LoraWAN support

[d-ferenczi]

Hello,
as a follow-up to the discussion started at atomvm/AtomVM#1125, I'd be interested to know what it would take to have LoraWAN support to AtomVM.
I saw that support is present in FreeRTOS [1]. Is it possible to use its API or any implementation already available for the hardware?
My end goal is to experiment with setups consisting of AtomVM and LoraWAN as soon as I can, but I'd be interested in contributing to an erlang implementation as well.

[1] https://www.freertos.org/lorawan/index.html

[UncleGrumpy]

It would probably take more work to port the vanilla FreeRTOS implementation to esp32, than starting with a library written for ESP-IDF natively, like lmic-esp-idf, but since the core LoRa functionality is already implemented in this repository that would be repeating much of the work that has already been done.

I do not believe any more C code is needed (either nifs, or ports) to implement the rest of the LoRaWAN protocol, that can be implemented in Erlang, utilizing the hardware functionality exposed by this driver.

[UncleGrumpy]

I just came across this application:
https://github.com/gotthardp/lorawan-server

It definitely won’t work with AtomVM out of the box, it uses mnesia extensively, and this is something I don’t expect AtomVM to be able to support any time soon. Several of the connectors may be difficult to support, but mqtt should be quite feasible. It may be helpful as a guide for implementing the lorawan protocol.

I will look into this closer when I have more time available.