After few hours playing with Zigbee sniffer finally managed to get my old XBEE based device using standard API router firmware to communicate with new JN5168 based device and pass the payload data over to the connected PC.

Still not sure, but probably will create JN5168 firmware which will emulate XBee API (only functions I use) to keep compatibility with old devices and existing management software, and add new features to support my new custom JN5168 based end devices as well as standard ZigBee devices.