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int rxrelaypin[] = {2, 3, 4, 5, 6, 7}; // 2meter, 70cm, 23cm, 13cm, 9cm, 6cm relay output pins
int txrelaypin[] = {12, 13, A0, A1, A2, A3}; // 2meter, 70cm, 23cm, 13cm, 9cm, 6cm relay output pins
int transmitrelaypin = 9;
int pttbutton = 10;

long band1[2] = {144000, 146000};
long band2[2] = {430000, 440000};
long band3[2] = {1240000, 1300000};
long band4[2] = {2300000, 2450000};
long band5[2] = {3400000, 3475000};
long band6[2] = {5650000, 5850000};

unsigned long prevMillis = 0;
const long interval = 100;
int timeout = 0;
int incommingdata = 0;
String incoming_Serial;
long rxfreq = -1;
int ptt = -1;
int oldptt = 0;
int tx = 0;

void askfordata() {
  long currentMillis = millis();
  if (currentMillis - prevMillis >= interval) {
    prevMillis = currentMillis;
    Serial.print("FA;IF;");
  }
}

void Sendptt() {
  if(ptt == 0 && tx == 0) oldptt = 0;
  ptt = (digitalRead(pttbutton));
  if (ptt == 0 && oldptt == 0) {
    Serial.print("TX;");
    oldptt = 1;
  }
  if (ptt == 1 && oldptt == 1) {
    Serial.print("RX;");
    oldptt = 0 ;
  }
}

void recievedata() {
  if (Serial.available() > 0) {
    incoming_Serial=Serial.readString();
    if (incoming_Serial.startsWith("FA")) {
      int rxfreqpos = (incoming_Serial.indexOf('FA') +2);
      String rxfreqstring = (incoming_Serial.substring(rxfreqpos ,rxfreqpos + 7));
      rxfreq = rxfreqstring.toInt();
      int txpos = (incoming_Serial.indexOf('FA') +41);
      String txstring = incoming_Serial.substring(txpos, txpos + 1);
      tx = txstring.toInt();
      timeout = 0;
    }
  }
  else timeout ++;
  if (timeout > 500) rxfreq = -1;
}

void selectband() {
  if (tx == 0) {
    settxrelay(10);
    if (rxfreq >= band1[0] && rxfreq <= band1[1]) setrxrelay(0);
    else if (rxfreq >= band2[0] && rxfreq <= band2[1]) setrxrelay(1);
    else if (rxfreq >= band3[0] && rxfreq <= band3[1]) setrxrelay(2);
    else if (rxfreq >= band4[0] && rxfreq <= band4[1]) setrxrelay(3);
    else if (rxfreq >= band5[0] && rxfreq <= band5[1]) setrxrelay(4);
    else if (rxfreq >= band6[0] && rxfreq <= band6[1]) setrxrelay(5);
    else setrxrelay(10);
  }
  if (tx == 1) {
    setrxrelay(10);
    if (rxfreq >= band1[0] && rxfreq <= band1[1]) settxrelay(0);
    else if (rxfreq >= band2[0] && rxfreq <= band2[1]) settxrelay(1);
    else if (rxfreq >= band3[0] && rxfreq <= band3[1]) settxrelay(2);
    else if (rxfreq >= band4[0] && rxfreq <= band4[1]) settxrelay(3);
    else if (rxfreq >= band5[0] && rxfreq <= band5[1]) settxrelay(4);
    else if (rxfreq >= band6[0] && rxfreq <= band6[1]) settxrelay(5);
    else settxrelay(10);
  }   
}

void setrxrelay(int band) {
  for (int i =  0; i < 6;i++) {
    int relayoutput = 0;
    if ( i == band) relayoutput = 1;
    digitalWrite(rxrelaypin[i], relayoutput);
  }
  digitalWrite(transmitrelaypin, tx);
}

void settxrelay(int band) {
  for (int i =  0; i < 6;i++) {
    int relayoutput = 0;
    if ( i == band) relayoutput = 1;
    digitalWrite(txrelaypin[i], relayoutput);
  }
  digitalWrite(transmitrelaypin, tx);
}

void setup() {
  Serial.begin(19200);
  Serial.setTimeout(100);
  pinMode (transmitrelaypin, OUTPUT);
  pinMode (pttbutton, INPUT_PULLUP);
  for (int i =  0; i < 6;i++) pinMode (rxrelaypin[i], OUTPUT);
  for (int i =  0; i < 6;i++) pinMode (txrelaypin[i], OUTPUT);
}

void loop() {
  askfordata();
  recievedata();
  selectband();
  Sendptt();
}