BLE Advertising doesn't stop after sd_power_system_off()

[DAneill]

Dear Nordic Developers!

When I call the sd_power_system_off() function to put the MCU to system OFF, after that I can still see the advertiser device in MasterControlPanel. Is it a normal behaviour? The case is the same, when I call sd_ble_gap_adv_stop() before sd_power_system_off().

How much could be the maximum current consumption when advertising is on at system OFF state?

Thank you for the help in advance!

Ps.: I use nRF51422-QFAA-E0 with S130, SDK 8.1.0 with BLE_ADV_MODE_FAST adv. config.

The image below is captured, when the device is already in system OFF.

Update1:

static void Enter_SleepMode_f(void) { uint32_t err_code;

nrf_gpio_cfg_sense_input(GPIO_BUTTON1, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_HIGH); 	// Wake up button

// Turn off all LEDs
nrf_gpio_pin_set(GPIO_LED1);
nrf_gpio_pin_set(GPIO_LED2);
nrf_gpio_pin_set(GPIO_LED3);
nrf_gpio_pin_set(GPIO_LED4);

nrf_gpio_pin_clear(GPIO_ENCAL);		// Disables the 3.3V feed of MCP6N11 and TLC272CD amplifiers

// Disable LPCOMP and its interrupts
NRF_LPCOMP->ENABLE = LPCOMP_ENABLE_ENABLE_Disabled;
sd_nvic_DisableIRQ(LPCOMP_IRQn);	
// Stops all application timers
app_timer_stop_all();
	
// Go to system-off mode (this function will not return; wakeup will cause a reset).
err_code = sd_power_system_off();
APP_ERROR_CHECK(err_code);

}

[Susheel Nuguru]

Are you sure that it is not the old values that are displayed? I mean that if advertiser stopped, then MCP will just stop updating its details, but you can still see the last updated value. If you clear screen, then MCP will start updating only for active advertisers. I normally understand the advertiser is not active when the received signal strength is not changing anymore (-51dB)

[DAneill]

I cleared the screen before took the capture, and the RSSI is changing, too, so the advertising is working (i guess)

[Petter Myhre]

Have you used the debugger to check that you actually get to sd_power_system_off()?

[DAneill]

Yes I used the debugger. My code goes to sd_power_system_off(), and after I Step into it, it goes to a Hardfault Handler. I don't do anything special, just what the examples use, too. I updated my thread with the programcode of my function which enters to system OFF mode.

[Eirik Midttun]

If the device is really in SYSTEM OFF mode then the radio is not functioning, so it should definitely not advertise. The real question here is why sd_power_system_off() does not put the device in SYSTEM OFF.