def start(self):
"""Start the netserver.
Sets up scheduled tasks and start listening on the required
interfaces.
"""
log.info("Starting the server")
# Setup scheduled tasks
# 1. ADR Requests
self.task['processADRRequests'] = task.LoopingCall(
self._processADRRequests)
if self.config.adrenable:
self.task['processADRRequests'].start(self.config.adrcycletime)
# 2. Message cache
self.task['cleanMessageCache'] = task.LoopingCall(
self._cleanMessageCache)
self.task['cleanMessageCache'].start(
max(10, self.config.duplicateperiod * 2))
# 3. MAC Command queue
self.task['manageMACCommandQueue'] = task.LoopingCall(
self._manageMACCommandQueue)
if self.config.macqueueing:
self.task['manageMACCommandQueue'].start(
self.config.macqueuelimit / 2)
# Start the web server
log.info("Starting the web server")
self.webserver = WebServer(self)
try:
self.webserver.start()
except CannotListenError:
log.error("Error starting the web server: cannot listen.")
reactor.stop()
# Start server network interfaces:
# LoRa gateway interface
log.info("Starting the LoRaWAN interface")
self.lora = LoraWAN(self)
try:
self.lora.start()
except CannotListenError:
log.error("Error opening LoRa interface UDP port {port}",
port=self.config.port)
reactor.stop()
# Application interfaces
interfaceManager.start(self)
def setUp(self):
"""Test setup"""
Registry.getConfig = MagicMock(return_value=None)
# Get factory default configuration
with patch.object(Model, 'save', MagicMock()):
config = yield Config.loadFactoryDefaults()
self.server = NetServer(config)
self.server.lora = LoraWAN(self.server)
self.webserver = WebServer(self.server)
self.restapi = self.webserver.restapi
def test_txpkResponse(self):
self.server.lora = LoraWAN(self)
self.server.lora.addGateway(
Gateway(host='192.168.1.125', name='Test', enabled=True, power=26))
tmst = randrange(0, 4294967295)
rxpk = Rxpk(tmst=tmst,
chan=3,
freq=915.8,
datr='SF7BW125',
data="n/uSwM0LIED8X6QV0mJMjC6oc2HOWFpCfmTry",
size=54)
device = self._test_device()
device.rx = self.server.band.rxparams((rxpk.chan, rxpk.datr),
join=False)
gateway = self.server.lora.gateway(device.gw_addr)
expected = [
(True, device.rx[1]['freq'], device.rx[1]['datr']),
(True, device.rx[2]['freq'], device.rx[2]['datr']),
(tmst + 1000000, device.rx[1]['freq'], device.rx[1]['datr']),
(tmst + 2000000, device.rx[2]['freq'], device.rx[2]['datr'])
]
result = []
txpk = self.server._txpkResponse(device,
rxpk.data,
gateway,
tmst,
immediate=True)
for i in range(1, 3):
result.append((txpk[i].imme, txpk[i].freq, txpk[i].datr))
txpk = self.server._txpkResponse(device,
rxpk.data,
gateway,
tmst,
immediate=False)
for i in range(1, 3):
result.append((txpk[i].tmst, txpk[i].freq, txpk[i].datr))
self.assertEqual(expected, result)
class NetServer(object):
"""LoRa network server
Attributes:
config (Configuration): Configuration object
message_cache (list): Timestamped MICs used for de-duplication
otagrange (set): Collection set of OTA addresses
task (dict): Dictionary of scheduled tasks
commands (dict): Dictionary of queued downlink MAC Commands
adrprocessing (bool): ADR processing flag
band (Band): Frequency band object
"""
def __init__(self, config):
"""NetServer initialisation method.
Args:
database (Database): Database configuration object
"""
log.info("Initialising the server")
self.message_cache = []
self.task = {}
self.commands = []
self.adrprocessing = False
self.config = config
self.otarange = set(
xrange(self.config.otaastart, self.config.otaaend + 1))
self.band = eval(self.config.freqband)()
def reload(self, config):
"""Reload a new system configuration
Args:
config (Config): A validated system configuration
"""
def changed(*args):
for p in args:
if getattr(self.config, p) != getattr(config, p):
return True
return False
if changed('port', 'listen'):
try:
self.lora.restart()
except CannotListenError:
return (False, "Error restarting the LoraWAN server: "
"cannot listen.")
elif changed('webport'):
try:
self.webserver.restart()
except CannotListenError:
return (False, "Error restarting the web server: "
"cannot listen.")
elif changed('adrenable', 'adrcycletime'):
# if ADR is enabled, restart the task
if config.adrenable:
if self.task['processADRRequests'].running:
self.task['processADRRequests'].stop()
self.task['processADRRequests'].start(config.adrcycletime)
# If ADR processing is disabled, stop the task
else:
if self.task['processADRRequests'].running:
self.task['processADRRequests'].stop()
elif changed('otaastart', 'otaaend'):
self.otarange = set(xrange(config.otaastart, config.otaaend + 1))
elif changed('macqueueing', 'macqueuelimit'):
if config.macqueueing:
if self.task['manageMACCommandQueue'].running:
self.task['manageMACCommandQueue'].stop()
self.task['manageMACCommandQueue'].start(config.macqueuelimit /
2)
else:
if self.task['manageMACCommandQueue'].running:
self.task['manageMACCommandQueue'].stop()
elif changed('freqband'):
self.band = eval(config.freqband)()
self.config = config
return (True, '')
def start(self):
"""Start the netserver.
Sets up scheduled tasks and start listening on the required
interfaces.
"""
log.info("Starting the server")
# Setup scheduled tasks
# 1. ADR Requests
self.task['processADRRequests'] = task.LoopingCall(
self._processADRRequests)
if self.config.adrenable:
self.task['processADRRequests'].start(self.config.adrcycletime)
# 2. Message cache
self.task['cleanMessageCache'] = task.LoopingCall(
self._cleanMessageCache)
self.task['cleanMessageCache'].start(
max(10, self.config.duplicateperiod * 2))
# 3. MAC Command queue
self.task['manageMACCommandQueue'] = task.LoopingCall(
self._manageMACCommandQueue)
if self.config.macqueueing:
self.task['manageMACCommandQueue'].start(
self.config.macqueuelimit / 2)
# Start the web server
log.info("Starting the web server")
self.webserver = WebServer(self)
try:
self.webserver.start()
except CannotListenError:
log.error("Error starting the web server: cannot listen.")
reactor.stop()
# Start server network interfaces:
# LoRa gateway interface
log.info("Starting the LoRaWAN interface")
self.lora = LoraWAN(self)
try:
self.lora.start()
except CannotListenError:
log.error("Error opening LoRa interface UDP port {port}",
port=self.config.port)
reactor.stop()
# Application interfaces
interfaceManager.start(self)
def checkDevaddr(self, devaddr):
"""Check an address is within the configured network"""
x = devaddr >> 25
y = self.config.netid & 0x7F
return x == y
@inlineCallbacks
def _getOTAADevAddrs(self):
"""Get all devaddrs for currently assigned Over the Air Activation (OTAA) devices.
Returns:
A list of devaddrs.
"""
devices = yield Device.find(where=[
'devaddr >= ? AND devaddr <= ?', self.config.otaastart,
self.config.otaaend
],
orderby='devaddr')
if devices is None:
returnValue([])
devaddrs = [d.devaddr for d in devices]
returnValue(devaddrs)
@inlineCallbacks
def _getFreeOTAAddress(self):
"""Get the next free Over the Air Activation (OTAA) address.
Returns:
A 32 bit end device network address (DevAddr) on success, None otherwise.
"""
# Get all active OTAA device addresses
devaddrs = yield self._getOTAADevAddrs()
# Return None if no addresses available
if len(devaddrs) == len(self.otarange):
returnValue(None)
# Find the set difference between the two lists, return lowest free address
diff = self.otarange.difference(devaddrs)
returnValue(diff.pop())
@inlineCallbacks
def _getActiveDevice(self, devaddr):
"""Searches active devices for the given devaddr.
Args:
devaddr (int): A 32 bit end device network address (DevAddr).
Returns:
A device object if successful, None otherwise.
"""
# Search active device for devaddr
device = yield Device.find(where=['devaddr = ?', devaddr], limit=1)
returnValue(device)
def _checkDuplicateMessage(self, message):
"""Checks for duplicate gateway messages.
We check for duplicate messages that may have been sent from
different gateways that heard the same LoRa PHY payload. The
period to check is defined by the config parameter duplicateperod.
Filtering uses the arrival time and MIC as cache entries -
duplicate frames will have the same MIC.
Args:
message (MACMessage): LoRa MAC message object
Returns:
True if a duplicate is found, otherwise False.
"""
# Search the cache for matching MIC entries within
# self.config.duplicateperiod. Each entry in the
# cache list is a tuple (mic, timestamp)
if self.config.duplicateperiod == 0:
return False
mark = time.time()
duplicate = next(
(True for e in self.message_cache if e[0] == message.mic and e[1] +
self.config.duplicateperiod > mark), False)
if not duplicate:
self.message_cache.append((message.mic, mark))
return duplicate
def _cleanMessageCache(self):
"""Removes stale entries from the message cache.
This method is periodically called to limit the growth of
the message_cache list.
"""
mark = time.time()
self.message_cache = [
x for x in self.message_cache
if not (x[1] + self.config.duplicateperiod) < mark
]
def _manageMACCommandQueue(self):
"""Removes expired MAC Commands from the queue.
This method is periodically called to limit the queue size.
"""
mark = time.time()
self.commands = [
x for x in self.commands
if not (x[0] + self.config.macqueuelimit) < mark
]
@inlineCallbacks
def _processADRRequests(self):
"""Updates devices with target data rate, and sends ADR requests.
This method is called every adrcycletime seconds as a looping task.
"""
# If we are running, return
if self.adrprocessing is True:
returnValue(None)
self.adrprocessing = True
devices = yield Device.all()
sendtime = time.time()
for device in devices:
# Check this device is enabled
if not device.enabled:
continue
# Check ADR is enabled
if not device.adr:
continue
# Set the target data rate
target = device.getADRDatarate(self.band, self.config.adrmargin)
# If no target, or the current data rate is the target, continue
if target is None:
continue
# Set the device adr_datr
yield device.update(adr_datr=target)
# Only send a request if we need to change
if device.tx_datr == device.adr_datr:
continue
# If we are queueing commands, create the command and add to the queue.
# Replace any existing requests.
if self.config.macqueueing:
log.info("Queuing ADR MAC Command")
command = self._createLinkADRRequest(device)
self._dequeueMACCommand(device.deveui, command)
self._queueMACCommand(device.deveui, command)
continue
# Check we have reached the next scheduled ADR message time
scheduled = sendtime + self.config.adrmessagetime
current = time.time()
if current < scheduled:
yield txsleep(scheduled - current)
# Refresh and send the LinkADRRequest
sendtime = time.time()
yield self._sendLinkADRRequest(device)
self.adrprocessing = False
def _createSessionKey(self, pre, app, msg):
"""Create a NwkSKey or AppSKey
Creates the session keys NwkSKey and AppSKey specific for
an end-device to encrypt and verify network communication
and application data.
Args:
pre (int): 0x01 ofr NwkSKey, 0x02 for AppSKey
app (Application): The applicaiton object.
msg (JoinRequestMessage): The MAC Join Request message.
Returns:
int: 128 bit session key
"""
# Session key data: 0x0n | appnonce | netid | devnonce | pad (16)
data = struct.pack('B', pre) + \
intPackBytes(app.appnonce, 3, endian='little') + \
intPackBytes(self.config.netid, 3, endian='little') + \
struct.pack('<H', msg.devnonce) + intPackBytes(0, 7)
aesdata = aesEncrypt(intPackBytes(app.appkey, 16), data)
key = intUnpackBytes(aesdata)
return key
def _queueMACCommand(self, deveui, command):
"""Add a MAC command to the queue
Args:
deveui: (int) Device deveui
command: (Device): Command to add
"""
item = (int(time.time()), int(deveui), command)
self.commands.append(item)
def _dequeueMACCommand(self, deveui, command):
"""Remove MAC command(s) from the queue.
Removes all commands for device with deveui and commands of the
type command.cid
Args:
deveui: (int) Device deveui
command: (Device): Command to add
"""
ids = [
i for i, c in enumerate(self.commands)
if (deveui == c[1] and c[2].cid == command.cid)
]
for i in ids:
del self.commands[i]
def _scheduleDownlinkTime(self, tmst, offset):
"""Calculate the timestamp for downlink transmission
Args:
tmst (int): Gateway time counter of the received frame
offset (int): Number of seconds to add to tmst
Returns:
int: scheduled value of gateway time counter
"""
sts = tmst + int(offset * 1000000)
# Check we have not wrapped around the 2^32 counter
if sts > 4294967295:
sts -= 4294967295
return sts
def _txpkResponse(self, device, data, gateway, itmst=0, immediate=False):
"""Create Txpk object
Args:
device (Device): Target device
data (str): Data payload
gateway (Gateway): Target gateway
itmst (int): Gateway time counter of the received frame
immediate (bool): Immediate transmission if true, otherwise
scheduled
Returns:
Dict of txpk objects indexed as txpk[1], txpk[2]
"""
txpk = {}
for i in range(1, 3):
if immediate:
txpk[i] = Txpk(imme=True,
freq=device.rx[i]['freq'],
rfch=0,
powe=gateway.power,
modu="LORA",
datr=device.rx[i]['datr'],
codr="4/5",
ipol=True,
ncrc=False,
data=data)
else:
tmst = self._scheduleDownlinkTime(itmst, device.rx[i]['delay'])
txpk[i] = Txpk(tmst=tmst,
freq=device.rx[i]['freq'],
rfch=0,
powe=gateway.power,
modu="LORA",
datr=device.rx[i]['datr'],
codr="4/5",
ipol=True,
ncrc=False,
data=data)
return txpk
@inlineCallbacks
def processPushDataMessage(self, request, gateway):
"""Process a PUSH_DATA message from a LoraWAN gateway
Args:
request (GatewayMessage): the received gateway message object
gateway (Gateway): the gateway that sent the message
Returns:
True on success, otherwise False
"""
if not request.rxpk:
request.rxpk = []
for rxpk in request.rxpk:
# Decode the MAC message
message = MACMessage.decode(rxpk.data)
if message is None:
log.info(
"MAC message decode error for gateway {gateway}: message "
"timestamp {timestamp}",
gateway=gateway.host,
timestamp=str(rxpk.time))
returnValue(False)
# Check if thisis a duplicate message
if self._checkDuplicateMessage(message):
returnValue(False)
# Join Request
if message.isJoinRequest():
# Get the application using appeui
app = yield Application.find(
where=['appeui = ?', message.appeui], limit=1)
#app = next((a for a in self.applications if
# a.appeui == message.appeui), None)
if app is None:
log.info(
"Message from {deveui} - AppEUI {appeui} "
"does not match any configured applications.",
deveui=euiString(message.deveui),
appeui=message.appeui)
returnValue(False)
# Find the Device
device = yield Device.find(
where=['deveui = ?', message.deveui], limit=1)
if device is None:
#log.info("Message from unregistered device {deveui}",
# deveui=euiString(message.deveui))
#returnValue(False)
# TODO save device to database (cheng)
device = Device(deveui=message.deveui,
name='smk_node',
devclass='A',
enabled=True,
otaa=True,
devaddr=None,
devnonce=[],
appeui=message.appeui,
nwkskey='',
appskey='',
fcntup=0,
fcntdown=0,
fcnterror=False,
snr=[],
snr_average=0)
#device.save()
else:
# Check the device is enabled
if not device.enabled:
log.info("Join request for disabled device {deveui}.",
deveui=euiString(device.deveui))
returnValue(False)
# Process join request
joined = yield self._processJoinRequest(message, app, device)
if joined:
# Update the ADR measures
if self.config.adrenable:
device.updateSNR(rxpk.lsnr)
yield device.update(tx_chan=rxpk.chan,
tx_datr=rxpk.datr,
devaddr=device.devaddr,
nwkskey=device.nwkskey,
appskey=device.appskey,
time=rxpk.time,
tmst=rxpk.tmst,
gw_addr=gateway.host,
fcntup=0,
fcntdown=0,
fcnterror=False,
devnonce=device.devnonce,
snr=device.snr,
snr_average=device.snr_average)
log.info(
"Successful Join request from DevEUI {deveui} "
"for AppEUI {appeui} | Assigned address {devaddr}",
deveui=euiString(device.deveui),
appeui=euiString(app.appeui),
devaddr=devaddrString(device.devaddr))
# Send the join response
device.save()
self._sendJoinResponse(request, rxpk, gateway, app, device)
returnValue(True)
else:
log.info(
"Could not process join request from device "
"{deveui}.",
deveui=euiString(device.deveui))
returnValue(False)
# LoRa message. Check this is a registered device
device = yield self._getActiveDevice(message.payload.fhdr.devaddr)
if device is None:
log.info(
"Message from device using unregistered address "
"{devaddr}",
devaddr=devaddrString(message.payload.fhdr.devaddr))
returnValue(False)
# Check the device is enabled
if not device.enabled:
log.info("Message from disabled device {devaddr}",
devaddr=devaddrString(message.payload.fhdr.devaddr))
returnValue(False)
# Check frame counter
if not device.checkFrameCount(message.payload.fhdr.fcnt,
self.band.max_fcnt_gap,
self.config.fcrelaxed):
log.info("Message from {devaddr} failed frame count check.",
devaddr=devaddrString(message.payload.fhdr.devaddr))
log.debug(
"Received frame count {fcnt}, device frame count {dfcnt}",
fcnt=message.payload.fhdr.fcnt,
dfcnt=device.fcntup)
yield device.update(fcntup=device.fcntup,
fcntdown=device.fcntdown,
fcnterror=device.fcnterror)
returnValue(False)
# Perform message integrity check.
if not message.checkMIC(device.nwkskey):
log.info(
"Message from {devaddr} failed message "
"integrity check.",
devaddr=devaddrString(message.payload.fhdr.devaddr))
returnValue(False)
# Update SNR reading and device
device.updateSNR(rxpk.lsnr)
yield device.update(tx_chan=rxpk.chan,
tx_datr=rxpk.datr,
fcntup=device.fcntup,
fcntdown=device.fcntdown,
fcnterror=device.fcnterror,
time=rxpk.time,
tmst=rxpk.tmst,
adr=bool(message.payload.fhdr.adr),
snr=device.snr,
snr_average=device.snr_average,
gw_addr=gateway.host)
# Set the device rx window parameters
device.rx = self.band.rxparams((device.tx_chan, device.tx_datr),
join=False)
# Process MAC Commands
commands = []
# Standalone MAC command
if message.isMACCommand():
message.decrypt(device.nwkskey)
commands = [MACCommand.decode(message.payload.frmpayload)]
# Contains piggybacked MAC command(s)
elif message.hasMACCommands():
commands = message.commands
for command in commands:
if command.isLinkCheckReq():
self._processLinkCheckReq(device, command, request,
rxpk.lsnr)
elif command.isLinkADRAns():
self._processLinkADRAns(device, command)
# TODO: add other MAC commands
# Process application data message
if message.isUnconfirmedDataUp() or message.isConfirmedDataUp():
# Find the app
app = yield Application.find(
where=['appeui = ?', device.appeui], limit=1)
if app is None:
log.info(
"Message from {devaddr} - AppEUI {appeui} "
"does not match any configured applications.",
devaddr=euiString(device.devaddr),
appeui=device.appeui)
returnValue(False)
# Decrypt frmpayload
message.decrypt(device.appskey)
appdata = str(message.payload.frmpayload)
port = message.payload.fport
# Route the data to an application server via the configured interface
log.info("Outbound message from devaddr {devaddr}",
devaddr=devaddrString(device.devaddr))
interface = interfaceManager.getInterface(app.appinterface_id)
if interface is None:
log.error(
"No outbound interface found for application "
"{app}",
app=app.name)
elif not interface.started:
log.error(
"Outbound interface for application "
"{app} is not started",
app=app.name)
else:
self._outboundAppMessage(interface, device, app, port,
appdata)
# Send an ACK if required
if message.isConfirmedDataUp():
yield self.inboundAppMessage(device.devaddr,
'',
acknowledge=True)
def _outboundAppMessage(self, interface, device, app, port, appdata):
"""Sends application data to the application interface"""
interface.netServerReceived(device, app, port, appdata)
@inlineCallbacks
def inboundAppMessage(self, devaddr, appdata, acknowledge=False):
"""Sends inbound data from the application interface to the device
Args:
devaddr (int): 32 bit device address (DevAddr)
appdata (str): packed application data
acknowledge (bool): Acknowledged message
"""
log.info("Inbound message to devaddr {devaddr}",
devaddr=devaddrString(devaddr))
# Retrieve the active device
device = yield self._getActiveDevice(devaddr)
if device is None:
log.error("Cannot send to unregistered device address {devaddr}",
devaddr=devaddrString(devaddr))
returnValue(None)
# Check the device is enabled
if not device.enabled:
log.error(
"Inbound application message for disabled device "
"{deveui}",
deveui=euiString(device.deveui))
returnValue(None)
# Get the associated application
app = yield Application.find(where=['appeui = ?', device.appeui],
limit=1)
if app is None:
log.error(
"Inbound application message for {deveui} - "
"AppEUI {appeui} does not match any configured applications.",
deveui=euiString(device.deveui),
appeui=device.appeui)
returnValue(None)
# Find the gateway
gateway = self.lora.gateway(device.gw_addr)
if gateway is None:
log.error(
"Could not find gateway for inbound message to "
"{devaddr}.",
devaddr=devaddrString(device.devaddr))
returnValue(None)
# Increment fcntdown
fcntdown = device.fcntdown + 1
# Piggyback any queued MAC messages in fopts
fopts = ''
device.rx = self.band.rxparams((device.tx_chan, device.tx_datr),
join=False)
if self.config.macqueueing:
# Get all of this device's queued commands: this returns a list of tuples (index, command)
commands = [(i, c[2]) for i, c in enumerate(self.commands)
if device.deveui == c[1]]
for (index, command) in commands:
# Check if we can accommodate the command. If so, encode and remove from the queue
if self.band.checkAppPayloadLen(device.rx[1]['datr'],
len(fopts) + len(appdata)):
fopts += command.encode()
del self.commands[index]
else:
break
# Create the downlink message, encrypt with AppSKey and encode
response = MACDataDownlinkMessage(device.devaddr,
device.nwkskey,
device.fcntdown,
self.config.adrenable,
fopts,
int(app.fport),
appdata,
acknowledge=acknowledge)
response.encrypt(device.appskey)
data = response.encode()
# Create Txpk objects
txpk = self._txpkResponse(device,
data,
gateway,
itmst=int(device.tmst),
immediate=False)
request = GatewayMessage(version=2,
gatewayEUI=gateway.eui,
remote=(gateway.host, gateway.port))
# Save the frame count down
device.update(fcntdown=fcntdown)
# Send RX1 window message
self.lora.sendPullResponse(request, txpk[1])
# If Class A, send the RX2 window message
self.lora.sendPullResponse(request, txpk[2])
@inlineCallbacks
def _processJoinRequest(self, message, app, device):
"""Process an OTA Join Request message from a LoraWAN device
This method checks the message devnonce and integrity code (MIC).
If the devnonce has not been seen before, and the MIC is valid,
we have a valid join request, and we can create the session
keys and assign an OTA device address.
Args:
message (JoinRequestMessage): The join request message object
app (Application): The requested application object
device (Device): The requesting device object
Returns:
True on success, False otherwise.
"""
# Perform devnonce check
if not device.checkDevNonce(message):
log.info(
"Join request message from {deveui} failed message "
"devnonce check.",
deveui=euiString(message.deveui))
returnValue(False)
# Perform message integrity check.
if not message.checkMIC(app.appkey):
log.info(
"Message from {deveui} failed message "
"integrity check.",
deveui=euiString(message.deveui))
returnValue(False)
# Assign DevEUI, NwkSkey and AppSKey.
device.appeui = app.appeui
device.nwkskey = self._createSessionKey(1, app, message)
device.appskey = self._createSessionKey(2, app, message)
# If required, obtain a OTA devaddr for the device
if device.devaddr is None:
device.devaddr = yield self._getFreeOTAAddress()
returnValue(device.devaddr is not None)
def _sendJoinResponse(self, request, rxpk, gateway, app, device):
"""Send a join response message
Called if a join response message is to be sent.
Args:
request: request (GatewayMessage): Received gateway message object
app (Application): The requested application object
device (Device): The requesting device object
"""
# Get receive window parameters and
# set dlsettings field
device.rx = self.band.rxparams((device.tx_chan, device.tx_datr),
join=True)
dlsettings = 0 | self.band.rx1droffset << 4 | device.rx[2]['index']
# Create the Join Response message
log.info("Sending join response for devaddr {devaddr}",
devaddr=devaddrString(device.devaddr))
response = JoinAcceptMessage(app.appkey, app.appnonce,
self.config.netid, device.devaddr,
dlsettings, device.rx[1]['delay'])
data = response.encode()
txpk = self._txpkResponse(device, data, gateway, rxpk.tmst)
# Send the RX1 window messages
self.lora.sendPullResponse(request, txpk[1])
# Send the RX2 window message
self.lora.sendPullResponse(request, txpk[2])
def _processLinkCheckReq(self, device, command, request, lsnr):
"""Process a link check request
Args:
device (Device): Sending device
command (LinkCheckReq): LinkCheckReq object
"""
# We assume 'margin' corresponds to the
# absolute value of LNSR, as an integer.
# Set to zero if negative.
margin = max(0, round(lsnr))
# If we are processing the first request,
# gateway count must be one, we guess.
gwcnt = 1
# Create the LinkCheckAns response and encode. Set fcntdown
command = LinkCheckAns(margin=margin, gwcnt=gwcnt)
# Queue the command if required
if self.config.macqueueing:
self._queueMACCommand(device.deveui, command)
return
frmpayload = command.encode()
fcntdown = device.fcntdown + 1
# Create the downlink message. Set fport=0,
# encrypt with NwkSKey and encode
message = MACDataDownlinkMessage(device.devaddr,
device.nwkskey,
fcntdown,
self.config.adrenable,
'',
0,
frmpayload,
acknowledge=True)
message.encrypt(device.nwkskey)
data = message.encode()
gateway = self.lora.gateway(device.gw_addr)
if gateway is None:
log.info(
"Could not find gateway for gateway {gw_addr} for device "
"{devaddr}",
gw_addr=device.gw_addr,
devaddr=devaddrString(device.devaddr))
return
# Create GatewayMessage and Txpk objects, send immediately
request = GatewayMessage(version=1,
token=0,
remote=(gateway.host, gateway.port))
device.rx = self.band.rxparams((device.tx_chan, device.tx_datr))
txpk = self._txpkResponse(device, data, gateway, immediate=True)
# Update the device fcntdown
device.update(fcntdown=fcntdown)
# Send the RX2 window message
self.lora.sendPullResponse(request, txpk[2])
def _createLinkADRRequest(self, device):
"""Create a Link ADR Request message
Args:
device: (Device): Target device
Returns:
Link ADR Request object
"""
# Create the LinkADRRequest and encode
datarate = self.band.datarate_rev[device.adr_datr]
chmask = int('FF', 16)
command = LinkADRReq(datarate, 0, chmask, 6, 0)
return command
@inlineCallbacks
def _sendLinkADRRequest(self, device, command):
"""Send a Link ADR Request message
Called if an ADR change is required for this device.
Args:
device: (Device): Target device
command (LinkADRReq): Link ADR Request object
"""
frmpayload = command.encode()
# Create the downlink message. Increment fcntdown, set fport=0,
# encrypt with NwkSKey and encode
fcntdown = device.fcntdown + 1
log.info("Sending ADR Request to devaddr {devaddr}",
devaddr=devaddrString(device.devaddr))
message = MACDataDownlinkMessage(device.devaddr, device.nwkskey,
fcntdown, self.config.adrenable, '',
0, frmpayload)
message.encrypt(device.nwkskey)
data = message.encode()
gateway = self.lora.gateway(device.gw_addr)
if gateway is None:
log.info(
"Could not find gateway for gateway {gw_addr} for device "
"{devaddr}",
gw_addr=device.gw_addr,
devaddr=devaddrString(device.devaddr))
returnValue(None)
# Create GatewayMessage and Txpk objects, send immediately
request = GatewayMessage(version=1,
token=0,
remote=(gateway.host, gateway.port))
device.rx = self.band.rxparams((device.tx_chan, device.tx_datr))
txpk = self._txpkResponse(device, data, gateway, immediate=True)
# Update the device fcntdown
device.update(fcntdown=fcntdown)
# Send the RX2 window message
self.lora.sendPullResponse(request, txpk[2])
def _processLinkADRAns(self, device, command):
"""Process a link ADR answer
Returns three ACKS: power_ack, datarate_ack, channelmask_ack
Args:
device (Device): Sending device
command (LinkADRAns): LinkADRAns object
"""
# Not much to do here - we will know if the device had changed datarate via
# the rxpk field.
log.info("Received LinkADRAns from device {devaddr}",
devaddr=devaddrString(device.devaddr))