Function esp_idf_sys::esp_ble_gap_register_callback

pub unsafe extern "C" fn esp_ble_gap_register_callback(
    callback: esp_gap_ble_cb_t,
) -> esp_err_t

@brief This function is called to occur gap event, such as scan result

@param[in] callback: callback function

@return - ESP_OK : success - other : failed