❌ [Experimental, not stable] Add websocket

[caco3]

This PR adds websocket support. With this we can make the web UI more responsive.

Call http://<IP>/websocket.html for a test:

[22:43:02] Trying to open a WebSocket connection...
[22:43:02] Connection opened
[..]
[22:43:54] {"round": "2"}
[22:43:54] {"uptime": "136"}
[22:43:54] {"state": "Take Image"}
[22:44:05] {"state": "Aligning"}
[22:44:45] {"state": "Digitalization of Digital ROIs"}
[22:44:49] {"state": "Digitalization of Analog ROIs"}
[22:45:01] {"state": "Post-Processing"}
[22:45:02] {"state": "Sending MQTT"}
[22:45:03] {"value": "531.72530", "number": "main"}
[22:45:03] {"error": "no error", "number": "main"}
[22:45:04] {"raw": "53N.72530", "number": "main"}
[22:45:04] {"state": "Flow finished"}
[22:45:04] {"round duration": "70"}
[22:45:04] {"cpu temperature": "69.444443"}
[22:45:05] {"wifi rssi": "-53"}

Notes

• The needed memory for the websockets are in PSRAM
  Nevertehless some extra internal memory is needed due to the increased config.max_uri_handlers.

[nliaudat]

Why no merge ? It seems clean code after a small review.
Regards

[caco3]

Why no merge ? It seems clean code after a small review. Regards

When I tested it last, it did not work stable, and I was unable to find out why.

Maybe in winter I will have more time again to look into it but not now.

[nliaudat]

90% sur it's related to your psram implementation.

free_psram_heap() = unknown, no include and it's not an usual esp-idf function.

The psram need to be allocated with heap_caps_malloc().
Regards

[caco3]

Well, you didn't really look into the code, right?

A quick search would have shown you that it is a wrapper I wrote for debugging:
https://github.com/search?q=repo%3Ajomjol%2FAI-on-the-edge-device%20free_psram_heap&type=code

I strongly suggest you first study https://github.com/jomjol/AI-on-the-edge-device/blob/rolling/code/components/jomjol_helper/psram.cpp before giving any claims!