@Fakstory I made a tarball and placed it here: https://github.com/robert-hh/Shared-Stuff.git You should be able to load it with the Pycom update tools. I have no GPy here, so I cannot test, whether the firmware works.

@Nazz Will need to do the opposite of what you've done here, send from the RPi, recvieve on the FiPy (see here: https://docs.pycom.io/chapter/firmwareapi/pycom/machine/UART.html#uartreadnbytes), and then do what ever sending you require.

@archana-kadam Normal LTE no.. unless you use a WiFi-LTE router (MiFi) or external LTE modem.

@robert-hh great thank you it worked perfectly!

Thanks for the suggestions! Still looking to get some examples how to serialize sensor data with MicroPython for TTN. All examples I found are for Arduino. Maybe @bucknall has some nice examples around?

@Ralph Thanks a lot for your quick answer. i will keep going with rshell.