#include <Wire.h>

const int slaveAddress = 8;

void setup() {
  Wire.begin();
  Serial.begin(9600);
  while (!Serial);
  Serial.println("Type a message and press Enter to send to slave:");
}

void loop() {
  if (Serial.available()) {
    String inputMessage = Serial.readStringUntil('\n'); // Read until Enter key
    inputMessage.trim(); // Remove any trailing newline or spaces

    if (inputMessage.length() > 0) {
      if (inputMessage.length() > 31) {
        Serial.println("Message too long! Max 31 chars.");
        return;
      }

      Wire.beginTransmission(slaveAddress);
      Wire.write(inputMessage.c_str()); // Send as bytes
      Wire.endTransmission();

      Serial.print("Sent to slave: ");
      Serial.println(inputMessage);
    }
  }
}