About device peer manager

[kenyon]

SDK:11.0
Example：ble_app_hrs\pca10040\ s132_with_dfu

Hi 

The product we are selling wants to add some new features and can only be upgraded through DFU. But we currently don't have enough IROM to build new features. Then we realized that our peer manager feature was not being used, and we could save a lot of space(aboout 1kb) if we didn't use it. Can I disable device_manager_init() directly?

/**@brief Function for the Device Manager initialization.
 *
 * @param[in] erase_bonds  Indicates whether bonding information should be cleared from
 *                         persistent storage during initialization of the Device Manager.
 */
static void device_manager_init(bool erase_bonds)
{
    uint32_t               err_code;
    dm_init_param_t        init_param = {.clear_persistent_data = erase_bonds};
    dm_application_param_t register_param;

    // Initialize persistent storage module.
    err_code = pstorage_init();
    APP_ERROR_CHECK(err_code);

    err_code = dm_init(&init_param);
    APP_ERROR_CHECK(err_code);

    memset(&register_param.sec_param, 0, sizeof(ble_gap_sec_params_t));

    register_param.sec_param.bond         = SEC_PARAM_BOND;
    register_param.sec_param.mitm         = SEC_PARAM_MITM;
    register_param.sec_param.lesc         = SEC_PARAM_LESC;
    register_param.sec_param.keypress     = SEC_PARAM_KEYPRESS;
    register_param.sec_param.io_caps      = SEC_PARAM_IO_CAPABILITIES;
    register_param.sec_param.oob          = SEC_PARAM_OOB;
    register_param.sec_param.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
    register_param.sec_param.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
    register_param.evt_handler            = device_manager_evt_handler;
    register_param.service_type           = DM_PROTOCOL_CNTXT_GATT_SRVR_ID;

    err_code = dm_register(&m_app_handle, &register_param);
    APP_ERROR_CHECK(err_code);
}

Best regard
Kenyon

[Simonr]

Hi again

Glad you were able to get it back to a working state! As long as you don't do pairing/bonding of your connection, or have to manage multiple connections on the nRF device, it should be fine to remove the device/peer manager from your application.

Best regards,

Simon

[XiongYin]

Hi Simonr,

Regard "manage multiple connections " you mentioned:

We may support more than 1 connection on the nRF device (like: 2 peripheral connections for 2 phones, still no pairing/bonding), is this still fine to remove the device/peer manager?

Thanks!

[Hieu]

Hi XiongYin,

Device Manager or Peer Manager help managing paired and bonded peers. If you don't plan to have pairing or bonding, it is fine to remove those libraries.

Hieu