scanning and decryption of data

[Naralasetty Praneeth]

I had two nRF52832 where one broadcasts with encrypted data of advertising beacon info and another nRF52832 should only scan without connecting and should decrypt the data of beacon which is broadcasting.

for that what should i do?

please give me any sample code if available

[Simon]

Take a look at these threads:

• https://devzone.nordicsemi.com/f/nordic-q-a/45470/encryption-and-decryption-of-advertising-data
• https://devzone.nordicsemi.com/f/nordic-q-a/37886/how-to-encrypt-and-decrypt-ble-advertising-data
• https://devzone.nordicsemi.com/f/nordic-q-a/38329/related-to-ble-advertising-encryption-and-decryption

If the provided links didn't help you, or if anything is unclear, please ask.

Best regards,

Simon

[Naralasetty Praneeth]

Hi @Simon

ok with the decryption part but now my problem is mainly about the Scanning part

I need to scan the beacon's MAC address,UUID,Major,Minor,battery level etc the scanner should only scan beacons it should not get connected after detecting. 

Thank you

[Simon]

The links I provided you are not about connection. When connected the Peer Manger handles the encryption/decryption for you, but if you want to encrypt/decrypt the advertsing data you need to perform it yourself, and the links provided will show you how.

Take a look at the code provided in this thread, which shows how to encrypt and decrypt data.

Best regards,

Simon

[Naralasetty Praneeth]

Hi @Simon,

Now i got how to do the encryption and decryption part but now i need to scan upto 200 beacons with their UUID,Major,Minor,Battery level,rssi,etc.,

please give me if any code if available.

Thank you

[Naralasetty Praneeth]

Hi @Simon, 

please respond

[Simon]

I am currently on vacation, but will be back in office the 23.04 and will look into your question then

Best regards,

Simon

[Naralasetty Praneeth]

ok @Simon, 

[Simon]

I would recommend you to take a look at the Scanning Module (the ble_app_uart_c example uses this library), to get an understanding of how the scanning works. The function nrf_ble_scan_on_ble_evt(..) receives the BLE scan events, and the advertising packets is redirected to the function nrf_ble_scan_on_adv_report(..) where the contents of the packets is located at the address in p_adv_report.data.p_data. Here you can check the content of the advertising packets, like UUID, Major, Minor, RSSI and so on..

Best regards,

Simon

[Naralasetty Praneeth]

Simon said:

the advertising packets is redirected to the function nrf_ble_scan_on_adv_report(..) where the contents of the packets is located at the address in p_adv_report.data.p_data. Here you can check the content of the advertising packets, like UUID, Major, Minor, RSSI and so on..

can please give me that code which displays all these fields with MAC address also 

[Naralasetty Praneeth]

Hi @Simon, 

       case BLE_GAP_EVT_ADV_REPORT:
			
                        {
				NRF_LOG_INFO("Advertise received");
				scan_start();
                                

				
				memmove(uuid, p_gap_evt->params.adv_report.data.p_data, p_gap_evt->params.adv_report.data.len);
				
				NRF_LOG_INFO("UUID: %02x%02x%02x%02x%02x%02x", uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5]);
				
				NRF_LOG_INFO("TX_POWER: %02x", p_gap_evt->params.adv_report.tx_power);
				
				NRF_LOG_INFO("RSSI: %02x", p_gap_evt->params.adv_report.rssi);
                       
				
			} break;

i wrote this code for UUID,RSSI but what i do get MAC Address and MAJOR,MINOR Values?