Receiving data in Zigbee

Projects General Guidance
1

Hi,
I want to receive two numbers first and the two character next through receiving zigbee from sending zigbee. Can anyone help me with the code:

This is the receiving Zigbee code

void loop() 
{                      
   if(Serial3.available() > 0)
   { 
      Serial.println("Entered");
       data = Serial3.read();
       Num = Serial3.read();
       if(data == 'S' || data == 'L' || data == 'R' || data == 'T')
       {
         Serial.println(data);
         SD_Follow(data);
       }
       else if (Num == X_S1)
         X_S = X_S1;
       else if (Num == Y_S1)
        Y_S = Y_S1;
    
   Serial.println("Recieved");
   Serial.println(X_S);
   Serial.println(Y_S);
 }

In this code I can receive the character but not the numbers.

2

It's not clear from the short code extract how you have defined the items of data you are transmitting/receiving but if these are of different data types, you should pack the data items into a struct eg

struct myDataRecord {
  int Num;
  char data;
} ;

and transmit/receive it as one block.
Consecutive serial reads is likely to be unreliable.