JairajDange:
I tried Robin2 tutorial example SimpleTxAckPayload for the same single pir sensor i was nable to transfer data from master to slave but couldn't transfer from slave to master
Did you try my example without any changes and did it work?
If you did not, or if it did not work then get it working before you try anything more complex.
I wonder if your strncpy() code is correct I can't recall if you should copy 4 chars or 5 (including the terminating 0).
...R