Micropython flask-like for raspberry pi pico and pico-eth-ch9121 Ethernet to UART converter.

Pico-eth-ch9121:

• constructor wiki.
• ETH-01.pdf

Raspberry pi pico micropython:

• firmware.
• Documentation.

• Pico: Raspberry pi pico Board.
• ch9121: Pico-eth-ch9121 Board.
• Lan: Local Area Network.

The configuration for TCP server is stored in config.py.

1. main.py is the entry point of the code for the pico.
2. lib is the default directory for the modules. No need of __init__.py file. Our libraries will be stored there.
3. lib\server.py is the class for the ch9121 server with the UART0 configuration.
4. lib\web.py is the tiny framework (flask-like) to manage the request and response.
5. lib\action.py is only for the exemple.

main.py

import gc
import uasyncio as asyncio
from ujson import dumps, loads
from config import WEB_CONFIG
from server import CH9121
from web import App, reponse
from action import do_led

# Setup the server and the App
server = CH9121()

loop = asyncio.get_event_loop()
print("start config")
loop.run_until_complete(server.set_tcp_server(**SERVER_CONFIG))
print("config complet")
loop.close()

app = App(
    server=server,
    token=WEB_CONFIG["TOKEN"]
)

# Memory clean
gc.collect()

# Route section
@app.route('/', methods=["POST"], security=True)
def main(request):
    actions = loads(request.headers["actions"])
    do_led(actions["LED"])
    return reponse(
        http_code=200,
        body=dumps(actions),
        content_type="json"
    )

# Loop section
loop = asyncio.get_event_loop()
loop.create_task(app.serve())
loop.run_forever()

The very important part is @app.route('/', methods=["POST"], security=True)

1. the route (here is the root route), Each route must be different and they is no match pattern.
2. the methods allowed (POST, GET...).
3. the security (it is optional). The define token in the config.py must be past to the request in the header with the key token.

vs-code with the pico-go extension is very usefull for developping the project.

• tips: add in .vscode\settings.json "python.analysis.extraPaths": [".vscode\Pico-Stub\stubs", "lib"]` to be in the same condition as the pico.

Thonny is more stable to upload and run the code on the pico than pico-go extension.