//  Week 15 - Networking and Communications
//  ATtiny44A board, 20 Mhz external clock
//  Network node 2
//
//  Author: Jari Uusitalo
//  Modified by Kati Pitkänen on May 31, 2018
//  ATtiny45 board, 16 Mhz internal clock, Network NODE 0

#include <SoftwareSerial.h>

#define rxPin A1                          // A1 as INPUT receives request from the Bridge board
#define txPin A2                          // A2 as OUTPUT transmits data to the Bridge board

SoftwareSerial mySerial(rxPin, txPin);    // Set up Serial Port RX, TX

const char node = '0';                    // Network address of this NODE0 board

const int ledPin = 13;                    // Green LED is in OUTPUT pin 13
int incomingbyte;                         // Variable to store the data (NODE0)

void setup() {

pinMode(ledPin, OUTPUT);                  // Green LED is OUTPUT
pinMode(rxPin, INPUT);                    // RX as INPUT

mySerial.begin(9600);                     // Start Serial between NODE and Bridge (data rate to 9600 bits per second)
}

void loop(){
    
      while(mySerial.available())         // Waits for node to be available and response through serial
      {
          incomingbyte = mySerial.read(); // Read the incoming byte
          
          if(incomingbyte == '0') {
              pinMode(txPin, OUTPUT);     // Change TX as OUPUT to send a signal to the Bridge board
        
              mySerial.print("This response is sent from the node: ");
              mySerial.print('0');
              mySerial.println(".");
              
              pinMode(txPin, INPUT);      // Change TX back as INUPUT to listen and receive a request of the BRIDGE
        
              digitalWrite(ledPin, HIGH); // Blink the green LED as a sign that the request is received
              delay(1000);
              digitalWrite(ledPin, LOW);
              delay(500);
              digitalWrite(ledPin, HIGH);
              delay(500);
              digitalWrite(ledPin, LOW);
              delay(500);
              digitalWrite(ledPin, HIGH);
              delay(200);
              digitalWrite(ledPin, LOW);             
          }

          else {
           }
      }
}