Controlling pyboard with other pyboard

[Adixylian]

Greetings

Is it possible?
I have succesfully made UART, I2C and SPI comm with other objects, and between pyb themselves.
Now, as I am using 4 different pyboards that communicate between themselves, I have tu plug-in 4 different USBs and opet 4 repls at the same time... Is it possible to simply control pyboard with other pyboard via, for ex, UART communication?
Probably it is possible, so I need to know which protocol would be used? How does the pyb communicate via usb? So I can make the same thing via simple UART

I am talking about "virtual repl", not something like "If I raise X2 to "1", you do that. If I put "Y2" to "0", you do something else..."

Please, help me If I make it possible, I'll upload the class on the github
Thank you!

[dhylands]

With rshell, you still need to plug in all 4 boards, but you can manipulate them all from the same rshell session. rshell has the notion of a board name, and if you create a board.py file on each board and they contain a line:

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name = 'name1'

then you will be able to use /name1/flash to refer to the filesystem on the name1 board.
You can still only get to one repl at a time. The repl command accepts an optional board name argument, so you can use:

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repl name1

to enter the repl on the name1 board.

Eventually, I'd like to revamp the underlying protool rshell uses to be more packet based, and at that time it would make sense to allow packet forwarding or something so that you could connect to a single pyboard and communicate with others.

[Adixylian]

I'll give it a try, thanks!

[TravisT]

If you were not looking for REPL support, RS485 or CAN would be good multi-drop communication methods.