hub-xbee-code.ino

#include <SoftwareSerial.h> // Software based UART port to use Zigbee module
int a = 1;
float hum = 0, temp = 0;  // Float Variable to store Temperature and Humidity
SoftwareSerial xbee(3, 2); // RX, TX

void setup() //One time preloading function
{   
Serial.begin(9600); // Hardware Serial initialization to be connected to a bluetooth module or PC
xbee.begin(2400);  // Software Serial initialization at 2400 Baud rate to communicate with zigbee 
}

void loop() // Continous loop
{
 xbee.print(a);   // Sends (a) with "!" to Xbee -> "1!" Requests temperature data and vice versa
 xbee.println("!");
 while(xbee.available() > 0) //Checks is any data has been recieved from zigbee. 
  { 
    char aChar = xbee.read();  //reading the value from the Xbee serial port
      if(aChar == 33)  //If the first character is 33 ie) ! in ASCII
      {
        xbee.flush();  // Clear the buffer and 
        aChar = NULL;
       }
      if(aChar >= 100) // If it is more than 100 or random ASCII character flush the data
       {
        xbee.flush();
        aChar = NULL;
       }
  Serial.print(aChar); //Printing the Read value 
  }
  if(a == 3) // if a = 3 create new line or end of one set of data transmission
  {
    Serial.println(); //New line print
  }
  else 
  {
    Serial.print(","); // if a not 3 then add "," 
  }
  if(a> 3) // after a > 3 print the AES encryted data to xbee
  {
    a =1; // initialize a = 1 back
    xbee.print("!f+F8YW+9W3+Cg0S1NVBexycQxz32biWTmzVsxO48+fk=!");
  }
  delay(100); // Wait for few ms for this to happen
  xbee.flush(); // flush any data in Xbee serial port
  a=a+1;  //Increment data
  
  if(Serial.available()); // Check if any data is sent from Hardware serial port
  {
    
    int r = Serial.parseInt(); // Recieving any integer data
    if(r== 1)  // if recieved data is 1. Send 4! which turns the LED on the Node.
    {
      xbee.print(4);
      xbee.print("!");
      delay(100);
     
       
    }
      if(r== 2)// if recieved data is 2. Send 5! which turns the LED off the Node.
    {
      xbee.print(5);
      xbee.print("!");
      
    }
  }
}