[S2C]ATMY is read only and the tutorials I'm using is asking me change ATMY value.

MY parameter is 0 for coordinator node.

The tutorials I’m using are:
https://spin.atomicobject.com/2016/07/18/xbee-tutorial/

and

https://www.youtube.com/watch?v=vKVNmA8C6m8

I want both XBees to communicate.

Could anyone also suggest better resources and tutorials?

Faulty,

The MY command is only changeable on the 802.15.4 firmware versions. All of the others use a 64 bit address function which uses the Serial number High and Low for the Source address and the DL and DH functions for the destination address.

Eric
Digi Support