = MQTTClient(
self.__device_id,
self.__host,
self.__mqtt_download_topic,
self.__pybytes_protocol,
user=self.__user_name,
password=self.__device_id
)
self.__connection.connect()
self.__connection_status = constants.__CONNECTION_STATUS_CONNECTED_MQTT_LTE # noqa
self.__pybytes_protocol.start_MQTT(
self,
constants.__NETWORK_TYPE_LTE
)
print("Connected to MQTT {}".format(self.__host))
return True
except Exception as ex:
if '{}'.format(ex) == '4':
print('MQTT ERROR! Bad credentials when connecting to server: "{}"'.format(self.__host)) # noqa
else:
print("MQTT ERROR! {}".format(ex))
return False
except Exception as ex:
print("Exception connect_lte: {}".format(ex))
sys.print_exception(ex)
return False
else:
print("Error... missing configuration!")
return False
# LORA
def connect_lora_abp(self, lora_timeout, nanogateway):
print_debug(1,'Attempting to connect via LoRa')
if (self.__connection_status != constants.__CONNECTION_STATUS_DISCONNECTED): # noqa
print("Error connect_lora_abp: Connection already exists. Disconnect First") # noqa
return False
try:
from network import LoRa
except Exception as ex:
print("This device does not support LoRa connections: %s" % ex)
return False
lora_class = self.__conf.get('lora', {}).get('class', 0)
if self.__conf.get('lora', {}).get('region') is not None:
self.lora = LoRa(mode=LoRa.LORAWAN, region=self.__conf.get('lora').get('region'), device_class=lora_class)
else:
self.lora = LoRa(mode=LoRa.LORAWAN, device_class=lora_class)
self.lora.nvram_restore()
try:
dev_addr = self.__conf['lora']['abp']['dev_addr']
nwk_swkey = self.__conf['lora']['abp']['nwk_skey']
app_swkey = self.__conf['lora']['abp']['app_skey']
except Exception as ex:
print("Invalid LoRaWAN ABP configuration!")
print_debug(1, ex)
return False
timeout_ms = self.__conf.get('lora_timeout', lora_timeout) * 1000
dev_addr = struct.unpack(">l", binascii.unhexlify(dev_addr.replace(' ', '')))[0] # noqa
nwk_swkey = binascii.unhexlify(nwk_swkey.replace(' ', ''))
app_swkey = binascii.unhexlify(app_swkey.replace(' ', ''))
try:
print("Trying to join LoRa.ABP for %d seconds..." % self.__conf.get('lora_timeout', lora_timeout))
self.lora.join(
activation=LoRa.ABP,
auth=(dev_addr, nwk_swkey, app_swkey),
timeout=timeout_ms
)
# if you want, uncomment this code, but timeout must be 0
# while not self.lora.has_joined():
# print("Joining...")
# time.sleep(5)
self.__open_lora_socket(nanogateway)
# print_debug(5, 'Stack size: {}'.format(self.__thread_stack_size))
# _thread.stack_size(self.__thread_stack_size)
# _thread.start_new_thread(self.__check_lora_messages, ())
return True
except Exception as e:
message = str(e)
if message == 'timed out':
print("LoRa connection timeout: %d seconds" % self.__conf.get('lora_timeout', lora_timeout))
else:
print_debug(3, 'Exception in LoRa connect: {}'.format(e))
return False
def connect_lora_otaa(self, lora_timeout, nanogateway):
print_debug(1,'Attempting to connect via LoRa')
if (self.__connection_status != constants.__CONNECTION_STATUS_DISCONNECTED): # noqa
print("Error connect_lora_otaa: Connection already exists. Disconnect First") # noqa
return False
try:
from network import LoRa
except Exception as ex:
print("This device does not support LoRa connections: %s" % ex)
return False
try:
dev_eui = self.__conf['lora']['otaa']['app_device_eui']
app_eui = self.__conf['lora']['otaa']['app_eui']
app_key = self.__conf['lora']['otaa']['app_key']
except Exception as ex:
print("Invalid LoRaWAN OTAA configuration!")
print_debug(1, ex)
return False
timeout_ms = self.__conf.get('lora_timeout', lora_timeout) * 1000
lora_class = self.__conf.get('lora', {}).get('class', 0)
if self.__conf.get('lora', {}).get('region') is not None:
self.lora = LoRa(mode=LoRa.LORAWAN, region=self.__conf.get('lora', {}).get('region'), device_class=lora_class)
else:
self.lora = LoRa(mode=LoRa.LORAWAN, device_class=lora_class)
self.lora.nvram_restore()
dev_eui = binascii.unhexlify(dev_eui.replace(' ', ''))
app_eui = binascii.unhexlify(app_eui.replace(' ', ''))
app_key = binascii.unhexlify(app_key.replace(' ', ''))
try:
if not self.lora.has_joined():
print("Trying to join LoRa.OTAA for %d seconds..." % self.__conf.get('lora_timeout', lora_timeout))
self.lora.join(
activation=LoRa.OTAA,
auth=(dev_eui, app_eui, app_key),
timeout=timeout_ms
)
# if you want, uncomment this code, but timeout must be 0
# while not self.lora.has_joined():
# print("Joining...")
# time.sleep(5)
self.__open_lora_socket(nanogateway)
# print_debug(5, 'Stack size: {}'.format(self.__thread_stack_size))
# _thread.stack_size(self.__thread_stack_size)
# _thread.start_new_thread(self.__check_lora_messages, ())
return True
except Exception as e:
message = str(e)
if message == 'timed out':
print("LoRa connection timeout: %d seconds" % self.__conf.get('lora_timeout', lora_timeout))
else:
print_debug(3, 'Exception in LoRa connect: {}'.format(e))
return False
def __open_lora_socket(self, nanogateway):
if (nanogateway):
for i in range(3, 16):
self.lora.remove_channel(i)
self.lora.add_channel(0, frequency=868100000, dr_min=0, dr_max=5)
self.lora.add_channel(1, frequency=868100000, dr_min=0, dr_max=5)
self.lora.add_channel(2, frequency=868100000, dr_min=0, dr_max=5)
print("Setting up LoRa socket...")
self.__lora_socket = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
self.__lora_socket.setsockopt(socket.SOL_LORA, socket.SO_DR, 5)
self.__connection_status = constants.__CONNECTION_STATUS_CONNECTED_LORA
self.__pybytes_protocol.start_Lora(self)
print("Connected using LoRa")
# SIGFOX
def connect_sigfox(self):
if (self.__connection_status != constants.__CONNECTION_STATUS_DISCONNECTED): # noqa
print("Error: Connection already exists. Disconnect First")
pass
try:
from network import Sigfox
except Exception:
print("This device does not support Sigfox connections")
return
sigfox_config = self.__conf.get('sigfox', {})
if sigfox_config is None or sigfox_config.get('RCZ') is None:
print(constants.__SIGFOX_WARNING)
try:
sf_rcz = int(sigfox_config.get('RCZ', 1)) - 1
if sf_rcz >= 0 and sf_rcz <= 3:
Sigfox(mode=Sigfox.SIGFOX, rcz=sf_rcz)
self.__sigfox_socket = socket.socket(socket.AF_SIGFOX, socket.SOCK_RAW) # noqa
self.__sigfox_socket.setblocking(True)
self.__sigfox_socket.setsockopt(socket.SOL_SIGFOX, socket.SO_RX, False) # noqa
self.__network_type = constants.__NETWORK_TYPE_SIGFOX
self.__connection_status = constants.__CONNECTION_STATUS_CONNECTED_SIGFOX # noqa
self.__pybytes_protocol.start_Sigfox(self)
print(
"Connected using Sigfox. Only upload stream is supported"
)
return True
else:
print('Invalid Sigfox RCZ specified in config!')
return False
except Exception as e:
print('Exception in connect_sigfox: {}'.format(e))
return False
# COMMON
def disconnect(self, keep_wifi=False, force=False):
if self.__wifi_lte_watchdog is not None:
self.__wifi_lte_watchdog = WDT(timeout=constants.__WDT_MAX_TIMEOUT_MILLISECONDS)
print('Watchdog timeout has been increased to {} ms'.format(constants.__WDT_MAX_TIMEOUT_MILLISECONDS)) # noqa
print_debug(
1,
'self.__connection_status={} | self.__network_type={}'.format(
self.__connection_status, self.__network_type
)
)
if (self.__connection_status == constants.__CONNECTION_STATUS_DISCONNECTED): # noqa
print_debug(3, "Already disconnected")
if (constants.__CONNECTION_STATUS_CONNECTED_MQTT_WIFI <= self.__connection_status <= constants.__CONNECTION_STATUS_CONNECTED_MQTT_LTE): # noqa
print_debug(1, 'MQTT over WIFI||LTE... disconnecting MQTT')
try:
self.__connection.disconnect(force=force)
self.__connection_status = constants.__CONNECTION_STATUS_DISCONNECTED # noqa
except Exception as e:
print("Error disconnecting: {}".format(e))
if (self.__connection_status == constants.__CONNECTION_STATUS_CONNECTED_LORA): # noqa
print_debug(1, 'Connected over LORA... closing socket and saving nvram') # noqa
try:
self.__lora_socket.close()
self.lora.nvram_save()
except Exception as e:
print("Error disconnecting: {}".format(e))
if (self.__connection_status == constants.__CONNECTION_STATUS_CONNECTED_SIGFOX): # noqa
print_debug(1, 'Connected over SIGFOX... closing socket')
try:
self.__sigfox_socket.close()
except Exception as e:
print("Error disconnecting: {}".format(e))
if (self.__network_type == constants.__NETWORK_TYPE_WIFI and not keep_wifi):
print_debug(1, 'Connected over WIFI... disconnecting')
try:
self.wlan.deinit()
except Exception as e:
print("Error disconnecting: {}".format(e))
if (self.__network_type == constants.__NETWORK_TYPE_LTE):
print_debug(1, 'Connected over LTE... disconnecting')
try:
lte_cfg = self.__conf.get('lte')
print_debug(1, 'lte.deinit(reset={})'.format(lte_cfg.get('reset', False))) # noqa
self.lte.deinit(reset=lte_cfg.get('reset', False))
except Exception as e:
print("Error disconnecting: {}".format(e))
self.__network_type = None
self.__connection_status = constants.__CONNECTION_STATUS_DISCONNECTED
def is_connected(self):
return not (self.__connection_status == constants.__CONNECTION_STATUS_DISCONNECTED) # noqa
# Added for convention with other connectivity classes
def isconnected(self):
return not (self.__connection_status == constants.__CONNECTION_STATUS_DISCONNECTED) # noqa
def disable():
wlan = WLAN()
logger.info("disabling wlan.")
wlan.deinit()
class NanoGateway:
"""
Nano gateway class, set up by default for use with TTN, but can be configured
for any other network supporting the Semtech Packet Forwarder.
Only required configuration is wifi_ssid and wifi_password which are used for
connecting to the Internet.
"""
def __init__(self, id, frequency, datarate, ssid, password, server, port, ntp_server='pool.ntp.org', ntp_period=3600):
self.id = id
self.server = server
self.port = port
self.frequency = frequency
self.datarate = datarate
self.ssid = ssid
self.password = password
self.ntp_server = ntp_server
self.ntp_period = ntp_period
self.server_ip = None
self.rxnb = 0
self.rxok = 0
self.rxfw = 0
self.dwnb = 0
self.txnb = 0
self.sf = self._dr_to_sf(self.datarate)
self.bw = self._dr_to_bw(self.datarate)
self.region = LoRa.AU915
self.stat_alarm = None
self.pull_alarm = None
self.uplink_alarm = None
self.wlan = None
self.sock = None
self.udp_stop = False
self.udp_lock = _thread.allocate_lock()
self.lora = None
self.lora_sock = None
self.rtc = machine.RTC()
def start(self):
"""
Starts the LoRaWAN nano gateway.
"""
self._log('Starting LoRaWAN nano gateway with id: {}', self.id)
# setup WiFi as a station and connect
self.wlan = WLAN(mode=WLAN.STA)
self._connect_to_wifi()
# get a time sync
self._log('Syncing time with {} ...', self.ntp_server)
self.rtc.ntp_sync(self.ntp_server, update_period=self.ntp_period)
while not self.rtc.synced():
utime.sleep_ms(50)
self._log("RTC NTP sync complete")
# get the server IP and create an UDP socket
self.server_ip = usocket.getaddrinfo(self.server, self.port)[0][-1]
self._log('Opening UDP socket to {} ({}) port {}...', self.server, self.server_ip[0], self.server_ip[1])
self.sock = usocket.socket(usocket.AF_INET, usocket.SOCK_DGRAM, usocket.IPPROTO_UDP)
self.sock.setsockopt(usocket.SOL_SOCKET, usocket.SO_REUSEADDR, 1)
self.sock.setblocking(False)
# push the first time immediatelly
self._push_data(self._make_stat_packet())
# create the alarms
self.stat_alarm = Timer.Alarm(handler=lambda t: self._push_data(self._make_stat_packet()), s=60, periodic=True)
self.pull_alarm = Timer.Alarm(handler=lambda u: self._pull_data(), s=25, periodic=True)
# start the UDP receive thread
self.udp_stop = False
_thread.start_new_thread(self._udp_thread, ())
# initialize the LoRa radio in LORA mode
self._log('Setting up the LoRa radio at {} Mhz using {}', self._freq_to_float(self.frequency), self.datarate)
self.lora = LoRa(
mode=LoRa.LORA,
region=self.region,
frequency=self.frequency,
bandwidth=self.bw,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
power_mode=LoRa.ALWAYS_ON,
#tx_iq=True
)
# create a raw LoRa socket
self.lora_sock = usocket.socket(usocket.AF_LORA, usocket.SOCK_RAW)
self.lora_sock.setblocking(False)
self.lora_tx_done = False
self.lora.callback(trigger=(LoRa.RX_PACKET_EVENT | LoRa.TX_PACKET_EVENT), handler=self._lora_cb)
if uos.uname()[0] == "LoPy":
self.window_compensation = -1000
else:
self.window_compensation = -6000
self.downlink_count = 0
self._log('LoRaWAN nano gateway online')
def stop(self):
"""
Stops the LoRaWAN nano gateway.
"""
self._log('Stopping...')
# send the LoRa radio to sleep
self.lora.callback(trigger=None, handler=None)
self.lora.power_mode(LoRa.SLEEP)
# stop the NTP sync
self.rtc.ntp_sync(None)
# cancel all the alarms
self.stat_alarm.cancel()
self.pull_alarm.cancel()
# signal the UDP thread to stop
self.udp_stop = True
while self.udp_stop:
utime.sleep_ms(50)
# disable WLAN
self.wlan.disconnect()
self.wlan.deinit()
def _connect_to_wifi(self):
self.wlan.connect(self.ssid, auth=(None, self.password))
while not self.wlan.isconnected():
utime.sleep_ms(50)
self._log('WiFi connected to: {}', self.ssid)
def _dr_to_sf(self, dr):
sf = dr[2:4]
if sf[1] not in '0123456789':
sf = sf[:1]
return int(sf)
def _dr_to_bw(self, dr):
bw = dr[-5:]
if bw == 'BW125':
return LoRa.BW_125KHZ
elif bw == 'BW250':
return LoRa.BW_250KHZ
else:
return LoRa.BW_500KHZ
def _sf_bw_to_dr(self, sf, bw):
dr = 'SF' + str(sf)
if bw == LoRa.BW_125KHZ:
return dr + 'BW125'
elif bw == LoRa.BW_250KHZ:
return dr + 'BW250'
else:
return dr + 'BW500'
def _lora_cb(self, lora):
"""
LoRa radio events callback handler.
"""
events = lora.events()
if events & LoRa.RX_PACKET_EVENT:
self.rxnb += 1
self.rxok += 1
rx_data = self.lora_sock.recv(256)
stats = lora.stats()
if DEBUG:
self._log("stats "+ujson.dumps(stats))
self._log('rx_timestamp diff: {}', utime.ticks_diff(stats.rx_timestamp,utime.ticks_cpu()))
packet = self._make_node_packet(rx_data, self.rtc.now(), stats.rx_timestamp, stats.sfrx, self.bw, stats.rssi, stats.snr)
packet = self.frequency_rounding_fix(packet, self.frequency)
self._log('Received and uploading packet: {}', packet)
self._push_data(packet)
self._log('after _push_data')
self.rxfw += 1
if events & LoRa.TX_PACKET_EVENT:
self.txnb += 1
lora.init(
mode=LoRa.LORA,
region=self.region,
frequency=self.frequency,
bandwidth=self.bw,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
power_mode=LoRa.ALWAYS_ON,
#tx_iq=True
)
def _freq_to_float(self, frequency):
"""
MicroPython has some inprecision when doing large float division.
To counter this, this method first does integer division until we
reach the decimal breaking point. This doesn't completely elimate
the issue in all cases, but it does help for a number of commonly
used frequencies.
"""
divider = 6
while divider > 0 and frequency % 10 == 0:
frequency = frequency // 10
divider -= 1
if divider > 0:
frequency = frequency / (10 ** divider)
return frequency
def frequency_rounding_fix(self, packet, frequency):
freq = str(frequency)[0:3] + '.' + str(frequency)[3]
start = packet.find("freq\":")
end = packet.find(",", start)
packet = packet[:start + 7] + freq + packet[end:]
return packet
def _make_stat_packet(self):
now = self.rtc.now()
STAT_PK["stat"]["time"] = "%d-%02d-%02d %02d:%02d:%02d GMT" % (now[0], now[1], now[2], now[3], now[4], now[5])
STAT_PK["stat"]["rxnb"] = self.rxnb
STAT_PK["stat"]["rxok"] = self.rxok
STAT_PK["stat"]["rxfw"] = self.rxfw
STAT_PK["stat"]["dwnb"] = self.dwnb
STAT_PK["stat"]["txnb"] = self.txnb
return ujson.dumps(STAT_PK)
def _make_node_packet(self, rx_data, rx_time, tmst, sf, bw, rssi, snr):
RX_PK["rxpk"][0]["time"] = "%d-%02d-%02dT%02d:%02d:%02d.%dZ" % (rx_time[0], rx_time[1], rx_time[2], rx_time[3], rx_time[4], rx_time[5], rx_time[6])
RX_PK["rxpk"][0]["tmst"] = tmst
RX_PK["rxpk"][0]["freq"] = self._freq_to_float(self.frequency)
RX_PK["rxpk"][0]["datr"] = self._sf_bw_to_dr(sf, bw)
RX_PK["rxpk"][0]["rssi"] = rssi
RX_PK["rxpk"][0]["lsnr"] = snr
RX_PK["rxpk"][0]["data"] = ubinascii.b2a_base64(rx_data)[:-1]
RX_PK["rxpk"][0]["size"] = len(rx_data)
return ujson.dumps(RX_PK)
def _push_data(self, data):
token = uos.urandom(2)
packet = bytes([PROTOCOL_VERSION]) + token + bytes([PUSH_DATA]) + ubinascii.unhexlify(self.id) + data
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('Failed to push uplink packet to server: {}', ex)
def _pull_data(self):
token = uos.urandom(2)
packet = bytes([PROTOCOL_VERSION]) + token + bytes([PULL_DATA]) + ubinascii.unhexlify(self.id)
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('Failed to pull downlink packets from server: {}', ex)
def _ack_pull_rsp(self, token, error):
TX_ACK_PK["txpk_ack"]["error"] = error
resp = ujson.dumps(TX_ACK_PK)
packet = bytes([PROTOCOL_VERSION]) + token + bytes([PULL_ACK]) + ubinascii.unhexlify(self.id) + resp
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('PULL RSP ACK exception: {}', ex)
def _send_down_link(self, data, tmst, datarate, frequency):
"""
Transmits a downlink message over LoRa.
"""
self.lora.init(
mode=LoRa.LORA,
region=self.region,
frequency=frequency,
bandwidth=self._dr_to_bw(datarate), # LoRa.BW_125KHZ
sf=self._dr_to_sf(datarate),
preamble=8,
coding_rate=LoRa.CODING_4_5,
power_mode=LoRa.ALWAYS_ON,
#tx_iq=True
)
if WINDOW_COMPENSATION=='cycle':
self.window_compensation = -((self.downlink_count % 25) * 1000)
else:
self.window_compensation = WINDOW_COMPENSATION
t_adj = utime.ticks_add(tmst, self.window_compensation)
self.lora_sock.settimeout(1)
t_cpu = utime.ticks_cpu()
self._log("BEFORE spin wait at {} late {}",t_cpu,t_cpu-tmst)
while utime.ticks_diff(t_adj, utime.ticks_cpu()) > 0:
pass
t_cpu = utime.ticks_cpu()
self._log("BEFORE lora_sock.send at {} late {} window_compensation {}",t_cpu,t_cpu-tmst,self.window_compensation)
self.lora_sock.send(data)
self._log("AFTER lora_sock.send late {}",utime.ticks_cpu()-tmst)
self.lora_sock.setblocking(False)
self._log(
'Sent downlink packet scheduled on {}, at {:,d} Hz using {}: {}',
tmst,
frequency,
datarate,
data
)
self.downlink_count += 1
def _send_down_link_class_c(self, data, datarate, frequency):
self.lora.init(
mode=LoRa.LORA,
frequency=frequency,
bandwidth=self._dr_to_bw(datarate),
sf=self._dr_to_sf(datarate),
preamble=8,
coding_rate=LoRa.CODING_4_5,
region=self.region,
power_mode=LoRa.ALWAYS_ON,
#tx_iq=True,
device_class=LoRa.CLASS_C
)
self.lora_sock.send(data)
self._log(
'Sent downlink packet scheduled on {}, at {:.3f} Mhz using {}: {}',
utime.ticks_cpu(),
self._freq_to_float(frequency),
datarate,
data
)
def _udp_thread(self):
"""
UDP thread, reads data from the server and handles it.
"""
loops = 0
while not self.udp_stop:
if loops % 20 == 19:
b4 = utime.ticks_cpu()
gc.collect()
self._log("gc.collect for {} us",utime.ticks_diff(utime.ticks_cpu(),b4))
b4 = utime.ticks_cpu()
utime.sleep_ms(UDP_THREAD_CYCLE_MS)
t_diff = utime.ticks_diff(utime.ticks_cpu(),b4)
if t_diff > (UDP_THREAD_CYCLE_MS*1000*1.5):
self._log("overslept! for {} us",t_diff)
try:
b4 = utime.ticks_cpu()
data, src = self.sock.recvfrom(1024)
self._log("sock.recvfrom for {} us",utime.ticks_diff(utime.ticks_cpu(),b4))
_token = data[1:3]
_type = data[3]
if _type == PUSH_ACK:
self._log("Push ack")
elif _type == PULL_ACK:
self._log("Pull ack")
elif _type == PULL_RESP:
self._log("Pull resp")
self.dwnb += 1
ack_error = TX_ERR_NONE
tx_pk = ujson.loads(data[4:])
if DEBUG:
self._log("tx data "+ujson.dumps(tx_pk))
payload = ubinascii.a2b_base64(tx_pk["txpk"]["data"])
# depending on the board, pull the downlink message 1 or 6 ms upfronnt
# tmst = utime.ticks_add(tx_pk["txpk"]["tmst"], self.window_compensation)
# t_us = utime.ticks_diff(utime.ticks_cpu(), utime.ticks_add(tmst, -15000))
tmst = tx_pk["txpk"]["tmst"]
t_req = utime.ticks_add(tmst, -RX_DELAY_TIMER_EARLY)
t_cpu = utime.ticks_cpu()
self._log("t_cpu {}",t_cpu)
t_us = utime.ticks_diff(t_req, t_cpu)
self._log("t_us {}",t_us)
if 1000 < t_us < 10000000:
self._log("Delaying for {} at {}, so should fire at t_req {}, compensated early_by {}",t_us,t_cpu,t_req,RX_DELAY_TIMER_EARLY)
def handler(x):
t_cpu = utime.ticks_cpu()
self._log("_send_down_link alarm fired at {} late {}us",t_cpu,t_cpu-t_req)
self._send_down_link(
payload,
tmst, tx_pk["txpk"]["datr"],
int(tx_pk["txpk"]["freq"] * 1000 + 0.0005) * 1000
)
self.uplink_alarm = Timer.Alarm(handler=handler, us=t_us)
else:
ack_error = TX_ERR_TOO_LATE
self._log('Downlink timestamp error!, t_us: {}', t_us)
self._ack_pull_rsp(_token, ack_error)
self._log("Pull rsp")
except usocket.timeout:
pass
except OSError as ex:
if ex.args[0] != errno.EAGAIN:
self._log('UDP recv OSError Exception: {}', ex)
except Exception as ex:
self._log('UDP recv Exception: {}', ex)
# we are to close the socket
self.sock.close()
self.udp_stop = False
self._log('UDP thread stopped')
def _log(self, message, *args):
"""
Outputs a log message to stdout.
"""
if len(args)==0:
print('[{}] '.format(utime.ticks_cpu()) + str(message))
else:
print('[{}] {}'.format(
utime.ticks_cpu(),
str(message).format(*args)
))
class NanoGateway:
def __init__(self,
id,
frequency,
datarate,
ssid,
password,
server,
port,
ntp='pool.ntp.org',
ntp_period=3600):
self.id = id
self.frequency = frequency
self.datarate = datarate
self.sf = self._dr_to_sf(datarate)
self.ssid = ssid
self.password = password
self.server = server
self.port = port
self.ntp = ntp
self.ntp_period = ntp_period
self.rtc = machine.RTC()
self.rxnb = 0
self.rxok = 0
self.rxfw = 0
self.dwnb = 0
self.txnb = 0
self.stat_alarm = None
self.pull_alarm = None
self.uplink_alarm = None
self.udp_stop = False
self.udp_lock = _thread.allocate_lock()
self.lora = None
self.lora_sock = None
def start(self):
# setup WiFi as a station and connect
self.wlan = WLAN(mode=WLAN.STA)
self._connect_to_wifi()
# get a time sync
self.rtc.ntp_sync(self.ntp, update_period=self.ntp_period)
while not self.rtc.synced():
time.sleep_ms(50)
print("RTC NTP sync complete")
# get the server IP and create an UDP socket
self.server_ip = socket.getaddrinfo(self.server, self.port)[0][-1]
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
socket.IPPROTO_UDP)
self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.sock.setblocking(False)
# push the first time immediatelly
self._push_data(self._make_stat_packet())
# create the alarms
self.stat_alarm = Timer.Alarm(
handler=lambda t: self._push_data(self._make_stat_packet()),
s=60,
periodic=True)
self.pull_alarm = Timer.Alarm(handler=lambda u: self._pull_data(),
s=25,
periodic=True)
# start the UDP receive thread
self.udp_stop = False
_thread.start_new_thread(self._udp_thread, ())
# initialize the LoRa radio in LORA mode
self.lora = LoRa(mode=LoRa.LORA,
frequency=self.frequency,
bandwidth=LoRa.BW_125KHZ,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
# create a raw LoRa socket
self.lora_sock = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
self.lora_sock.setblocking(False)
self.lora_tx_done = False
self.lora.callback(trigger=(LoRa.RX_PACKET_EVENT
| LoRa.TX_PACKET_EVENT),
handler=self._lora_cb)
def stop(self):
# send the LoRa radio to sleep, stop the NTP sync, cancel the alarms and kill the UDP thread
self.lora.callback(trigger=None, handler=None)
self.lora.power_mode(LoRa.SLEEP)
self.rtc.ntp_sync(None)
self.stat_alarm.cancel()
self.pull_alarm.cancel()
self.udp_stop = True
while self.udp_stop:
time.sleep_ms(50)
# disable WLAN
self.wlan.disconnect()
self.wlan.deinit()
def _connect_to_wifi(self):
self.wlan.connect(self.ssid, auth=(None, self.password))
while not self.wlan.isconnected():
time.sleep_ms(50)
print("WiFi connected")
def _dr_to_sf(self, dr):
sf = dr[2:4]
if sf[1] not in '0123456789':
sf = sf[:1]
return int(sf)
def _sf_to_dr(self, sf):
return self.datarate
def _make_stat_packet(self):
now = self.rtc.now()
STAT_PK["stat"]["time"] = "%d-%02d-%02d %02d:%02d:%02d GMT" % (
now[0], now[1], now[2], now[3], now[4], now[5])
STAT_PK["stat"]["rxnb"] = self.rxnb
STAT_PK["stat"]["rxok"] = self.rxok
STAT_PK["stat"]["rxfw"] = self.rxfw
STAT_PK["stat"]["dwnb"] = self.dwnb
STAT_PK["stat"]["txnb"] = self.txnb
return json.dumps(STAT_PK)
def _make_node_packet(self, rx_data, rx_time, tmst, sf, rssi, snr):
RX_PK["rxpk"][0]["time"] = "%d-%02d-%02dT%02d:%02d:%02d.%dZ" % (
rx_time[0], rx_time[1], rx_time[2], rx_time[3], rx_time[4],
rx_time[5], rx_time[6])
RX_PK["rxpk"][0]["tmst"] = tmst
RX_PK["rxpk"][0]["datr"] = self._sf_to_dr(sf)
RX_PK["rxpk"][0]["rssi"] = rssi
RX_PK["rxpk"][0]["lsnr"] = float(snr)
RX_PK["rxpk"][0]["data"] = binascii.b2a_base64(rx_data)[:-1]
RX_PK["rxpk"][0]["size"] = len(rx_data)
return json.dumps(RX_PK)
def _push_data(self, data):
token = os.urandom(2)
packet = bytes([PROTOCOL_VERSION]) + token + bytes(
[PUSH_DATA]) + binascii.unhexlify(self.id) + data
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception:
print("PUSH exception")
def _pull_data(self):
token = os.urandom(2)
packet = bytes([PROTOCOL_VERSION]) + token + bytes(
[PULL_DATA]) + binascii.unhexlify(self.id)
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception:
print("PULL exception")
def _ack_pull_rsp(self, token, error):
TX_ACK_PK["txpk_ack"]["error"] = error
resp = json.dumps(TX_ACK_PK)
packet = bytes([PROTOCOL_VERSION]) + token + bytes(
[PULL_ACK]) + binascii.unhexlify(self.id) + resp
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception:
print("PULL RSP ACK exception")
def _lora_cb(self, lora):
events = lora.events()
if events & LoRa.RX_PACKET_EVENT:
self.rxnb += 1
self.rxok += 1
rx_data = self.lora_sock.recv(256)
stats = lora.stats()
self._push_data(
self._make_node_packet(rx_data, self.rtc.now(),
stats.rx_timestamp, stats.sfrx,
stats.rssi, stats.snr))
self.rxfw += 1
if events & LoRa.TX_PACKET_EVENT:
self.txnb += 1
lora.init(mode=LoRa.LORA,
frequency=self.frequency,
bandwidth=LoRa.BW_125KHZ,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
def _send_down_link(self, data, tmst, datarate, frequency):
self.lora.init(mode=LoRa.LORA,
frequency=frequency,
bandwidth=LoRa.BW_125KHZ,
sf=self._dr_to_sf(datarate),
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
while time.ticks_us() < tmst:
pass
self.lora_sock.send(data)
def _udp_thread(self):
while not self.udp_stop:
try:
data, src = self.sock.recvfrom(1024)
_token = data[1:3]
_type = data[3]
if _type == PUSH_ACK:
print("Push ack")
elif _type == PULL_ACK:
print("Pull ack")
elif _type == PULL_RESP:
self.dwnb += 1
ack_error = TX_ERR_NONE
tx_pk = json.loads(data[4:])
tmst = tx_pk["txpk"]["tmst"]
t_us = tmst - time.ticks_us() - 12500
if t_us < 0:
t_us += 0xFFFFFFFF
if t_us < 20000000:
self.uplink_alarm = Timer.Alarm(
handler=lambda x: self._send_down_link(
binascii.a2b_base64(tx_pk["txpk"]["data"]),
tx_pk["txpk"]["tmst"] - 50, tx_pk["txpk"][
"datr"],
int(tx_pk["txpk"]["freq"] * 1000000)),
us=t_us)
else:
ack_error = TX_ERR_TOO_LATE
print("Downlink timestamp error!, t_us:", t_us)
self._ack_pull_rsp(_token, ack_error)
print("Pull rsp")
except socket.timeout:
pass
except OSError as e:
if e.errno == errno.EAGAIN:
pass
else:
print("UDP recv OSError Exception")
except Exception:
print("UDP recv Exception")
# wait before trying to receive again
time.sleep(0.025)
# we are to close the socket
self.sock.close()
self.udp_stop = False
# if mac > 10:
# pymesh.end_device(True)
# if mac == 20:
# pymesh.leader_priority(255)
# elif mac == 15:
# pymesh.leader_priority(250)
while not pymesh.is_connected():
print(pymesh.status_str())
time.sleep(3)
print("Current available memory after pymesh load: %d" % gc.mem_free())
gc.collect()
wlan = WLAN()
wlan.deinit()
wlan = WLAN(mode=WLAN.AP,
ssid=node.node_ssid,
auth=(WLAN.WPA2, node.node_pass),
channel=11,
antenna=WLAN.INT_ANT)
wlan.ifconfig(id=1,
config=('192.168.1.1', '255.255.255.0', '192.168.1.1',
'8.8.8.8'))
print("====================================================================")
print("AP setting up")
node.first_time_set()
from network import WLAN w = WLAN() w.deinit() ##Switch Off WLAN
class NanoGateway:
"""
Nano gateway class, set up by default for use with TTN, but can be configured
for any other network supporting the Semtech Packet Forwarder.
Only required configuration is wifi_ssid and wifi_password which are used for
connecting to the Internet.
"""
def __init__(self, id, frequency, datarate, ssid, password, server, port, ntp_server='pool.ntp.org', ntp_period=3600):
self.id = id
self.server = server
self.port = port
self.frequency = frequency
self.datarate = datarate
self.ssid = ssid
self.password = password
self.ntp_server = ntp_server
self.ntp_period = ntp_period
self.server_ip = None
self.rxnb = 0
self.rxok = 0
self.rxfw = 0
self.dwnb = 0
self.txnb = 0
self.sf = self._dr_to_sf(self.datarate)
self.bw = self._dr_to_bw(self.datarate)
self.stat_alarm = None
self.pull_alarm = None
self.uplink_alarm = None
self.wlan = None
self.sock = None
self.udp_stop = False
self.udp_lock = _thread.allocate_lock()
self.lora = None
self.lora_sock = None
self.rtc = machine.RTC()
def start(self):
"""
Starts the LoRaWAN nano gateway.
"""
self._log('Starting LoRaWAN nano gateway with id: {}', self.id)
# setup WiFi as a station and connect
self.wlan = WLAN(mode=WLAN.STA)
self._connect_to_wifi()
# get a time sync
self._log('Syncing time with {} ...', self.ntp_server)
self.rtc.ntp_sync(self.ntp_server, update_period=self.ntp_period)
while not self.rtc.synced():
utime.sleep_ms(50)
self._log("RTC NTP sync complete")
# get the server IP and create an UDP socket
self.server_ip = usocket.getaddrinfo(self.server, self.port)[0][-1]
self._log('Opening UDP socket to {} ({}) port {}...', self.server, self.server_ip[0], self.server_ip[1])
self.sock = usocket.socket(usocket.AF_INET, usocket.SOCK_DGRAM, usocket.IPPROTO_UDP)
self.sock.setsockopt(usocket.SOL_SOCKET, usocket.SO_REUSEADDR, 1)
self.sock.setblocking(False)
# push the first time immediatelly
self._push_data(self._make_stat_packet())
# create the alarms
self.stat_alarm = Timer.Alarm(handler=lambda t: self._push_data(self._make_stat_packet()), s=60, periodic=True)
self.pull_alarm = Timer.Alarm(handler=lambda u: self._pull_data(), s=25, periodic=True)
# start the UDP receive thread
self.udp_stop = False
_thread.start_new_thread(self._udp_thread, ())
# initialize the LoRa radio in LORA mode
self._log('Setting up the LoRa radio at {:.1f} Mhz using {}', self._freq_to_float(self.frequency), self.datarate)
self.lora = LoRa(
mode=LoRa.LORA,
frequency=self.frequency,
bandwidth=self.bw,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True
)
# create a raw LoRa socket
self.lora_sock = usocket.socket(usocket.AF_LORA, usocket.SOCK_RAW)
self.lora_sock.setblocking(False)
self.lora_tx_done = False
self.lora.callback(trigger=(LoRa.RX_PACKET_EVENT | LoRa.TX_PACKET_EVENT), handler=self._lora_cb)
self._log('LoRaWAN nano gateway online')
def stop(self):
"""
Stops the LoRaWAN nano gateway.
"""
self._log('Stopping...')
# send the LoRa radio to sleep
self.lora.callback(trigger=None, handler=None)
self.lora.power_mode(LoRa.SLEEP)
# stop the NTP sync
self.rtc.ntp_sync(None)
# cancel all the alarms
self.stat_alarm.cancel()
self.pull_alarm.cancel()
# signal the UDP thread to stop
self.udp_stop = True
while self.udp_stop:
utime.sleep_ms(50)
# disable WLAN
self.wlan.disconnect()
self.wlan.deinit()
def _connect_to_wifi(self):
self.wlan.connect(self.ssid, auth=(None, self.password))
while not self.wlan.isconnected():
utime.sleep_ms(50)
self._log('WiFi connected to: {}', self.ssid)
def _dr_to_sf(self, dr):
sf = dr[2:4]
if sf[1] not in '0123456789':
sf = sf[:1]
return int(sf)
def _dr_to_bw(self, dr):
bw = dr[-5:]
if bw == 'BW125':
return LoRa.BW_125KHZ
elif bw == 'BW250':
return LoRa.BW_250KHZ
else:
return LoRa.BW_500KHZ
def _sf_bw_to_dr(self, sf, bw):
dr = 'SF' + str(sf)
if bw == LoRa.BW_125KHZ:
return dr + 'BW125'
elif bw == LoRa.BW_250KHZ:
return dr + 'BW250'
else:
return dr + 'BW500'
def _lora_cb(self, lora):
"""
LoRa radio events callback handler.
"""
events = lora.events()
if events & LoRa.RX_PACKET_EVENT:
self.rxnb += 1
self.rxok += 1
rx_data = self.lora_sock.recv(256)
stats = lora.stats()
packet = self._make_node_packet(rx_data, self.rtc.now(), stats.rx_timestamp, stats.sfrx, self.bw, stats.rssi, stats.snr)
self._push_data(packet)
self._log('Received packet: {}', packet)
self.rxfw += 1
if events & LoRa.TX_PACKET_EVENT:
self.txnb += 1
lora.init(
mode=LoRa.LORA,
frequency=self.frequency,
bandwidth=self.bw,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True
)
def _freq_to_float(self, frequency):
"""
MicroPython has some inprecision when doing large float division.
To counter this, this method first does integer division until we
reach the decimal breaking point. This doesn't completely elimate
the issue in all cases, but it does help for a number of commonly
used frequencies.
"""
divider = 6
while divider > 0 and frequency % 10 == 0:
frequency = frequency // 10
divider -= 1
if divider > 0:
frequency = frequency / (10 ** divider)
return frequency
def _make_stat_packet(self):
now = self.rtc.now()
STAT_PK["stat"]["time"] = "%d-%02d-%02d %02d:%02d:%02d GMT" % (now[0], now[1], now[2], now[3], now[4], now[5])
STAT_PK["stat"]["rxnb"] = self.rxnb
STAT_PK["stat"]["rxok"] = self.rxok
STAT_PK["stat"]["rxfw"] = self.rxfw
STAT_PK["stat"]["dwnb"] = self.dwnb
STAT_PK["stat"]["txnb"] = self.txnb
return ujson.dumps(STAT_PK)
def _make_node_packet(self, rx_data, rx_time, tmst, sf, bw, rssi, snr):
RX_PK["rxpk"][0]["time"] = "%d-%02d-%02dT%02d:%02d:%02d.%dZ" % (rx_time[0], rx_time[1], rx_time[2], rx_time[3], rx_time[4], rx_time[5], rx_time[6])
RX_PK["rxpk"][0]["tmst"] = tmst
RX_PK["rxpk"][0]["freq"] = self._freq_to_float(self.frequency)
RX_PK["rxpk"][0]["datr"] = self._sf_bw_to_dr(sf, bw)
RX_PK["rxpk"][0]["rssi"] = rssi
RX_PK["rxpk"][0]["lsnr"] = snr
RX_PK["rxpk"][0]["data"] = ubinascii.b2a_base64(rx_data)[:-1]
RX_PK["rxpk"][0]["size"] = len(rx_data)
return ujson.dumps(RX_PK)
def _push_data(self, data):
token = uos.urandom(2)
packet = bytes([PROTOCOL_VERSION]) + token + bytes([PUSH_DATA]) + ubinascii.unhexlify(self.id) + data
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('Failed to push uplink packet to server: {}', ex)
def _pull_data(self):
token = uos.urandom(2)
packet = bytes([PROTOCOL_VERSION]) + token + bytes([PULL_DATA]) + ubinascii.unhexlify(self.id)
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('Failed to pull downlink packets from server: {}', ex)
def _ack_pull_rsp(self, token, error):
TX_ACK_PK["txpk_ack"]["error"] = error
resp = ujson.dumps(TX_ACK_PK)
packet = bytes([PROTOCOL_VERSION]) + token + bytes([PULL_ACK]) + ubinascii.unhexlify(self.id) + resp
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('PULL RSP ACK exception: {}', ex)
def _send_down_link(self, data, tmst, datarate, frequency):
"""
Transmits a downlink message over LoRa.
"""
self.lora.init(
mode=LoRa.LORA,
frequency=frequency,
bandwidth=self._dr_to_bw(datarate),
sf=self._dr_to_sf(datarate),
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True
)
while utime.ticks_us() < tmst:
pass
self.lora_sock.send(data)
self._log(
'Sent downlink packet scheduled on {:.3f}, at {:.1f} Mhz using {}: {}',
tmst / 1000000,
self._freq_to_float(frequency),
datarate,
data
)
def _udp_thread(self):
"""
UDP thread, reads data from the server and handles it.
"""
while not self.udp_stop:
try:
data, src = self.sock.recvfrom(1024)
_token = data[1:3]
_type = data[3]
if _type == PUSH_ACK:
self._log("Push ack")
elif _type == PULL_ACK:
self._log("Pull ack")
elif _type == PULL_RESP:
self.dwnb += 1
ack_error = TX_ERR_NONE
tx_pk = ujson.loads(data[4:])
tmst = tx_pk["txpk"]["tmst"]
t_us = tmst - utime.ticks_us() - 12500
if t_us < 0:
t_us += 0xFFFFFFFF
if t_us < 20000000:
self.uplink_alarm = Timer.Alarm(
handler=lambda x: self._send_down_link(
ubinascii.a2b_base64(tx_pk["txpk"]["data"]),
tx_pk["txpk"]["tmst"] - 50, tx_pk["txpk"]["datr"],
int(tx_pk["txpk"]["freq"] * 1000000)
),
us=t_us
)
else:
ack_error = TX_ERR_TOO_LATE
self._log('Downlink timestamp error!, t_us: {}', t_us)
self._ack_pull_rsp(_token, ack_error)
self._log("Pull rsp")
except usocket.timeout:
pass
except OSError as ex:
if ex.errno != errno.EAGAIN:
self._log('UDP recv OSError Exception: {}', ex)
except Exception as ex:
self._log('UDP recv Exception: {}', ex)
# wait before trying to receive again
utime.sleep_ms(UDP_THREAD_CYCLE_MS)
# we are to close the socket
self.sock.close()
self.udp_stop = False
self._log('UDP thread stopped')
def _log(self, message, *args):
"""
Outputs a log message to stdout.
"""
print('[{:>10.3f}] {}'.format(
utime.ticks_ms() / 1000,
str(message).format(*args)
))
import pycom
import machine
from machine import Pin
pycom.heartbeat(False)
from network import WLAN
from network import Bluetooth
import os
pycom.wifi_on_boot(False)
wlan = WLAN() # Instantiates WLAN
wlan.deinit() # Turns off wifi
bluetooth = Bluetooth() # Instantiates Bluetooth
bluetooth.deinit() # Turns off Bluetooth
counter = pycom.nvs_get('count') # Get ID value from memory
if type(counter) != int: # If the value is not in memory
pycom.nvs_set('count', 0) # ID = 0
class WiFiManager:
def __init__(self, manager, settings):
self.manager = manager
self.settings = settings
# WIFI settings.
self.stations = self.settings.get('networking.wifi.stations')
self.station = None
def start(self):
"""
https://docs.pycom.io/tutorials/all/wlan.html
https://github.com/pycom/pydocs/blob/master/firmwareapi/pycom/network/wlan.md
"""
# Todo: Propagate more parameters here, e.g. for using an external antenna.
self.station = WLAN()
#if machine.reset_cause() == machine.SOFT_RESET:
# print("WiFi STA: Network connection after SOFT_RESET.")
# self.print_short_status()
# # Inform about networking status.
# self.print_address_status()
# return True
# Save the default ssid and auth for restoring AP mode later
original_ssid = self.station.ssid()
original_auth = self.station.auth()
# Inform about networking status.
self.print_address_status()
# Setup network interface.
self.station.init()
# Check WiFi connectivity.
if self.station.isconnected():
log.info(
"WiFi STA: Network connection already established, will skip scanning and resume connectivity."
)
self.print_short_status()
# Give system some breath.
time.sleep(0.25)
# Inform about networking status.
self.print_address_status()
return True
# Prepare information about known WiFi networks.
networks_known = frozenset(
[station['ssid'] for station in self.stations])
log.info("WiFi STA: Starting interface")
self.station.mode(WLAN.STA)
# Attempt to connect to known/configured networks.
log.info("WiFi STA: Directly connecting to configured networks: %s",
list(networks_known))
try:
self.connect_stations(networks_known)
except:
log.warning('WiFi: Switching to AP mode not implemented yet')
# Todo: Reenable WiFi AP mode in the context of an "initial configuration" mode.
"""
log.info('WiFi: Switching to AP mode')
# WLAN.AP, original_ssid, original_auth, WLAN.INT_ANT
# TOOD: Make default channel configurable
self.station.init(mode=WLAN.AP, ssid=original_ssid, auth=original_auth, channel=6, antenna=WLAN.INT_ANT)
"""
def power_off(self):
"""
Power off all radio peripherals.
- https://forum.pycom.io/topic/563/disabling-wifi-on-lopy
- https://github.com/Hiverize/FiPy/commit/b6b15677
"""
# WiFi
if self.station:
try:
log.info('Turning off WiFi')
self.station.deinit()
except:
log.exception('Turning off WiFi failed')
def connect_stations(self, network_names):
# Prepare information about known WiFi networks.
network_map = {station['ssid']: station for station in self.stations}
for network_name in network_names:
try:
# All the configuration details for this network.
# {
# 'ssid': 'FooBar',
# 'password': '******',
# 'ifconfig': ('192.168.42.42', '255.255.255.0', '192.168.42.1', '192.168.42.1'),
# }
network_selected = network_map[network_name]
if self.connect_station(network_selected):
break
except Exception:
log.exception(
'WiFi STA: Connecting to "{}" failed'.format(network_name))
if not self.station.isconnected():
self.forget_network(network_name)
message = 'WiFi STA: Connecting to any network candidate failed'
description = 'Please check your WiFi configuration for one of the ' \
'station candidates {}.'.format(len(network_names))
log.error('{}. {}'.format(message, description))
log.warning(
'Todo: We might want to switch to AP mode here or alternatively '
'buffer telemetry data to flash to be scheduled for transmission later.'
)
raise WiFiException(message)
def connect_station(self, network):
network_name = network['ssid']
log.info('WiFi STA: Prepare connecting to network "{}"'.format(
network_name))
auth_mode = self.get_auth_mode(network_name)
log.info(
'WiFi STA: Attempt connecting to network "{}" with auth mode "{}"'.
format(network_name, auth_mode))
password = network['password']
# TODO: Optionally, configure hostname.
# https://docs.micropython.org/en/latest/library/network.WLAN.html
# https://github.com/pycom/pycom-micropython-sigfox/pull/165
# https://forum.pycom.io/topic/3326/new-firmware-release-v1-18-0
if 'dhcp_hostname' in network:
if hasattr(self.station, 'config'):
log.ingo('WiFi STA: Using dhcp_hostname "{}"'.format(
network['dhcp_hostname']))
self.station.config(dhcp_hostname=network['dhcp_hostname'])
else:
log.error('Could not set hostname on older MicroPython')
# Optionally, configure static IP address.
if 'ifconfig' in network:
log.info(
'WiFi STA: Using static network configuration "{}"'.format(
network_name))
self.station.ifconfig(config=network['ifconfig'])
# Obtain timeout value.
network_timeout = network.get('timeout', 15.0)
# Set interval how often to poll for WiFi connectivity.
network_poll_interval = 800
# Connect to WiFi station.
log.info(
'WiFi STA: Starting connection to "{}" with timeout of {} seconds'.
format(network_name, network_timeout))
self.station.connect(network_name, (auth_mode, password),
timeout=int(network_timeout * 1000))
# Wait for station network to arrive.
# ``isconnected()`` returns True when connected to a WiFi access point *and* having a valid IP address.
retries = int(network_timeout * network_poll_interval)
while not self.station.isconnected() and retries > 0:
log.info(
'WiFi STA: Waiting for network "{}".'.format(network_name))
retries -= 1
# Save power while waiting.
machine.idle()
# Feed watchdog.
self.manager.device.feed_watchdog()
# Don't busy-wait.
time.sleep_ms(network_poll_interval)
if not self.station.isconnected():
raise WiFiException(
'WiFi STA: Unable to connect to "{}"'.format(network_name))
# Inform about networking status.
self.print_short_status()
self.print_address_status()
return True
def scan_stations(self):
self.manager.device.feed_watchdog()
# Inquire visible networks.
log.info("WiFi STA: Scanning for networks")
stations_available = self.station.scan()
networks_found = frozenset([e.ssid for e in stations_available])
# Print names/SSIDs of networks found.
log.info("WiFi STA: Networks available: %s", list(networks_found))
return stations_available
# Compute set of effective networks by intersecting known with found ones.
#network_candidates = list(networks_found & networks_known)
#log.info("WiFi STA: Network candidates: %s", network_candidates)
def get_ssid(self):
return self.station.ssid()
def get_ip_address(self):
try:
return self.station.ifconfig()[0]
except:
pass
def get_auth_mode(self, network_name):
# NVRAM key for storing auth mode per network. Maximum of 15 characters.
auth_mode_nvs_key = self.auth_mode_nvs_key(network_name)
# Get WiFi STA auth mode from NVRAM.
try:
import pycom
auth_mode = pycom.nvs_get(auth_mode_nvs_key)
log.info('WiFi STA: Auth mode from NVRAM with key=%s, value=%s',
auth_mode_nvs_key, auth_mode)
except:
auth_mode = None
# Fall back to find out WiFi STA auth mode by network scan.
if auth_mode is None:
log.info(
'WiFi STA: Unknown auth mode for network "%s", invoking WiFi scan',
network_name)
wifi_neighbourhood = self.scan_stations()
#log.info('WiFi STA: Neighbourhood is %s', wifi_neighbourhood)
for e in wifi_neighbourhood:
if e.ssid == network_name:
auth_mode = e.sec
break
if not auth_mode:
message = 'WiFi STA: Unable to inquire auth mode for network "{}"'.format(
network_name)
log.warning(message)
raise WiFiException(message)
log.info(
'WiFi STA: Storing auth mode into NVRAM with key=%s, value=%s',
auth_mode_nvs_key, auth_mode)
try:
import pycom
pycom.nvs_set(auth_mode_nvs_key, auth_mode)
except:
log.exception('WiFi STA: Storing auth mode into NVRAM failed')
return auth_mode
def auth_mode_nvs_key(self, ssid):
"""
Hack to get a short representation of a WiFi SSID in order to
squeeze it into a NVRAM key with a maximum length of 15 characters.
Fixme: Review this.
"""
import hashlib
import ubinascii
digest = ubinascii.hexlify(hashlib.sha512(ssid).digest()).decode()
identifier = 'wa.{}'.format(digest[15:27])
return identifier
def forget_network(self, network_name):
log.info('WiFi STA: Forgetting NVRAM data for network "{}"'.format(
network_name))
auth_mode_nvs_key = self.auth_mode_nvs_key(network_name)
try:
import pycom
pycom.nvs_erase(auth_mode_nvs_key)
except:
pass
def print_short_status(self):
log.info('WiFi STA: Connected to "{}" with IP address "{}"'.format(
self.get_ssid(), self.get_ip_address()))
def print_address_status(self):
mac_address = self.humanize_mac_addresses(self.station.mac())
ifconfig = self.station.ifconfig()
log.info('WiFi STA: Networking address (MAC): %s', mac_address)
log.info('WiFi STA: Networking address (IP): %s', ifconfig)
def humanize_mac_addresses(self, mac):
info = {}
if hasattr(mac, 'sta_mac'):
info['sta_mac'] = format_mac_address(
binascii.hexlify(mac.sta_mac).decode())
if hasattr(mac, 'ap_mac'):
info['ap_mac'] = format_mac_address(
binascii.hexlify(mac.ap_mac).decode())
return info
def print_metrics(self):
metrics = SystemWiFiMetrics(self.station).read()
log.info('WiFi STA: Metrics: %s', metrics)
time.sleep_ms(5000)
tft.fill(TFT.BLACK)
print("Sleep: ")
v = 0
fft_print = "Enter Sleep"
tft.text((0, v), fft_print, TFT.WHITE, sysfont, 1)
time.sleep_ms(1000)
#======================================
# Garbage Collector
#======================================
gc.collect()
gc.mem_free()
#sigfox = Sigfox(mode=Sigfox.SIGFOX, rcz=Sigfox.RCZ1)
#sigfox.deinit()
#bt = Bluetooth()
#bt.deinit()
w = WLAN()
w.deinit()
lte = LTE()
lte.deinit()
time_ms = 60000
machine.deepsleep(time_ms)
lora.power_mode(LoRa.SLEEP)
random_sleep(10)
pycom.rgbled(off)
### MAIN ###
MY_ID = 0x00 # to be filled in get_id
pycom.heartbeat(False)
get_id()
bt = Bluetooth()
bt.deinit()
server = Server()
server.deinit()
wlan = WLAN(mode=WLAN.STA)
wlan.deinit() # remove these two lines if you activate OTA
pybytes.smart_config(False) # disable provisioning
# py = Pytrack()
# ANSELC_ADDR = const(0x18E)
# py.poke_memory(ANSELC_ADDR, ~(1 << 7))
_LORA_PKG_FORMAT = "!BB%ds"
_LORA_RCV_PKG_FORMAT = "!BB%ds"
(my_sf, my_bw_index, my_bw_plain, guard, my_slot, packet_size) = (7, 0, 0, 15000, -1, 16) # default values
index = 0
S = 1000
active_rx = 0.0
active_tx = 0.0
proc_gw = 4000 # gw default (minimum) processing time (us)
(sack_rcv, sack_bytes) = (0, 0) # will be filled later
msg = crypto.getrandbits(packet_size*8) # just a random packet
class MicroWifi:
# ============================================================================
# ===( Constants )============================================================
# ============================================================================
_ETH_AP = 1
_ETH_STA = 0
_IP_NONE = '0.0.0.0'
_DEFAULT_AUTH_TYPE = WLAN.WPA2
_AP_MASK = '255.255.255.0'
_DEFAULT_TIMEOUT_SEC = 10
# ============================================================================
# ===( Utils )===============================================================
# ============================================================================
@staticmethod
def _mac2Str(binMac):
return hexlify(binMac, ':').decode().upper()
# ----------------------------------------------------------------------------
def _setAPInfos(self,
ssid=None,
key=None,
ip=None,
mask=None,
gateway=None,
dns=None):
self._apInfos = {
'ssid': ssid,
'key': key,
'ip': ip,
'mask': mask,
'gateway': gateway,
'dns': dns
}
# ----------------------------------------------------------------------------
def _setConnectionInfos(self,
bssid=None,
ssid=None,
key=None,
ip=None,
mask=None,
gateway=None,
dns=None):
self._connInfos = {
'macBssid': bssid,
'ssid': ssid,
'key': key,
'ip': ip,
'mask': mask,
'gateway': gateway,
'dns': dns
}
# ----------------------------------------------------------------------------
def _openConf(self):
try:
with open(self._filePath, 'r') as jsonFile:
self._confObj = load(jsonFile)
except:
self._confObj = {}
if self._confObj.get('STA', None) is None:
self._confObj['STA'] = {}
# ----------------------------------------------------------------------------
def _writeConf(self):
try:
jsonStr = dumps(self._confObj)
try:
mkdir(self._confPath)
except:
pass
jsonFile = open(self._filePath, 'wb')
jsonFile.write(jsonStr)
jsonFile.close()
return True
except:
return False
# ============================================================================
# ===( Constructor )==========================================================
# ============================================================================
def __init__(self,
confName="wifi",
confPath="/flash/conf",
useExtAntenna=False):
self._confPath = confPath
self._filePath = '%s/%s.json' % (confPath, confName)
self._wlan = WLAN()
self._antenna = WLAN.EXT_ANT if useExtAntenna else WLAN.INT_ANT
self._openConf()
self._setAPInfos()
self._setConnectionInfos()
self._wlan.init(antenna=self._antenna)
self.DisableRadio()
# ============================================================================
# ===( Functions )============================================================
# ============================================================================
def DisableRadio(self):
self.CloseAccessPoint()
self.CloseConnectionToAP()
self._wlan.deinit()
# ----------------------------------------------------------------------------
def GetMACAddr(self):
return self._mac2Str(self._wlan.mac())
# ----------------------------------------------------------------------------
def GetAPInfos(self):
if not self.IsAccessPointOpened():
self._setAPInfos()
return self._apInfos
# ----------------------------------------------------------------------------
def GetConnectionInfos(self):
if not self.IsConnectedToAP():
self._setConnectionInfos()
return self._connInfos
# ----------------------------------------------------------------------------
def ScanAP(self):
try:
if self._wlan.mode() == WLAN.STA:
self._wlan.init(antenna=self._antenna)
return self._wlan.scan()
except:
return ()
# ----------------------------------------------------------------------------
def OpenAccessPoint(self,
ssid,
key=None,
ip='192.168.0.254',
autoSave=True):
if ssid and ip:
try:
self._wlan.ifconfig(id=self._ETH_AP,
config=(ip, self._AP_MASK, ip, ip))
auth = (self._DEFAULT_AUTH_TYPE, key) if key else None
self._wlan.init(mode=WLAN.STA_AP,
ssid=ssid,
auth=auth,
antenna=self._antenna)
print("WIFI ACCESS POINT OPENED :")
print(" - MAC address : %s" % self.GetMACAddr())
print(" - Network SSID : %s" % ssid)
print(" - IP address : %s" % ip)
print(" - Mask : %s" % self._AP_MASK)
print(" - Gateway IP : %s" % ip)
print(" - DNS server : %s" % ip)
if autoSave:
self._confObj['AP'] = {'ssid': ssid, 'key': key, 'ip': ip}
self._writeConf()
self._setAPInfos(ssid, key, ip, self._AP_MASK, ip, ip)
return True
except:
self.CloseAccessPoint()
return False
# ----------------------------------------------------------------------------
def OpenAccessPointFromConf(self):
try:
ssid = self._confObj['AP']['ssid']
key = self._confObj['AP']['key']
ip = self._confObj['AP']['ip']
return self.OpenAccessPoint(ssid, key, ip, False)
except:
return False
# ----------------------------------------------------------------------------
def RemoveAccessPointFromConf(self):
try:
del self._confObj['AP']
return self._writeConf()
except:
return False
# ----------------------------------------------------------------------------
def CloseAccessPoint(self):
try:
ip = self._IP_NONE
self._wlan.mode(WLAN.STA)
self._wlan.ifconfig(id=self._ETH_AP, config=(ip, ip, ip, ip))
return True
except:
return False
# ----------------------------------------------------------------------------
def IsAccessPointOpened(self):
return self._wlan.ifconfig(self._ETH_AP)[0] != self._IP_NONE
# ----------------------------------------------------------------------------
def ConnectToAP(self,
ssid,
key=None,
macBssid=None,
timeoutSec=None,
autoSave=True):
if ssid:
if not key:
key = ''
if not timeoutSec:
timeoutSec = self._DEFAULT_TIMEOUT_SEC
timeout = timeoutSec * 1000
if self._wlan.mode() == WLAN.STA:
self._wlan.init(antenna=self._antenna)
print("TRYING TO CONNECT WIFI TO AP %s..." % ssid)
for ap in self.ScanAP():
if ap.ssid == ssid and \
( not macBssid or self._mac2Str(ap.bssid) == macBssid ) :
self._wlan.connect(ssid=ap.ssid,
bssid=ap.bssid,
auth=(self._DEFAULT_AUTH_TYPE, key),
timeout=timeout)
t = ticks_ms()
while ticks_diff(t, ticks_ms()) < timeout:
sleep(0.100)
if self.IsConnectedToAP():
bssid = self._mac2Str(ap.bssid)
staCfg = self._wlan.ifconfig(id=self._ETH_STA)
ip = staCfg[0]
mask = staCfg[1]
gateway = staCfg[2]
dns = staCfg[3]
print("WIFI CONNECTED TO AP :")
print(" - MAC address : %s" % self.GetMACAddr())
print(" - Network BSSID : %s" % bssid)
print(" - Network SSID : %s" % ssid)
print(" - IP address : %s" % ip)
print(" - Mask : %s" % mask)
print(" - Gateway IP : %s" % gateway)
print(" - DNS server : %s" % dns)
if autoSave:
sta = {
'ssid': ssid,
'key': key,
}
self._confObj['STA'][bssid] = sta
self._writeConf()
self._setConnectionInfos(bssid, ssid, key, ip,
mask, gateway, dns)
return True
self.CloseConnectionToAP()
break
print("FAILED TO CONNECT WIFI TO AP %s" % ssid)
return False
# ----------------------------------------------------------------------------
def ConnectToAPFromConf(self, bssidMustBeSame=False, timeoutSec=None):
if self._wlan.mode() == WLAN.STA:
self._wlan.init(antenna=self._antenna)
for ap in self.ScanAP():
for bssid in self._confObj['STA']:
macBssid = self._mac2Str(ap.bssid) if bssidMustBeSame else None
if self._confObj['STA'][bssid]['ssid'] == ap.ssid and \
( not macBssid or bssid == macBssid ) :
if self.ConnectToAP(ap.ssid,
self._confObj['STA'][bssid]['key'],
macBssid, timeoutSec, False):
return True
break
return False
# ----------------------------------------------------------------------------
def RemoveConnectionToAPFromConf(self, ssid, macBssid=None):
try:
changed = False
for bssid in list(self._confObj['STA']):
if self._confObj['STA'][bssid]['ssid'] == ssid and \
( not macBssid or bssid == macBssid ) :
del self._confObj['STA'][bssid]
changed = True
if changed:
return self._writeConf()
except:
pass
return False
# ----------------------------------------------------------------------------
def CloseConnectionToAP(self):
try:
self._wlan.disconnect()
self._wlan.ifconfig(id=self._ETH_STA, config='dhcp')
return True
except:
return False
# ----------------------------------------------------------------------------
def IsConnectedToAP(self):
return self._wlan.ifconfig(self._ETH_STA)[0] != self._IP_NONE
# ----------------------------------------------------------------------------
def ResolveIPFromHostname(self, hostname):
originalMode = self._wlan.mode()
if originalMode == WLAN.STA_AP:
self._wlan.mode(WLAN.STA)
try:
ipResolved = getaddrinfo(hostname, 0)[0][-1][0]
except:
ipResolved = None
if originalMode == WLAN.STA_AP:
self._wlan.mode(WLAN.STA_AP)
return ipResolved if ipResolved != self._IP_NONE else None
# ----------------------------------------------------------------------------
def InternetAccessIsPresent(self):
return (self.ResolveIPFromHostname('iana.org') is not None)
# ----------------------------------------------------------------------------
def WaitForInternetAccess(self, timeoutSec=None):
if not timeoutSec:
timeoutSec = self._DEFAULT_TIMEOUT_SEC
timeout = timeoutSec * 1000
t = ticks_ms()
while ticks_diff(t, ticks_ms()) < timeout:
sleep(0.100)
if self.InternetAccessIsPresent():
return True
return False
try:
sd = SD()
os.mount(sd, SD_MOUNT_DIR)
sd_en = True
rgb.green(0x88)
rgb.red(0x88)
time.sleep(1)
rgb.green_off()
rgb.red_off()
except OSError:
sd_en = False #Make sure SD card access is disabled
print("SD Card enabled: " + str(sd_en))
wlan = WLAN()
wlan.deinit() #Disable the WiFi access point
#Enable GPS here red on
rgb.red_on()
py = Pytrack()
gps = L76GNSS(py, timeout=config.GPS_TIMEOUT)
fix = False #Initially we don't have a fix
#Join Lora blue on
lora = LoRa(mode=LoRa.LORAWAN)
dev_addr = struct.unpack(">l", binascii.unhexlify(config.DEV_ADDR))[0]
nwk_swkey = binascii.unhexlify(config.NWS_KEY)
app_swkey = binascii.unhexlify(config.APPS_KEY)
lora.join(activation=LoRa.ABP, auth=(dev_addr, nwk_swkey, app_swkey))
prev_lat = 0
prev_lon = 0
class NanoGateway:
"""
Nano gateway class, set up by default for use with TTN, but can be configured
for any other network supporting the Semtech Packet Forwarder.
Only required configuration is wifi_ssid and wifi_password which are used for
connecting to the Internet.
"""
def __init__(self,
id,
frequency,
datarate,
ssid,
password,
server,
port,
ntp_server='pool.ntp.org',
ntp_period=3600):
self.id = id
self.server = server
self.port = port
self.frequency = frequency
self.datarate = datarate
self.ssid = ssid
self.password = password
self.ntp_server = ntp_server
self.ntp_period = ntp_period
self.server_ip = None
self.rxnb = 0
self.rxok = 0
self.rxfw = 0
self.dwnb = 0
self.txnb = 0
self.sf = self._dr_to_sf(self.datarate)
self.bw = self._dr_to_bw(self.datarate)
self.stat_alarm = None
self.pull_alarm = None
self.uplink_alarm = None
self.wlan = None
self.sock = None
self.udp_stop = False
self.udp_lock = _thread.allocate_lock()
self.lora = None
self.lora_sock = None
self.rtc = machine.RTC()
def start(self):
"""
Starts the LoRaWAN nano gateway.
"""
self._log('Starting LoRaWAN nano gateway with id: {}', self.id)
# setup WiFi as a station and connect
self.wlan = WLAN(mode=WLAN.STA)
self._connect_to_wifi()
# get a time sync
self._log('Syncing time with {} ...', self.ntp_server)
self.rtc.ntp_sync(self.ntp_server, update_period=self.ntp_period)
while not self.rtc.synced():
utime.sleep_ms(50)
self._log("RTC NTP sync complete")
# get the server IP and create an UDP socket
self.server_ip = usocket.getaddrinfo(self.server, self.port)[0][-1]
self._log('Opening UDP socket to {} ({}) port {}...', self.server,
self.server_ip[0], self.server_ip[1])
self.sock = usocket.socket(usocket.AF_INET, usocket.SOCK_DGRAM,
usocket.IPPROTO_UDP)
self.sock.setsockopt(usocket.SOL_SOCKET, usocket.SO_REUSEADDR, 1)
self.sock.setblocking(False)
# push the first time immediatelly
self._push_data(self._make_stat_packet())
# create the alarms
self.stat_alarm = Timer.Alarm(
handler=lambda t: self._push_data(self._make_stat_packet()),
s=60,
periodic=True)
self.pull_alarm = Timer.Alarm(handler=lambda u: self._pull_data(),
s=25,
periodic=True)
# start the UDP receive thread
self.udp_stop = False
_thread.start_new_thread(self._udp_thread, ())
# initialize the LoRa radio in LORA mode
self._log('Setting up the LoRa radio at {} Mhz using {}',
self._freq_to_float(self.frequency), self.datarate)
self.lora = LoRa(mode=LoRa.LORA,
frequency=self.frequency,
bandwidth=self.bw,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
# create a raw LoRa socket
self.lora_sock = usocket.socket(usocket.AF_LORA, usocket.SOCK_RAW)
self.lora_sock.setblocking(False)
self.lora_tx_done = False
self.lora.callback(trigger=(LoRa.RX_PACKET_EVENT
| LoRa.TX_PACKET_EVENT),
handler=self._lora_cb)
self._log('LoRaWAN nano gateway online')
def stop(self):
"""
Stops the LoRaWAN nano gateway.
"""
self._log('Stopping...')
# send the LoRa radio to sleep
self.lora.callback(trigger=None, handler=None)
self.lora.power_mode(LoRa.SLEEP)
# stop the NTP sync
self.rtc.ntp_sync(None)
# cancel all the alarms
self.stat_alarm.cancel()
self.pull_alarm.cancel()
# signal the UDP thread to stop
self.udp_stop = True
while self.udp_stop:
utime.sleep_ms(50)
# disable WLAN
self.wlan.disconnect()
self.wlan.deinit()
def _connect_to_wifi(self):
self.wlan.connect(self.ssid, auth=(None, self.password))
while not self.wlan.isconnected():
utime.sleep_ms(50)
self._log('WiFi connected to: {}', self.ssid)
def _dr_to_sf(self, dr):
sf = dr[2:4]
if sf[1] not in '0123456789':
sf = sf[:1]
return int(sf)
def _dr_to_bw(self, dr):
bw = dr[-5:]
if bw == 'BW125':
return LoRa.BW_125KHZ
elif bw == 'BW250':
return LoRa.BW_250KHZ
else:
return LoRa.BW_500KHZ
def _sf_bw_to_dr(self, sf, bw):
dr = 'SF' + str(sf)
if bw == LoRa.BW_125KHZ:
return dr + 'BW125'
elif bw == LoRa.BW_250KHZ:
return dr + 'BW250'
else:
return dr + 'BW500'
def _lora_cb(self, lora):
"""
LoRa radio events callback handler.
"""
events = lora.events()
if events & LoRa.RX_PACKET_EVENT:
self.rxnb += 1
self.rxok += 1
rx_data = self.lora_sock.recv(256)
stats = lora.stats()
packet = self._make_node_packet(rx_data, self.rtc.now(),
stats.rx_timestamp, stats.sfrx,
self.bw, stats.rssi, stats.snr)
self._push_data(packet)
self._log('Received packet: {}', packet)
self.rxfw += 1
if events & LoRa.TX_PACKET_EVENT:
self.txnb += 1
lora.init(mode=LoRa.LORA,
frequency=self.frequency,
bandwidth=self.bw,
sf=self.sf,
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
def _freq_to_float(self, frequency):
"""
MicroPython has some inprecision when doing large float division.
To counter this, this method first does integer division until we
reach the decimal breaking point. This doesn't completely elimate
the issue in all cases, but it does help for a number of commonly
used frequencies.
"""
divider = 6
while divider > 0 and frequency % 10 == 0:
frequency = frequency // 10
divider -= 1
if divider > 0:
frequency = frequency / (10**divider)
return frequency
def _make_stat_packet(self):
now = self.rtc.now()
STAT_PK["stat"]["time"] = "%d-%02d-%02d %02d:%02d:%02d GMT" % (
now[0], now[1], now[2], now[3], now[4], now[5])
STAT_PK["stat"]["rxnb"] = self.rxnb
STAT_PK["stat"]["rxok"] = self.rxok
STAT_PK["stat"]["rxfw"] = self.rxfw
STAT_PK["stat"]["dwnb"] = self.dwnb
STAT_PK["stat"]["txnb"] = self.txnb
return ujson.dumps(STAT_PK)
def _make_node_packet(self, rx_data, rx_time, tmst, sf, bw, rssi, snr):
RX_PK["rxpk"][0]["time"] = "%d-%02d-%02dT%02d:%02d:%02d.%dZ" % (
rx_time[0], rx_time[1], rx_time[2], rx_time[3], rx_time[4],
rx_time[5], rx_time[6])
RX_PK["rxpk"][0]["tmst"] = tmst
RX_PK["rxpk"][0]["freq"] = self._freq_to_float(self.frequency)
RX_PK["rxpk"][0]["datr"] = self._sf_bw_to_dr(sf, bw)
RX_PK["rxpk"][0]["rssi"] = rssi
RX_PK["rxpk"][0]["lsnr"] = snr
RX_PK["rxpk"][0]["data"] = ubinascii.b2a_base64(rx_data)[:-1]
RX_PK["rxpk"][0]["size"] = len(rx_data)
return ujson.dumps(RX_PK)
def _push_data(self, data):
token = uos.urandom(2)
packet = bytes([PROTOCOL_VERSION]) + token + bytes(
[PUSH_DATA]) + ubinascii.unhexlify(self.id) + data
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('Failed to push uplink packet to server: {}', ex)
def _pull_data(self):
token = uos.urandom(2)
packet = bytes([PROTOCOL_VERSION]) + token + bytes(
[PULL_DATA]) + ubinascii.unhexlify(self.id)
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('Failed to pull downlink packets from server: {}',
ex)
def _ack_pull_rsp(self, token, error):
TX_ACK_PK["txpk_ack"]["error"] = error
resp = ujson.dumps(TX_ACK_PK)
packet = bytes([PROTOCOL_VERSION]) + token + bytes(
[PULL_ACK]) + ubinascii.unhexlify(self.id) + resp
with self.udp_lock:
try:
self.sock.sendto(packet, self.server_ip)
except Exception as ex:
self._log('PULL RSP ACK exception: {}', ex)
def _send_down_link(self, data, tmst, datarate, frequency):
"""
Transmits a downlink message over LoRa.
"""
self.lora.init(mode=LoRa.LORA,
frequency=frequency,
bandwidth=self._dr_to_bw(datarate),
sf=self._dr_to_sf(datarate),
preamble=8,
coding_rate=LoRa.CODING_4_5,
tx_iq=True)
while utime.ticks_cpu() < tmst:
pass
self.lora_sock.send(data)
self._log(
'Sent downlink packet scheduled on {:.3f}, at {:.3f} Mhz using {}: {}',
tmst / 1000000, self._freq_to_float(frequency), datarate, data)
def _udp_thread(self):
"""
UDP thread, reads data from the server and handles it.
"""
while not self.udp_stop:
try:
data, src = self.sock.recvfrom(1024)
_token = data[1:3]
_type = data[3]
if _type == PUSH_ACK:
self._log("Push ack")
elif _type == PULL_ACK:
self._log("Pull ack")
elif _type == PULL_RESP:
self.dwnb += 1
ack_error = TX_ERR_NONE
tx_pk = ujson.loads(data[4:])
tmst = tx_pk["txpk"]["tmst"]
t_us = tmst - utime.ticks_cpu() - 15000
if t_us < 0:
t_us += 0xFFFFFFFF
if t_us < 20000000:
self.uplink_alarm = Timer.Alarm(
handler=lambda x: self._send_down_link(
ubinascii.a2b_base64(tx_pk["txpk"]["data"]),
tx_pk["txpk"]["tmst"] - 50, tx_pk["txpk"][
"datr"],
int(tx_pk["txpk"]["freq"] * 1000) * 1000),
us=t_us)
else:
ack_error = TX_ERR_TOO_LATE
self._log('Downlink timestamp error!, t_us: {}', t_us)
self._ack_pull_rsp(_token, ack_error)
self._log("Pull rsp")
except usocket.timeout:
pass
except OSError as ex:
if ex.errno != errno.EAGAIN:
self._log('UDP recv OSError Exception: {}', ex)
except Exception as ex:
self._log('UDP recv Exception: {}', ex)
# wait before trying to receive again
utime.sleep_ms(UDP_THREAD_CYCLE_MS)
# we are to close the socket
self.sock.close()
self.udp_stop = False
self._log('UDP thread stopped')
def _log(self, message, *args):
"""
Outputs a log message to stdout.
"""
print('[{:>10.3f}] {}'.format(utime.ticks_ms() / 1000,
str(message).format(*args)))
class WLANAgent:
def __init__(self, ap_config=None, sta_config=None):
self._wlan = None
self.networks = {}
self._sta_config = sta_config
self._ap_config = ap_config
def isActive(self):
return self._wlan != None
def isconnected(self):
return self._wlan.isconnected()
def activate_ap_mode(self, ssid, password):
if self._ap_config is None:
log('No config to init AP Mode.')
return
try:
ssid = self._ap_config['ssid']
password = self._ap_config['password']
except KeyError:
log('Need password or ssid to init Access Point.')
return
if self._wlan:
self._wlan.deinit()
self._wlan = None
self._wlan = WLAN(
mode=WLAN.AP,
ssid=ssid,
auth=(WLAN.WPA2, password),
)
def stop(self):
if self._wlan:
self._wlan.deinit()
self._wlan = None
def activate_sta_mode(self):
if self._sta_config is None:
log('No config to init STA Mode.')
return
try:
self.networks = self._sta_config['wifi_networks']
except KeyError:
log('Need networks to init Wifi Station.')
return
if self._wlan:
self._wlan.deinit()
self._wlan = None
self._wlan = WLAN(mode=WLAN.STA, )
self._wlan.ifconfig(config="dhcp")
self.connect_to_ap()
def connect_to_ap(self):
while not self._wlan.isconnected():
try:
if len(list(self.networks.items())) < 1:
raise Exception("Need networks to connect to Wifi AP.")
if self._wlan.mode() != WLAN.STA:
raise Exception(
"Must in Station Mode to connect to Wifi AP.")
existing_networks = self._wlan.scan()
log('Found {}. existing wlan networks.'.format(
len(existing_networks)))
for network in existing_networks:
(ssid, bssid, sec, channel, rssi) = network
log('Try to connect to network {}'.format(ssid))
if ssid in self.networks:
password = self.networks[ssid]
self._wlan.connect(ssid, auth=(WLAN.WPA2, password))
break
now = time()
while not self._wlan.isconnected():
if (time() - now > 10):
raise Exception(
'Failed to connect to wlan {}. Timeout.'.format(
self._wlan.ssid()))
sleep(0.3)
(ip, subnet_mask, gateway, DNS_server) = self._wlan.ifconfig()
log('Connect to wifi {}'.format(self._wlan.ssid()))
log('IP: {}'.format(ip))
except Exception as err:
log(err)
sleep(2)