Send serial data to a specific Zigbee Node with HA (NXP Zigbee HA)
This can be achieved with the Data Transfer Functions from the Application Framework (AF) API of the ZigBee stack (See Page 164).


  The AF Data Transfer functions are used to request the transmission of data, in the form of an Application Protocol Data Unit (APDU), to one or more remote nodes.


For reference: https://community.nxp.com/thread/445724