/nordic/nordic-blog/b/blog/posts/one-minute-to-understand-ble-connection-data-packa1.Profile During connection procedure of BLE, there are three packages: SCAN_REQ, SCAN_RSP 和 CONNECT_REQ。 SCAN_REQ： Scan request, issued by MASTER DEVICE, send to SLAVE DEVICE，sent by the Link Layer in the Scanning State, received by a Link Layer ien-USTelligent Community 13 Non-Production