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UART Man-in-the-middle with ESPHome? (lemmy.world)

submitted 2 years ago by vapeloki@lemmy.world to c/homeassistant@lemmy.world

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cross-posted from: https://lemmy.world/post/110673

Hey all,

i want to hack a portable AC. The devices communicates via UART between Mainboard and control unit (LCD and Buttons). As we still want to use the original controls, i had the idea to put an ESP32 in the middle of the communication (using UART2 for the mainboard and UART3 for the control board).

I don't want to reverse engineer the whole protocol, only the relevant parts. So, i need a way to forward all messages in both directions, to make this work as it should.

Has anybody done such a thing already? Or has any tips how to do it.

I'm fluent in C++, so there is not barrier here, but i am new to the codebase of ESPHome

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[–] wildbus8979@sh.itjust.works 5 points 2 years ago

You could probably use ESPHome or Tasmota serial port proxy for this ... Just connect to it using nc or something like that.

https://esphome.io/components/uart.html#debugging

https://github.com/thegroove/esphome-serial-server

https://tasmota.github.io/docs/Serial-to-TCP-Bridge/

Using ESPHome is probably the fastest path to something that works since you can use the serial server and/or debug mode to figure out the commands you want to read/write and write a config for those right away.