It is reported that ZED of JN5169 has long front-porch period (RX is enabled) before polling (TX becomes activated) after ZED wakes up . Please refer to following snapshot in which the front-porch period is selected and highlighted as Orange/Amber.
Please use following way to decrease this long front-porch period :
1) add #include "mac_pib.h" in AN
2) add MAC_vPibSetMinBe(NULL, 1); in initial part of AN
The second parameter of MAC_vPibSetMinBe can be changed to 2,3...etc according to real environment ,