// Networking and Communications - UART Master Node
// Board: XIAO ESP32-C3
// TX = D4, RX = D5
// Sends commands to SLAVE01 to control a LED

#include <HardwareSerial.h>

#define TX_PIN D4
#define RX_PIN D5

HardwareSerial NodeSerial(1);

void setup() {
  Serial.begin(115200);
  delay(3000);

  NodeSerial.begin(9600, SERIAL_8N1, RX_PIN, TX_PIN);

  Serial.println("MASTER NODE READY");
  Serial.println("UART communication started");
  Serial.println("Sending commands to SLAVE01");
}

void loop() {
  Serial.println("Sending command: SLAVE01:ON");
  NodeSerial.println("SLAVE01:ON");
  delay(3000);

  while (NodeSerial.available()) {
    String response = NodeSerial.readStringUntil('\n');
    response.trim();
    Serial.print("Response from Slave: ");
    Serial.println(response);
  }

  Serial.println("Sending command: SLAVE01:OFF");
  NodeSerial.println("SLAVE01:OFF");
  delay(3000);

  while (NodeSerial.available()) {
    String response = NodeSerial.readStringUntil('\n');
    response.trim();
    Serial.print("Response from Slave: ");
    Serial.println(response);
  }
}