//  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, 8 Mhz internal clock, Network NODE 1 first trial

#include <SoftwareSerial.h>

#define rxPin 2                             // Pin 2 as INPUT receives request from the Bridge board
#define txPin 0                             // Pin 0 as OUTPUT transmits data to the Bridge board

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

const char node = '1';                      // Network address of this NODE1 board

const int ledPin = 2;                       // Green LED is in OUTPUT pin 2
char incomingbyte;                          // Variable to store the data (NODE1)

void setup() {

  pinMode(ledPin, OUTPUT);                  // Green LED is OUTPUT
  pinMode(rxPin, INPUT);                    // RX is INPUT
  
  mySerial.begin(9600);                     // Open Serial communication between NODEs and BRIDGE (data rate 9600 bps)
}

void loop() {
  
    while(mySerial.available())             // Waits for node to be available and response through serial
     {
          incomingbyte = mySerial.read();   // Read the incoming byte
          
           if(incomingbyte == '1') {
              pinMode(txPin, OUTPUT);       // Change TX as OUPUT to send a signal to the BRIDGE
             
              mySerial.print('1');
         
              digitalWrite(ledPin, LOW);    // Blink the green LED as a sign that the request is received
              delay(1000);
              digitalWrite(ledPin, HIGH);
              delay(500);
              digitalWrite(ledPin, LOW);
              delay(500);
              digitalWrite(ledPin, HIGH);
              delay(500);
              digitalWrite(ledPin, LOW);
              delay(200);
              digitalWrite(ledPin, HIGH);

              pinMode(txPin, INPUT);        // Change TX back as INUPUT to listen a request of the BRIDGE
           }   
          else {
           }
      }
}