sd_power_system_off returns immediately and forces reset

Question

I hope this isn't a duplicate of another question. I searched on sd_power_system_off and didn't see anything exactly like this. 
 I'm creating a new project, based on ble_app_template from SDK 11.0.0 . So far, all I've done is tested to make sure my combination of services advertises correctly. It does, but I noticed via debug output that the application restarts regularly and I tracked it to the sleep_mode_enter call (due to advertising timeout) and sd_power_system_off. The latter call is made and immediately exits with error NRF_ERROR_SOC_POWER_OFF_SHOULD_NOT_RETURN. 
 What might cause this? 
 I'm attaching my main.c.
 main.c 
 ble_whts.c 
 ble_whts.h

Anders Strand · Accepted Answer

Hi. 
 The chip cannot be put in system_off when in Debug mode. It will most likely work when you run it without the debugger, but you should confirm this with a test. 
 -Anders 
 UPDATE 2016.10.14: 
 The chip will be put in emulated system off mode if in debug interface mode and calling sd_power_system_off() . This will lead to the CPU executing code after the call. Therefore it is recommended to add an infinite loop after going system off. See this and this post.

sd_power_system_off returns immediately and forces reset

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