How to interrupt/stop the main thread and have to do something else

[GM-Script-Writer-62850]

Issues i am trying to work around:

• PICO W's wifi is only accessible on core 0 in the main thread (can't be nigher be accessed on core 1 nor on core 0 via a interrupt)
• uasyncio can only be used on a single core as far as i know so if it is on core 1 it can't be used for a server on a pico w
• urequest is a blocking function so I do not want to use in on my uasyncio core
• uaiohttpclient.py does not support post data
• The W5500-EVB-PICO can use the network on both cores, but this has been a stability nightmare when using _thread and DHT22s

Lets assume this example is running on core 0 with uasyncio on core 1:
3.9.1. A simple server for static pages (not planning on doing anything heavy, just need to receive a few bytes of data)

Most of the time will be spent on line 54 waiting on a client, i can trigger a interrupt from core 1 by toggling output pin tied to a irq, but said interrupt can't use the NIC and _thread.interrupt_main() is not implemented

With s.accept() in progress i can't just have a loop and check if there is something else to do, any idea of how to work around the limitations? the only thing i can think of would be upgrading uaiohttpclient.py thus not needing urequest to run on core 0 allowing my to use uasyncio on core 0 where it can run a sever and use uaiohttpclient.py then i can just use core 1 for slow stuff like reading sensors like DHT22s

[peterhinch]

A possible approach is to run uasyncio on core 0 and delegate blocking functions to core 1, as described here.

[GM-Script-Writer-62850]

in the case of blocking functions like urequest when using a pico w this MUST be on core 0 in the main thread or it will fail

[karfas]

urequest is a blocking function so I do not want to use in on my uasyncio core
uaiohttpclient.py does not support post data

In my opinion, your usage of (blocking) urequest is the main problem here.
Why not hack uaiohttpclient to support POST requests ? At least for small amounts of data (where you can calculate the Content-Length: header) POST is not so much different from GET.

[GM-Script-Writer-62850]

https://pastebin.com/fWPJJrVh

Not sure about performance of lines 60 and 61 is there a better way

edit and now i need to patch it for use of not port 80, i could just hard code it to port 8080...

[rkompass]

In the reference you gave there is also 3.9.3. An asynchronous web server. Did you try that too? And isn't it what you need?
Or can you explain, why not?

[GM-Script-Writer-62850]

• urequest is a blocking function so I do not want to use in on my uasyncio core
• PICO W's wifi is only accessible on core 0 in the main thread
• uaiohttpclient.py does not support post data

i'd love to use 2 instances of uasyncio, but that is not supported

[Carglglz]

@GM-Script-Writer-62850 I made an async_urequest.py version that may be of help (just delete/comment the ssl keyword arg here). I haven't tested the POST method but I guess it should work 👍🏼

[GM-Script-Writer-62850]

meanwhile i was patching... uaiohttpclient.py did not test it yet