#include <Wire.h>

void receiveEvent(int bytes) {
  while (Wire.available()) {
    char c = Wire.read();
    Serial.print(c);
  }
  Serial.println();
}

void setup() {
  Serial.begin(115200);
  Wire.begin(0x08);                // RP2040 as slave at address 0x08
  Wire.onReceive(receiveEvent);   // Callback on data received
}

void loop() {
  // Nothing here – waiting for data
}