RE: Scan / Connection Request

gritten — Thu, 05 Dec 2019 13:56:27 GMT

Kenneth,

Thanks! Will share with customer and keep you posted.

Gene

RE: Scan / Connection Request

Kenneth — Thu, 05 Dec 2019 13:54:14 GMT

Hi Gene,

So you simply call sd_ble_gap_scan_start() to start receiving advertisement reports. Once you want to connect to a specific peer based on the received advertisment report you call sd_ble_gap_connect(). For both api calls you define a set of parameters, one is the timeout:

uint16_t              timeout;                    /**< Scan timeout in 10 ms units. @sa BLE_GAP_SCAN_TIMEOUT. */

On BLE_GAP_EVT_TIMEOUT or BLE_GAP_EVT_CONNECTED, you need to call sd_ble_gap_scan_start() again.

If you know the advertisement interval, then you can time the call to the sd_ble_gap_connect(), such that if the advertisment interval is 100ms, then possible wait 95ms before calling sd_ble_gap_connect() with a 20ms timeout. It's not possible with accurate timing, since the BLE spec mandate a 10ms random delay on the advertisment intervals.

Best regards,
Kenneth