AMP.c

bool telSetbyStatus = true;
bool telMuteStatus = true;

bool paSetbyStatus = true;
bool paMuteStatus = true;

int telSetBy = A0;
int telMute = A1;

int paSetBy = 2;
int paMute = 3;

int lrRly1 = 4;
int lrRly2 = 5;

void setup() {

  pinMode(telSetBy, OUTPUT);
  pinMode(telMute, OUTPUT);
  pinMode(paSetBy, OUTPUT);
  pinMode(paMute, OUTPUT);
  pinMode(lrRly1, OUTPUT);
  pinMode(lrRly2, OUTPUT);

  digitalWrite(telSetBy, LOW);
  digitalWrite(telMute, LOW);
  digitalWrite(paSetBy, LOW);
  digitalWrite(paMute, HIGH);
  digitalWrite(lrRly1, LOW);
  digitalWrite(lrRly2, LOW);

  Serial.begin(9600);
  Serial.println("Ready");

}

void loop() {
  Serial.setTimeout('1');
  while (Serial.available()) {
    String data = Serial.readString();

    if (data.indexOf("telephone -e") >= 0) {
      telephonesSetBy();
    }

    if (data.indexOf("telephone -m") >= 0) {
      telephonesMute();
    }

    if (data.indexOf("public-address -e") >= 0) {
      publicAddressSetBy();
    }

    if (data.indexOf("public-address -m") >= 0) {
      publicAddressMute();
    }

  }

}

void telephonesSetBy() {
  if (telSetbyStatus == true) {
    digitalWrite(telSetBy, HIGH);
    telSetbyStatus = false;
    Serial.println("Telephone On");
  } else {
    digitalWrite(telSetBy, LOW);
    telSetbyStatus = true;
    Serial.println("Telephone Off");
  }
}

void telephonesMute() {
  if (telMuteStatus == true) {
    digitalWrite(telMute, HIGH);
    telMuteStatus = false;
    Serial.println("Telephone Unmuted");
  } else {
    digitalWrite(telMute, LOW);
    telMuteStatus = true;
    Serial.println("Telephone Muted");
  }
}

void publicAddressSetBy() {
  if (paSetbyStatus == true) {
    digitalWrite(paSetBy, HIGH);
    paSetbyStatus = false;
    Serial.println("PA On");
  } else {
    digitalWrite(paSetBy, LOW);
    paSetbyStatus = true;
    Serial.println("PA Off");
  }
}

void publicAddressMute() {
  if (paMuteStatus == true) {
    digitalWrite(paMute, LOW);
    paMuteStatus = false;
    Serial.println("PA Unmuted");
  } else {
    digitalWrite(paMute, HIGH);
    paMuteStatus = true;
    Serial.println("PA Muted");
  }
}