I2c slave onreceive

Wire.onReceive(handler)

// Registers a function to be called when a slave device receives
// a transmission from a master

// handler: the function to be called when the slave receives data;
// this should take a single int parameter (the number of bytes read
// from the master) and return nothing
// e.g.: void myHandler(int numBytes)

Source: arduino.cc

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