@m5stack I will share pseudo-codes of the current implementation, which is stable so far:
CycleTimer = Timer(-1)
def main():
# init and connect mqtt client
doCycle()
def doCycle():
global CycleTimer
# send stuff from mqtt
# NOTE: do not use machine.lightsleep() as publish() is NOT synchronous
# lightsleep() will block data from being sent
CycleTimer.init(period=5000, mode=Timer.ONE_SHOT, callback=doCycle)
NOTE: this is power-intensive; calling lightsleep() will cause uiflow's mqtt client to crash quickly.
