MicroPython XBee3: transmit data example

XBee & XBee Gateway XBee Micropython & IDE plugin
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1

Ok so I have a python program that has a callback function that runs when the coordinator receives data from my MicroPython upload on the router device. The PS is enabled on the router device (autorun flashed firmware upon start-up).

I’m using an imported transmit micropython example through my Pycharm plugin.

So when I run my python program and then run the micropython program, the message from the micropython on the router module successfully sends a message to the coordinator, as confirmed by printing out the message on my python program’s Run window. So that is good!

I see this in my REPL with the first successful upload/run of the flashed firmware program:

soft reboot

Loading /flash/main.mpy…
Running bytecode…
Sending data to COORD
Data sent successfully

MicroPython v1.11-1443-g5fad4cf on 2020-04-16; XBee3 Zigbee with EFR32MG
Type “help()” for more information.
>>>

the problem is that once I do this… and then press the reset button on my flash uploaded router module, instead of a successful auto-run-upon-start-up transmission I get this in my REPL:

>>>
Loading /flash/main.mpy…
Running bytecode…
Traceback (most recent call last):
File “/flash/main.py”, line 48, in
File “/flash/main.py”, line 41, in find_device
OSError: [Errno 7107] ENOTCONN

MicroPython v1.11-1443-g5fad4cf on 2020-04-16; XBee3 Zigbee with EFR32MG
Type “help()” for more information.
>>>

I was hoping to instead witness a successful “micropython autoruns on start-up” type of scenario… even when I unplug the device and plug it back in it doesn’t seem to auto-run the program.

Again, the first micropython upload/run was successful. But after that when I unplug and plug back in I don’t get another successful transmission, thereby failing to autorun upon start-up.

What am I not understanding here?

thanks!

2

You need to give the module time to get onto a network.

Maybe call atcmd(‘AI’) (in your MicroPython code) every second until it returns 0, and then try to send your data.


import time, xbee
# wait for XBee to join network
while xbee.atcmd('AI') != 0:
    time.sleep(0.1)
# continue with previous code...
3

ooo ok interesting. How to call an atcmd(‘AI’) in Python programming? EDIT* I see the “get_parameter(String)” method might be what you are talking about, at least in the Python XBee Library documentation. or wait, do you mean to call this in my MicroPython program instead?

4

I’m talking about MicroPython. The atcmd() method is in the xbee module. I’ve updated my answer with a snippet of code that should work.