Cannot restart advertising in Beacon example

Question

Hey guys! 
 I face a problem that I have not been able to solve since several days... 
 I would like to send only one advertising frame every 4 seconds. I do not want to use connectable mode since I only need to send few values periodically, and I do not need to get any answers. So I have modified "ble beacon example", which appears to be the best starting point for my project. 
 I have set interval and timeout like this: 
 #define APP_CFG_NON_CONN_ADV_TIMEOUT 1
#define NON_CONNECTABLE_ADV_INTERVAL MSEC_TO_UNITS(2000, UNIT_0_625_MS)
 
 Normally I send a frame every 2 seconds, but with the timeout of 1sec, I only send 1 frame and the advertising stops. 
 I have set a timer every 4 seconds that launches the function "advertising_start()". 
 It works once. In the main loop, I launch once "avertising_init()" and when the timer reaches 4 seconds, it launches "advertising_start()". However, the next 4 seconds, my board seems to reset.
I have enabled nRF_log, and when the timer uses again "advertising_start()" I can see: 
 APP_ERROR:ERROR:Fatal
 
 Considering this post , I am stopping correctly the advertising.
And with this one , it seems that I am restarting it correctly. 
 I need help to find what I am doing wrong... :D 
 Thanks for your help!

AmbystomaLabs · Accepted Answer

Oh, I get it.
I've always used: 
 err_code = sd_ble_gap_adv_stop();
 APP_ERROR_CHECK(err_code);
 
 And then: 
 err_code = sd_ble_gap_adv_start(&m_adv_params);
 APP_ERROR_CHECK(err_code);
 
 So, far it's worked every time I have used it. Though if you are on a newer SDK, then the API's might have changed. But if they did, Nordic are pretty good at describing the API changes in the release notes. 
 But from experience, I can tell you that the code executed to stop and start advertising is vastly more power hungry than a few beacons. So you need to be turning it off for quite a while to make it worth it on power consumption.