Micropython Example

Question

Micropython Example

Opened this issue 2 years ago · 7 comments

Hello! Has anyone successfully used aiocoap with Micropython? It seems feasible in theory but I could imagine there could be gotchas with asyncio, DTLS, etc.

Answer 1 · 2022-11-06T09:12:42.000Z

I've tried it back in early 2016, and fixed some compatibility issues, but didn't get to run it in full. But it's been ages, so maybe just try and report issues. You might want to use the simple6 transport, as the udp6 transport relies on POSIX socket details often unimplemented. There might be better options if your platform exposes its network stack more directly; which platform do you target?

Answer 2 · 2022-11-06T12:13:50.000Z

The ESP32, as it's the most accessible and comes in a wide array of variants that are supported by uPy.

Answer 3 · 2022-11-06T15:51:50.000Z

I started to play around with the new uPy package manager mip here. It's far from working but would be the best path forward.

Answer 4 · 2023-05-30T19:18:42.000Z

Any update on this?

In the meantime, aiocoap has gained support for running on pyodide (eg. in Jupyter notebooks), which while still being the regular CPython, shows that there are no weird dependencies on OS level stuff (even though one may need a custom transport).

Answer 5 · 2023-05-30T19:28:36.000Z

IIUC micropython has no full asyncio, and thus won't support the async UDP sockets aiocoap creates; it may be necessary to build an own transport on micropython's socket, possibly based on or inspired by https://github.com/perbu/dgram/blob/master/dgram.py.

That does sound well feasible, but there's some devious details around (such as: how will the system know to which IP address the packet went, if recvmsg is not supported?), but that should suffice to get something running.

From the resource usage perspective, I think it'd be preferable to run an embedded CoAP library and only expose requests and responses -- but that'll be more effort in total, and the building blocks I'm trying to establish on the path there are not quite there yet.

Answer 6 · 2023-05-31T13:25:17.000Z

Unfortunately no updates on my side. I didn't get too far in my MicroPython experiments. I did notice that the mip package manager is now officially released, which would be good to target. Most of the community seems to hang out in their Discord server, so if there's interest, that might be the best place to ask questions.

Answer 7 · 2023-05-31T13:47:53.000Z

I won't be using Discord, but it's possibly a suitable tool for others exploring this issue further.

I'll leave it open, both to indicate that there are not yet good examples of how (or whether) aiocoap can be used on micropython, and to have a place where others interested in trying it can exchange experiences.