Hi Mariusz,
There is no response to Image notify command. After image notify the client should send query image request.
Some recommendations:
-Delete the OTA Server form the JN-AN-1216
-Take as reference the JN-AN-1218, Nonetheless, you have to add the app_ota_client.c and delete the server files.
-Use the v1.bin as OTA Client and change the pertaining to OTA for Makefile, search for OTA flag
-Changes source and header files search for CLD_OTA.
Regards,
Mario