I have found an exemple that describe "how to create a wireless serial link based on IEEE 802.15.4, using two sensor boards from a JN516x evaluation kit." (JN-AN-1178).
I have programmed my modules with the .bin provided ( AN1178_154_WUART_Coord_JN5168_NO_FLOW_CTRL.bin and AN1178_154_WUART_EndD_JN5168_NO_FLOW_CTRL.bin).
I know the firmware is running because the first led on DIO16 is flashing but the 2 modules do not associate each other.
PS: sorry for my bad english.