CH9120 Micropython library

About

After purchasing a Waveshare RP2350-ETH, I wanted to be able to use a webserver, specifically Microdot.

Tried writing my own ASGI webserver, attempting to fake sockets and other time-wasting ventures, I settled on providing a StreamReader and StreamWriter with UART which is mostly compatible with TCP sockets.

Usage

Use the 'Network configuration tool' as provided on the Waveshare wiki page to configure your device to be in TCP server mode.

Follow the Microdot installation tasks, specifically:

• Create 'microdot' folder on your RP2350
• Add __init__.py and microdot.py

Grab the ch9120server.py and add to the root of your device.

Try one of the examples!

Limitations

As the CH9120 is a transparent TCP to UART converter, there are several limitations that make it much less powerful compared to a full stack, specifically:

• Only one connection can be served at once
• The socket close event doesn't exist - e.g the Microdot video feed streaming example has odd behavour, or images need a content length header attached
• The peer IP cannot be determined
• You need to set up the CH9120 separately