zephyr: Add network module with WLAN support. - #19666
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Add a network module to the zephyr port that supports wifi. Signed-off-by: Vdragon <mail@massdriver.space>
Revamp socket module and add a SSLContext implementation. Signed-off-by: Vdragon <mail@massdriver.space>
Allow relocating the MBedTLS heap. Signed-off-by: Vdragon <mail@massdriver.space>
Allow manually specifing a memory-region. Intended to workaround nonstandard linkage like espressif's. Signed-off-by: Vdragon <mail@massdriver.space>
Add a function to query system heap usage. Signed-off-by: Vdragon <mail@massdriver.space>
Store thread state in a safer way. Signed-off-by: Vdragon <mail@massdriver.space>
Select new features in mpconfig. Clean up prj.conf Add networking.conf describing configuration for network features. Signed-off-by: Vdragon <mail@massdriver.space>
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Configure bflb boards to support wifi features. Signed-off-by: Vdragon <mail@massdriver.space>
Add an ESP32-C5 board. Signed-off-by: Vdragon <mail@massdriver.space>
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Thanks to @sylvioalves testing this and reporting it worked fine with the modifications he handed I have now applied, I figured what was 'wrong' with esp32c5: 
The clone made a single functional change to the devkitc schematic: The board was browning out the entire time and requires one of those bridged out to work properly. |
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Summary
Add a network module that supports WLAN.
Add SSLContext support.
Revamp Socket module.
Add misc features supporting this (PSRAM stuffs, mbedtls, small utility to keep track of things).
Add ESP32-C5-DevKitC board.
The API matches documentation and often extend things to support Zephyr-specific features.
Testing
'Happy Path':
On:
(network functionalities: sort of Yes, Sockets and TLS: failed)works good now.Trade-offs and Alternatives
This is possibly necessary for Espressif support.However this reduces portability.Espressif doesn't work properly: The espressif network stack regularly interrupts execution and the memory organization is not sane, this confuses the micropython GC and results in crashes or things not working as expected / at all. I am not sure if it is a espressif issue, or if the implementation should be robust against this. For comparison, Bouffalolab WIFI6 is a Zephyr-native network stack. One possible solution is keeping every socket and network functions running in a purely zephyr context and instead queue events and queries from micropython context: This is simple for networking as it already works like that and another layer will have minimal effects, but for sockets this is much less practical.Generative AI
I did not use generative AI tools to write code for this PR.
I used generative AI tools to do research on sockets, documents micropython APIs (seriously it needs more comments, I struggled previously on this and AI is a crutch here), exploring the espressif elements, and debugging mbedtls configuration.
Made possible by donations from @josuah