def test():
freq(160000000)
mtx = Pin(14, Pin.OUT) # Define pins
mckout = Pin(15, Pin.OUT, value=0) # clocks must be initialised to zero.
mrx = Pin(13, Pin.IN)
mckin = Pin(12, Pin.IN)
objsched = Sched(heartbeat=1)
channel = SynCom(objsched, True, mckin, mckout, mrx, mtx)
channel.start()
objsched.add_thread(passive_thread(channel))
try:
objsched.run()
finally:
mckout(0)
def test():
stx = Pin(Pin.board.Y5, Pin.OUT_PP) # Define pins
sckout = Pin(Pin.board.Y6, Pin.OUT_PP)
sckout.value(0) # Don't assert clock until data is set
srx = Pin(Pin.board.Y7, Pin.IN)
sckin = Pin(Pin.board.Y8, Pin.IN)
reset = Pin(Pin.board.Y4, Pin.OPEN_DRAIN)
objsched = Sched(heartbeat=1)
channel = SynCom(objsched, False, sckin, sckout, srx, stx)
channel.start(reset, 0)
objsched.add_thread(initiator_thread(channel))
try:
objsched.run()
finally:
sckout.value(0)
def test():
freq(160000000)
dout = Pin(14, Pin.OUT, value=0) # Define pins
ckout = Pin(15, Pin.OUT, value=0) # clocks must be initialised to zero.
din = Pin(13, Pin.IN)
ckin = Pin(12, Pin.IN)
channel = SynCom(True, ckin, ckout, din, dout)
loop = asyncio.get_event_loop()
loop.create_task(heartbeat())
loop.create_task(channel.start(passive_task))
try:
loop.run_forever()
except KeyboardInterrupt:
pass
finally:
ckout(0)
def test():
dout = Pin(Pin.board.Y5, Pin.OUT_PP, value=0) # Define pins
ckout = Pin(Pin.board.Y6, Pin.OUT_PP,
value=0) # Don't assert clock until data is set
din = Pin(Pin.board.Y7, Pin.IN)
ckin = Pin(Pin.board.Y8, Pin.IN)
reset = Pin(Pin.board.Y4, Pin.OPEN_DRAIN)
sig_reset = Signal(reset, invert=True)
channel = SynCom(False, ckin, ckout, din, dout, sig_reset, 10000)
loop = asyncio.get_event_loop()
loop.create_task(heartbeat())
loop.create_task(channel.start(initiator_task))
try:
loop.run_forever()
except KeyboardInterrupt:
pass
finally:
ckout.value(0)
class MQTTlink:
lw_topic = None
lw_msg = None
lw_retain = False
lw_qos = 0
@classmethod
def will(cls, topic, msg, retain=False, qos=0):
cls.lw_topic = topic
cls.lw_msg = msg
cls.lw_retain = retain
cls.lw_qos = qos
status_msgs = ('connected to broker', 'awaiting broker',
'awaiting default network', 'awaiting specified network',
'publish OK', 'running', 'unknown', 'Will registered', 'Fail to connect to broker',
'WiFi up', 'WiFi down')
def __init__(self, *args, **kwargs):
d = defaults # d is the config dict: initially populate with default values
for arg in args:
d.update(arg) # Hardware and network configs
d.update(kwargs)
# d is now populated.
self.user_start = d['user_start']
shan = d['status_handler']
self.s_han = (default_status_handler, ()) if shan is None else shan # coro
self.crash_han = d['crash_handler']
self.wifi_han = d['wifi_handler']
self.init_str = buildinit(d)
self.keepalive = d['keepalive']
self._evtrun = asyncio.Event()
self.verbose = d['verbose']
# Watchdog timeout for ESP8266 (ms).
wdog = d['timeout'] * 1000
# SynCom string mode
self.channel = SynCom(False, d['sckin'], d['sckout'], d['srx'], d['stx'],
d['reset'], wdog, True, self.verbose)
if 'led' in d:
asyncio.create_task(heartbeat(d['led']))
# Start the SynCom instance. This will run self.start(). If an error
# occurs self.quit() is called which returns to Syncom's start() method.
# This waits on ._die before forcing a failure on the ESP8266 and re-running
# self.start() to perform a clean restart.
asyncio.create_task(self.channel.start(self.start, self._die))
self.subs = {} # (callback, qos, args) indexed by topic
self.publock = asyncio.Lock()
self.puback = asyncio.Event()
self.evttim = asyncio.Event()
self.evtwifi = asyncio.Event()
# Only specify network on first run
self.first_run = True
self._time = 0 # NTP time. Invalid.
# ESP8266 returns seconds from 2000 because I believed the docs.
# Maintainers change the epoch on a whim.
# Calculate ofsets in CPython using datetime.date:
# (date(2000, 1, 1) - date(1970, 1, 1)).days * 24*60*60
epoch = {2000 : 0, 1970 : 946684800} # Offset to add.
self._epoch_fix = epoch[gmtime(0)[0]] # Find offset on current platform
# API
async def publish(self, topic, msg, retain=False, qos=0):
qos_check(qos)
validate(topic, 'topic') # Raise ValueError if invalid.
validate(msg, 'message')
await self.ready()
async with self.publock:
self.channel.send(argformat(PUBLISH, topic, msg, int(retain), qos))
# Wait for ESP8266 to complete. Quick if qos==0. May be very slow
# in an outage
await self.puback.wait()
async def subscribe(self, topic, qos, callback, *args):
qos_check(qos)
# Save subscription to resubscribe after outage
self.subs[topic] = (callback, qos, args)
# Subscribe
await self.ready()
self.channel.send(argformat(SUBSCRIBE, topic, qos))
# Command handled directly by mqtt.py on ESP8266 e.g. MEM
async def command(self, *argsend):
await self.ready()
self.channel.send(argformat(*argsend))
def running(self):
return self._evtrun.is_set()
async def ready(self):
await self._evtrun.wait()
await self.evtwifi.wait()
def wifi(self):
return self.evtwifi.is_set()
# Attempt to retrieve NTP time in secs since 2000 or device epoch
async def get_time(self, pause=120, y2k=False):
delta = 0 if y2k else self._epoch_fix
self.evttim.clear() # Defensive
self._time = 0 # Invalidate
while True:
await self.ready()
self.channel.send(TIME)
try:
await asyncio.wait_for(self.evttim.wait(), pause // 2)
except asyncio.TimeoutError:
pass
if self._time:
return self._time + delta # Fix epoch
await asyncio.sleep(pause)
# API END
def _do_time(self, action): # TIME received from ESP8266
try:
self._time = int(action[0])
except ValueError: # Gibberish.
self._time = 0 # May be 0 if ESP has signalled failure
self.evttim.set()
self.evttim.clear()
async def _die(self): # ESP has crashed. Run user callback if provided.
cb, args = self.crash_han
cb(self, *args)
await asyncio.sleep_ms(0)
# Convenience method allows this error code:
# return self.quit(message)
# This method is called from self.start. Note that return is to SynCom's
# .start method which will launch ._die
def quit(self, *args):
if args is not ():
self.verbose and print(*args)
self._evtrun.clear()
def get_cmd(self, istr):
ilst = istr.split(SEP)
return ilst[0], ilst[1:]
def do_status(self, action, last_status):
try:
iact = int(action[0])
except ValueError: # Gibberish from ESP8266: caller reboots
return UNKNOWN
if iact == PUBOK:
# Occurs after all publications. If qos==0 immediately, otherwise
# when PUBACK received from broker. May take a long time in outage.
# If a crash occurs, puback is cleared by start()
self.puback.set()
self.puback.clear()
elif iact == RUNNING:
self._evtrun.set()
if iact == WIFI_UP:
self.evtwifi.set()
elif iact == WIFI_DOWN:
self.evtwifi.clear()
# Detect WiFi status changes. Ignore initialisation and repeats
if last_status != -1 and iact != last_status and iact in (WIFI_UP, WIFI_DOWN):
cb, args = self.wifi_han
cb(self.evtwifi.is_set(), self, *args)
if self.verbose:
if iact != UNKNOWN:
if iact != last_status: # Ignore repeats
printtime()
print('Status: ', self.status_msgs[iact])
else:
printtime()
print('Unknown status: {} {}'.format(action[1], action[2]))
return iact
# start() is run each time the channel acquires sync i.e. on startup and also
# after an ESP8266 crash and reset.
# Behaviour after fatal error with ESP8266:
# It clears ._evtrun to cause local tasks to terminate, then returns.
# A return causes the local channel instance to launch .die then issues
# a hardware reset to the ESP8266 (See SynCom.start() and .run() methods).
# After acquiring sync, start() gets rescheduled.
async def start(self, channel):
self.verbose and print('Starting...')
self.puback.set() # If a crash occurred while a pub was pending
self.puback.clear() # let it terminate and release the lock
self.evttim.set() # Likewise for get_time: let it return fail status.
self.evttim.clear()
await asyncio.sleep_ms(0)
self._evtrun.clear() # Set by .do_status
s_task, s_args = self.s_han
if self.lw_topic is not None:
channel.send(argformat(WILL, self.lw_topic, self.lw_msg, self.lw_retain, self.lw_qos))
res = await channel.await_obj()
if res is None: # SynCom timeout
await s_task(self, ESP_FAIL, *s_args)
return self.quit('ESP8266 fail 1. Resetting.')
command, action = self.get_cmd(res)
if command == STATUS:
iact = self.do_status(action, -1)
await s_task(self, iact, *s_args)
if iact in _BAD_STATUS:
return self.quit('Bad status: {}. Resetting.'.format(iact))
else:
self.verbose and print('Expected will OK got: ', command, action)
channel.send(self.init_str)
while not self._evtrun.is_set(): # Until RUNNING status received
res = await channel.await_obj()
if res is None:
await s_task(self, ESP_FAIL, *s_args)
return self.quit('ESP8266 fail 2. Resetting.')
command, action = self.get_cmd(res)
if command == STATUS:
iact = self.do_status(action, -1)
result = await s_task(self, iact, *s_args)
if iact == SPECNET:
if result == 1:
channel.send('1') # Any string will do
else:
return self.quit()
if iact in _BAD_STATUS:
return self.quit('Bad status. Resetting.')
else:
self.verbose and print('Init got: ', command, action)
# On power up this will do nothing because user awaits .ready
# before subscribing, so self.subs will be empty.
for topic in self.subs:
qos = self.subs[topic][1]
self.channel.send(argformat(SUBSCRIBE, topic, qos))
self.verbose and print('About to run user program.')
if self.user_start[0] is not None:
self.user_start[0](self, *self.user_start[1]) # User start function
cb, args = self.wifi_han
cb(True, self, *args)
# Initialisation is complete. Process messages from ESP8266.
iact = -1 # Invalidate last status for change detection
while True: # print incoming messages, handle subscriptions
chan_state = channel.any()
if chan_state is None: # SynCom Timeout
self._evtrun.clear()
elif chan_state > 0:
res = await channel.await_obj()
command, action = self.get_cmd(res)
if command == SUBSCRIPTION:
if action[0] in self.subs: # topic found
cb, qos, args = self.subs[action[0]]
action += args
# Callback gets topic, message, retained, plus any user args
cb(*action) # Run the callback
elif command == STATUS: # 1st arg of status is an integer
iact = self.do_status(action, iact) # Update pub q and wifi status
await s_task(self, iact, *s_args)
if iact in _DIRE_STATUS:
return self.quit('Fatal status. Resetting.')
elif command == TIME:
self._do_time(action)
elif command == MEM: # Wouldn't ask for this if we didn't want a printout
print('ESP8266 RAM free: {} allocated: {}'.format(action[0], action[1]))
else:
await s_task(self, UNKNOWN, *s_args)
return self.quit('Got unhandled command, resetting ESP8266:', command, action) # ESP8266 has failed
await asyncio.sleep_ms(20)
if not self._evtrun.is_set(): # self.quit() has been called.
await s_task(self, NO_NET, *s_args)
return self.quit('Not running, resetting ESP8266')
class MQTTlink(object):
lw_topic = None
lw_msg = None
lw_retain = False
lw_qos = 0
@classmethod
def will(cls, topic, msg, retain=False, qos=0):
cls.lw_topic = topic
cls.lw_msg = msg
cls.lw_retain = retain
cls.lw_qos = qos
status_msgs = ('connected to broker', 'awaiting broker',
'awaiting default network', 'awaiting specified network',
'publish OK', 'running', 'unk', 'Will registered', 'Fail to connect to broker',
'WiFi up', 'WiFi down')
def __init__(self, d):
self.user_start = (d['user_start'], d['args'])
self.init_str = buildinit(d)
# Synchroniser idle until started.
self.rtc_synchroniser = RTCsynchroniser(self, d['rtc_resync'], d['local_time_offset'])
self.keepalive = d['keepalive']
self._running = False
self.verbose = d['verbose']
# Watchdog timeout for ESP8266 (ms).
wdog = d['timeout'] * 1000
# SynCom string mode
self.channel = SynCom(False, d['sckin'], d['sckout'], d['srx'], d['stx'],
d['reset'], wdog, True, self.verbose)
loop = asyncio.get_event_loop()
loop.create_task(heartbeat())
# Start the SynCom instance. This will run self.start(). If an error
# occurs self.quit() is called which cancels all NamedTask instances
# and returns to Syncom's start() method. This waits on Cancellable.cancel_all()
# before forcing a failure on the ESP8266 and re-running self.start()
# to perform a clean restart.
loop.create_task(self.channel.start(self.start, Killer()))
self.subs = {} # Callbacks indexed by topic
self.pubs = []
self._pub_free = True # No publication in progress
self.s_han = default_status_handler
self.wifi_han = (lambda *_ : None, ())
self._wifi_up = False
# Only specify network on first run
self.first_run = True
# API
def publish(self, topic, msg, retain=False, qos=0):
qos_check(qos)
validate(topic, 'topic') # Raise ValueError if invalid.
validate(msg, 'message')
self.pubs.append((topic, msg, 1 if retain else 0, qos))
def pubq_len(self):
return len(self.pubs)
def subscribe(self, topic, qos, callback, *args):
qos_check(qos)
self.subs[topic] = (callback, args)
self.channel.send(argformat(SUBSCRIBE, topic, qos))
# Command handled directly by mqtt.py on ESP8266 e.g. MEM
def command(self, *argsend):
self.channel.send(argformat(*argsend))
# Is Pyboard RTC synchronised?
def rtc_syn(self):
return self.rtc_synchroniser._rtc_syn()
def status_handler(self, coro):
self.s_han = coro
def wifi_handler(self, cb, *args):
self.wifi_han = (cb, args)
def running(self):
return self._running
def wifi(self):
return self._wifi_up
# API END
# Convenience method allows return self.quit() on error
def quit(self, *args):
if args is not ():
self.vbprint(*args)
self._running = False
# Note that if this method is called from self.start return is to
# SynCom's start method which will wait on the Killer instance to
# cancel all Cancellable tasks
# On publication of a qos 1 message this is called with False. This prevents
# further pubs until the response is received, ensuring we wait for the PUBACK
# that corresponds to the last publication.
# This delay can be arbitrarily long if WiFi connectivity has been lost.
def pub_free(self, val = None):
if val is not None:
self._pub_free = val
return self._pub_free
def vbprint(self, *args):
if self.verbose:
print(*args)
def get_cmd(self, istr):
ilst = istr.split(SEP)
return ilst[0], ilst[1:]
def do_status(self, action, last_status):
try:
iact = int(action[0])
except ValueError: # Gibberish from ESP8266: caller reboots
return UNKNOWN
if iact == PUBOK:
self.pub_free(True) # Unlock so we can do another pub.
elif iact == RUNNING:
self._running = True
# Detect WiFi status changes. Ignore initialisation and repeats
if last_status != -1 and iact != last_status and iact in (WIFI_UP, WIFI_DOWN):
self._wifi_up = iact == WIFI_UP
cb, args = self.wifi_han
cb(self._wifi_up, *args)
if self.verbose:
if iact != UNKNOWN:
if iact != last_status: # Ignore repeats
printtime()
print('Status: ', self.status_msgs[iact])
else:
printtime()
print('Unknown status: {} {}'.format(action[1], action[2]))
return iact
# PUBLISH
@asyn.cancellable
async def _publish(self):
while True:
if len(self.pubs):
args = self.pubs.pop(0)
secs = 0
# pub free can be a long time coming if WiFi is down
while not self._pub_free:
# If pubs are queued, wait 1 sec to respect ESP8266 buffers
await asyncio.sleep(1)
if self._wifi_up:
secs += 1
if secs > 60:
self.quit('No response from ESP8266')
break
else:
self.channel.send(argformat(PUBLISH, *args))
# All pubs send PUBOK.
# No more pubs allowed until PUBOK received.
self.pub_free(False)
else:
await asyncio.sleep_ms(20)
# start() is run each time the channel acquires sync i.e. on startup and also
# after an ESP8266 crash and reset.
# Behaviour after fatal error with ESP8266:
# It sets _running False to cause local tasks to terminate, then returns.
# A return causes the local channel instance to wait on the exit_gate to cause
# tasks in this program terminate, then issues a hardware reset to the ESP8266.
# (See SynCom.start() method). After acquiring sync, start() gets rescheduled.
async def start(self, channel):
self.vbprint('Starting...')
self.subs = {} # Callbacks indexed by topic
self._pub_free = True # No publication in progress
self._running = False
if self.lw_topic is not None:
channel.send(argformat(WILL, self.lw_topic, self.lw_msg, self.lw_retain, self.lw_qos))
res = await channel.await_obj()
if res is None: # SynCom timeout
await self.s_han(self, ESP_FAIL)
return self.quit('ESP8266 fail 1. Resetting.')
command, action = self.get_cmd(res)
if command == STATUS:
iact = self.do_status(action, -1)
await self.s_han(self, iact)
if iact in _BAD_STATUS:
return self.quit('Bad status: {}. Resetting.'.format(iact))
else:
self.vbprint('Expected will OK got: ', command, action)
channel.send(self.init_str)
while not self._running: # Until RUNNING status received
res = await channel.await_obj()
if res is None:
await self.s_han(self, ESP_FAIL)
return self.quit('ESP8266 fail 2. Resetting.')
command, action = self.get_cmd(res)
if command == STATUS:
iact = self.do_status(action, -1)
result = await self.s_han(self, iact)
if iact == SPECNET:
if result == 1:
channel.send('1') # Any string will do
else:
return self.quit()
if iact in _BAD_STATUS:
return self.quit('Bad status. Resetting.')
else:
self.vbprint('Init got: ', command, action)
self.vbprint('About to run user program.')
if self.user_start is not None:
self.user_start[0](self, *self.user_start[1]) # User start function
loop = asyncio.get_event_loop()
loop.create_task(asyn.Cancellable(self._publish)())
self.rtc_synchroniser._start() # Run coro if synchronisation is required.
cb, args = self.wifi_han
cb(True, *args)
# Initialisation is complete. Process messages from ESP8266.
iact = -1 # Invalidate last status for change detection
while True: # print incoming messages, handle subscriptions
chan_state = channel.any()
if chan_state is None: # SynCom Timeout
self._running = False
elif chan_state > 0:
res = await channel.await_obj()
command, action = self.get_cmd(res)
if command == SUBSCRIPTION:
if action[0] in self.subs: # topic found
cb, args = self.subs[action[0]]
action += args
cb(*action) # Run the callback
elif command == STATUS: # 1st arg of status is an integer
iact = self.do_status(action, iact) # Update pub q and wifi status
await self.s_han(self, iact)
if iact in _DIRE_STATUS:
return self.quit('Fatal status. Resetting.')
elif command == TIME:
self.rtc_synchroniser._do_time(action)
elif command == MEM: # Wouldn't ask for this if we didn't want a printout
print('ESP8266 RAM free: {} allocated: {}'.format(action[0], action[1]))
else:
await self.s_han(self, UNKNOWN)
return self.quit('Got unhandled command, resetting ESP8266:', command, action) # ESP8266 has failed
await asyncio.sleep_ms(20)
if not self._running: # self.quit() has been called.
await self.s_han(self, NO_NET)
return self.quit('Not running, resetting ESP8266')