BLE Scanning not working

[Shishir]

Hi

I am trying BLE multirole application ble_app_multirole_lesc from the SDK 13.0.0. I am using nRf52832 DK along with GCC toolchain. For debugging I am using Segger RTT and have added some of my own debug string to capture which events I am receiving. Log of the same is as below. The events are as per the peripheral role of the device where my laptop scans and connects with the device successfully. Problem lies with central role where my expectation is to scan for device name declared in variable m_target_periph_name = and to be able to initiate connection from device to laptop. As per the example code scan_start function is supposed to start the scan and event BLE_GAP_EVT_ADV_REPORT is expected which in my case is not being generated.

There were couple of instances when I left my setup for long period and after ~30mins suddenly this event started to be seen but still connection was not attempted.

What should I make sure that I see this event as soon as application and scanning starts ? How to make sure that scanning is working as expected in background ?

APP:INFO:Initializing nrf_crypto.
APP:INFO:Initialized nrf_crypto.
APP:INFO:Generating key-pair
APP:INFO:After generating key-pair
APP:INFO:Converting to raw type
APP:INFO:After Converting to raw type
APP:INFO:Scanning err_code [0]
APP:INFO:Advertising
APP:INFO:LE Secure Connections example started.
APP:INFO:PERIPHERAL: Event [16]
APP:INFO:PERIPHERAL: connected
APP:INFO:PERIPHERAL: Event [33]
APP:INFO:PERIPHERAL: Event [34]
APP:INFO:CENTRAL: BLE_GAP_EVT_SEC_PARAMS_REQUEST
APP:INFO:PERIPHERAL: Event [19]
APP:INFO:CENTRAL: BLE_GAP_EVT_AUTH_STATUS: status=0x88 bond=0x0 lv4: 0 kdist_own:0x43 kdist_peer:0x1
APP:INFO:PERIPHERAL: Event [25]
APP:INFO:PERIPHERAL: Event [17]
APP:INFO:PERIPHERAL: disconnected, reason 0x13
APP:INFO:PERIPHERAL: Event [16]
APP:INFO:PERIPHERAL: connected
APP:INFO:PERIPHERAL: Event [33]
APP:INFO:PERIPHERAL: Event [85]
APP:INFO:PERIPHERAL: Event [34]
APP:INFO:PERIPHERAL: Event [18]
APP:INFO:PERIPHERAL: Event [82]
APP:INFO:PERIPHERAL: Event [80]
APP:INFO:PERIPHERAL: Event [18]
APP:INFO:PERIPHERAL: Event [18]
APP:INFO:PERIPHERAL: Event [17]
APP:INFO:PERIPHERAL: disconnected, reason 0x13

Shishir

[Petter Myhre]

So the laptop is able to connect as central. But when the laptop is a peripheral and advertises the nrf is not able to scan its advertisements? Also, I would test them separately first, does it work if you don't advertise/have a connection at the same time as you scan?

[Shishir]

Yes Petter, Laptop as central is able to connect with my dev kit as peripheral. All the logs under Peripheral tag are from on_ble_peripheral_evt and as expected. It's while my laptop is advertising and infact I have 3-4 others devices including my cellphone even advertising I am not getting any BLE_GAP_EVT_ADV_REPORT events.

I'll comment out ble_advertising_start and retry as you suggested and share my findings ASAP.

[Shishir]

Hi Petter commented out ble_advertising_start from the example. Below is all the log I am getting. All this time my laptop and my cellphone can discover each other. Tried both sets of below settings as wel.

#define SCAN_INTERVAL 960//160
#define SCAN_TIMEOUT 0
#define SCAN_WINDOW 480//80

APP:INFO:Initializing nrf_crypto.
APP:INFO:Initialized nrf_crypto.
APP:INFO:Generating key-pair
APP:INFO:After generating key-pair
APP:INFO:Converting to raw type
APP:INFO:After Converting to raw type
APP:INFO:Scanning err_code [0]
APP:INFO:LE Secure Connections example started.

[Petter Myhre]

Sounds very strange. What if you try for ble_app_hrs_c example? Just add a printf when you get the BLE_GAP_EVT_ADV_REPORT event in on_ble_evt()