Read rssi on data received after connection in S120

RE: Read rssi on data received after connection in S120

sowmya — Wed, 02 Dec 2015 11:18:27 GMT

Thank you Ole for the support :)

RE: Read rssi on data received after connection in S120

Ole Bauck — Wed, 02 Dec 2015 11:17:02 GMT

Yes, the value is an int8_t (signed)

RE: Read rssi on data received after connection in S120

sowmya — Wed, 02 Dec 2015 11:05:22 GMT

It is working, thank you. And do I have to minus the RSSI value read from sd_ble_gap_rssi_get method? like if I am getting value = 0x9E, that points to 158, then do I have to do 158 - 256 = -98dBm to get the result in dBm ?

RE: Read rssi on data received after connection in S120

Ole Bauck — Wed, 02 Dec 2015 10:24:21 GMT

I tested calling sd_ble_gap_rssi_get(...) in BLE_GATTC_EVT_HVX event and it worked (only one connected peripheral). The RSSI is sampled when the radio is in RX and has been started, so i guess it does not matter if you read in the BLE_GAP_EVT_RSSI_CHANGED event or the BLE_GATTC_EVT_HVX event.

RE: Read rssi on data received after connection in S120

sowmya — Wed, 02 Dec 2015 04:43:48 GMT

I am calling at the connected event.

RE: Read rssi on data received after connection in S120

Ole Bauck — Tue, 01 Dec 2015 15:12:59 GMT

And you are calling sd_ble_gap_rssi_start(...) at the connected event or in the notification event?

RE: Read rssi on data received after connection in S120

sowmya — Tue, 01 Dec 2015 13:12:02 GMT

I want the RSSI data when I get notification event i.e., BLE_GATTC_EVT_HVX. Is it possible? I checked, but the RSSI field is 0 when I receive notification.

RE: Read rssi on data received after connection in S120

Ole Bauck — Tue, 01 Dec 2015 13:08:51 GMT

Yes, you can call sd_ble_gap_rssi_start(...) when getting BLE_GAP_EVT_CONNECTED event.

RE: Read rssi on data received after connection in S120

sowmya — Tue, 01 Dec 2015 12:40:36 GMT

Sorry I was checking with some other filed. Yes connection handles are different and I am able to get the RSSI for different slaves. But our application mainly depends on RSSI and can I get RSSI on the received data in central after connection?

RE: Read rssi on data received after connection in S120

Ole Bauck — Tue, 01 Dec 2015 12:21:47 GMT

The connection handles should be different. I just tested with the multilink example to be sure.

RE: Read rssi on data received after connection in S120

sowmya — Tue, 01 Dec 2015 09:34:53 GMT

Thank you Ole. Currently I am connecting 2 peripherals and started RSSI method on central, and it is assigning the same connection handle for both peripherals. So I planned to check by peer_address , but the peer address field is overridden by RSSI values since its in union. Is there any other way to get to know for which peripheral the RSSI belongs to?

RE: Read rssi on data received after connection in S120

Ole Bauck — Tue, 01 Dec 2015 09:30:47 GMT

The connection handle should be in p_gap_evt->conn_handle.

RE: Read rssi on data received after connection in S120

sowmya — Tue, 01 Dec 2015 04:51:54 GMT

Yes I am using the same method on peripheral device. But in Central device, after connecting multiple periperals, when I get RSSI_CHANGED event, it will be not having the information of the peripheral device. Can I get to which connection/slave the RSSI is?

RE: Read rssi on data received after connection in S120

Ole Bauck — Mon, 30 Nov 2015 09:45:24 GMT

sd_ble_gap_rssi_start(...) and sd_ble_gap_rssi_get(...) works in the same way for the central as for the peripheral.