//  Week 15 - Networking and Communications
//  ATtiny44A board, 8 Mhz internal clock
//  Network node 4
//
//  Author: Jari Uusitalo

#include <SoftwareSerial.h>
SoftwareSerial mySerial(0, 1); // RX, TX

const char node = '4'; // network addres
const int ext_led = 3;

int incomingByte;

void setup() {
  mySerial.begin(9600);
  pinMode(ext_led, OUTPUT);
  pinMode(1, INPUT);
  digitalWrite(ext_led, HIGH);
}

void loop() {
  if (mySerial.available() > 0) {
    digitalWrite(ext_led, LOW);
    delay(200);
    digitalWrite(ext_led, HIGH);
    delay(200);
    incomingByte = mySerial.read();
    if (incomingByte == node) {
      digitalWrite(ext_led, LOW);    
      pinMode(1, OUTPUT); // open line to write
      mySerial.print("node ");  
      mySerial.println(node);  
      pinMode(1, INPUT);
      delay(200);
      digitalWrite(ext_led, HIGH);      
    }
  }
}