How to Scaning Other Bluetooth Device Using nRF52833

[Huseyin T.]

Hi everyone,

I am new here. I wanna develope a module using nrf52833 for observing other bluetooth device like "nrf Connect For Desktop-> nrf connect for desktop bluetooth low energy standalone App" attached image. I have tried to run example projects(ble_app_uart_c_pca10100_s122 ) but i couldnt find i wanted. The codes waiting command from user as i understand. i am using nrf52 first time. Which example project is more similar to what I want? Many thanks.

[Karl Ylvisaker]

Hello,

Could you elaborate on your intentions? Is your intentions to make an application that just lists all scanned advertisements, or do you intend to make something similar to the nRF Sniffer tool?

Best regards,
Karl

[Huseyin T.]

Hello Karl,

I wanna just listting active device.

[Karl Ylvisaker]

Great, I am glad to hear that! :) 

Please give this a try, and do not hesitate to let me know if you should encounter any issues or questions along the way.

Best regards,
Karl

[Huseyin T.]

Hi Again,

I have edited scan_init function(removed scan filter) after that i have compiled and ran the project(ble_app_uart_c) and then i gave input(20 byte) from mobaxterm. the module printed logs as shown in below figure.  how can i see active device log?

[Karl Ylvisaker]

Hello,

I am glad to read that you are progressing with your design!
You will also need to remove the NUS connection functionality since this is not going to be used in your case.
Additionally, you will need to modify the 'scan_evt_handler' to print the device ID of the scanned devices from the scan reports, you should then start to see scan reports about the different devices in the vicinity.

Best regards,
Karl

[Huseyin T.]

Hi again,

I can read scan data into scan_event_handler at the moment and you reply my question. I will try a create a list(for not reply same devices) tomorrow. 

[Karl Ylvisaker]

Hello,

I am glad to hear that you are now seeing the scan reports! :) 
The next step then is to set up a list (I would create a struct to contain device ID's + timestamps) and the RTC, and then implement periodic check of the list to empty out devices who's timestamp exceed your defined threshold.

Best regards,
Karl

[Huseyin T.]

Hi again,

how can i  saperate devices according to its type(phone or peripheral). I am reading device id from "p_scan_evt->params.p_whitelist_adv_report ->peer_addr.addr". I have added a image shown device params below.

[Huseyin T.]

hi again,

Mr Karl Ylvisaker  i couldn't find any pc or mobile phone during ble scaning with nrf but when i was scanning ble device with my mobile phone i can find all devices. How can i find or connect to pc or mobile phone.

[Karl Ylvisaker]

Hello again,

Thank you for your patience with this - I have been out of office due to the national easter holiday here in Norway, but now I am back.

Huseyin T. said:

i couldn't find any pc or mobile phone during ble scaning with nrf but when i was scanning ble device with my mobile phone i can find all devices. How can i find or connect to pc or mobile phone.

Could you confirm that you had the phone and PC configured as an advertising central while you were scanning for them?
The default of PCs and smartphones is to be a central, and so when you select the native 'pair a new device' option it will begin to scan for advertising packets from the other device. Since a scanner only receives radio communication, and never transmitts any of its own, it will not be possible to find scanners that are active (it is not possible to 'scan for scanners'), and so you need to explicitly configure the smartphone or pc to be a peripheral / to be advertising. You can do this by using the nRF Connect application, for instance.

Best regards,
Karl