Advertising/Scanning Problems

[Yaroslav]

Issue is similar to devzone.nordicsemi.com/.../

I'm developing an application based on latest SoftDevice 130_1.0.0 and using two or more DevKits. My application starts advertising and scanning simultaneously with parameters:

	adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
	adv_params.p_peer_addr = NULL;                           			
	adv_params.fp          = BLE_GAP_ADV_FP_ANY;
	adv_params.interval    = BLE_GAP_ADV_INTERVAL_MIN;
	adv_params.timeout     = BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED;

	if(adv_mode == LIGO_ADVERT_MODE_CONNECTED)
	{		
		adv_params.type		= BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
		adv_params.interval	= BLE_GAP_ADV_NONCON_INTERVAL_MIN;
	}

	scan_param.active = 0;
    scan_param.selective = 0;
    scan_param.p_whitelist = NULL;
    scan_param.timeout = 0;
    scan_param.interval = 0x03C0;		// 600 ms
    scan_param.window = 0x0140;		// 200 ms

Each board using LED indicates receiving advertise reports.

So, I've noticed next:

1. When I reset(or power on) two board at the same time - both boards don't indicate anything, it means there are no incoming advertising packets. Seems, nRF during scan doesn't advertise.

2. When I reset(or power on) two board at different time - they both work fine but after some time (adout 15-30 min) I see that advertising's appear much rarely up to total stopping receiving adv packets for few minutes and then I see advertise packets again.

3. When I set next scan interval = window, like:

   scan_param.interval = 0x03C0; // 600 ms scan_param.window = 0x03C0; // 600 ms I don't see any advertising using nRF MasterControlPanel for PC and/or for smartphone. Also both boards don't indicate anything.

4. When I start a app_timer() in advertising report handler I notice that scanning activity becomes worst - I can see indications very rare.

So, could you explain this behavior?

[Yaroslav]

1. Of course, device using one antenna and radio module can't transmit and receive at the same time. But I was sure that nRF can switch to advertising during scan window. My investigations shows me that nRF doesn't transmit data during scan window at all.

2. I understand this behavior but again question #1.

3. Yes, but it is not reproducible on S130_1.0.0.3 Alfa, but it is on S130_1.0.0 recently released