is there a tutorial of how to set up a second esp23 boad to a rpi. nose-red setup as in your smart home book
It is as easy as using a different topic for the other ESP32 board.
For example, you have board number 1 publishing on the following topic:
You can have the same exact setup for other boards, but you just need to use a different topic. For example:
Let me know if this helps.