Connecting the BLE device to a phone/App with highest signal strength

[GK]

Dear Sir,

I am working on the following scenario.

I have BLE device ( SDK 15 and softdevice s132). It is advertising for specific duration.

There are different phones at different distances from the BLE device.

There will be multiple requests coming to the BLE device to establish connection. I want the BLE device to connect the phone with highest signal strength?

Is it possible to do handle such a scenario with SDK15 and softdevice s132?

Please guide me on this.

Thanking you.

[Jared]

Hi

I don't see any reasons for why it shouldn't be possible. You can try fhe following:

1. Advertise in NON-CONNECTABLE mode, with scan response and advertise until a phone asks for a scan request

2. The p_ble_evt->evt.gap_evt.params.scan_req_report.rssi variable gets populated with the RSSI once the phone has sent a scan request package. 

3. Repeat Step 1-2 until you have covered all relevant phones. Make a Whitelist that contain only the phone with the highest RSSI

4. Set the phone in connectable mode and scan only for devices in your whitelist with a filter policy

I reccomend that you read our tutorials on advertising and central: 

Central: https://devzone.nordicsemi.com/tutorials/b/bluetooth-low-energy/posts/ble-central-tutorial

Advertising: https://devzone.nordicsemi.com/tutorials/b/bluetooth-low-energy/posts/ble-advertising-a-beginners-tutorial

Good Luck

Jared 

[GK]

HI,

You mentioned the following.

3. Repeat Step 1-2 until you have covered all relevant phones. Make a Whitelist that contain only the phone with the highest RSSI

4. Set the phone in connectable mode and scan only for devices in your whitelist with a filter policy

Here once we create the whitelist  with the peer address of the phone with highest rssi signal, we need to advertise with the whitelist using the function "ble_advertising_whitelist_reply" Am I correct?

I have got stuck on this for long time.

Please help in resolving this.

Thanking you in advance.