Function esp_idf_sys::esp_ble_gap_start_scanning

pub unsafe extern "C" fn esp_ble_gap_start_scanning(
    duration: u32,
) -> esp_err_t

@brief This procedure keep the device scanning the peer device which advertising on the air

@param[in] duration: Keeping the scanning time, the unit is second.

@return - ESP_OK : success - other : failed