RE: the two connect evt

Einar Thorsrud — Tue, 29 Mar 2022 13:23:16 GMT

Hi,

[quote user=""]1、I am wondering what is the difference between BLE_GAP_EVT_CONNECTED and NRF_BLE_SCAN_EVT_CONNECTED.[/quote]

You always get the BLE_GAP_EVT_CONNECTED event from the SoftDevice when a connection is established. If you are using the scan module, then you will also get the NRF_BLE_SCAN_EVT_CONNECTED event in this case (this is sent by the scan module when it sees the BLE_GAP_EVT_CONNECTED event). The latter is a scan module event, and the former is a normal Bluetooth event. You can search for these events in the SDK examples to see how they can be used.

[quote user=""]2、when a central want to connect to a specific slave, it will transmit a SCAN_REQ, and then what will happen, a BLE_GAP_EVT_CONNECTED event or NRF_BLE_SCAN_EVT_CONNECTED?[/quote]

Neither. A scan request is not related to establishing a connection. That is just a way to request a scan response packet, which is sort of an extra advertising packet.