MicroPython Forum (Archive)

Did you try using the AWS IOT mqtt with a CPython mqtt client like paho.mqtt?

you import network so STAT_NO_AP_FOUND is not defined in global space but in network.

Therefore you have to check against "network.STAT_NO_AP_FOUND" or do "from network import *"

... I always thought the interrupt can interrupt while another operation is reading an object and that only a 1Byte operation is atomic, but I might be wrong. As Dave says this is arch dependent. For example an N byte wide bus can enforce atomic N byte access at the hardware level. How big is N for...

On most 32-bit architectures (and definitely on the ARM), retrieving or storing a 32-bit value is an atomic operation. You'll never get 3 bytes from one time and an additional byte from an interrupt handler. I always thought the interrupt can interrupt while another operation is reading an object a...

no we are not using threads. in threads you would have the problem that the control could be taken away from both threads. In this case the control can only be taken from the main loop. However, the main loop only accesses the pointer but doesn't modify it. The interrupt always runs to end and there...

if you need to disconnect then you don't have working code.. how is that code supposed to work when you subscribe to a message and wait for a message on that topic?

If sending the command is needed then you could measure how long it takes to run the interrupt, just to be sure that it doesn't take too long. Your 5ms interval however could make it difficult. The UART has a buffer, so it should be possible to read multiple values back from it. I can't tell you how...

That's good news! Thanks for sharing your findings.

I see a few problems with your code so I'll try to break it down: timer.init(period=5, mode=Timer.PERIODIC, callback=timed_poll()) It should be "timer.init(period=5, mode=Timer.PERIODIC, callback=timed_poll)" buf = bytearray(100) # Is an explicit global buffer needed and this the right place to crea...