Need some advices about comunication ...

[Donpi]

Hello,

I'm actually designing a sort of tool changer (it's more like a filament exchanger, as Prusa does)

Now everything becomes a little too complicated to be controlled only with the gcode.
So I'm looking for a way to communicate with an arduino to simplify the operation.

I found the M260 command that allows to send data through the I2C channel.
But I did not find a way to stop the script until I received a signal. It seems that the M260 command is also receiving, but I do not understand the exact function.

Maybe somone can send a gcode sample with the waiting over the I2C channel ?
Or juste someone give me some hints?

Thank you

Ps: Sorry for my bad english ...