Central Multilink: how to add custom characteristic uuid?

[Gandalf]

Hi,

I'm using Central multilink example to connect with our Custom Peripheral sensors.
I'm using board PCA10040, nRF52832, SDK_14.2.0, s132.

Sensors have a custom service (UUID 128 bit) with 4 custom characteristics (UUID 128 bit) and I know all these UUID of service and characteristics.

From the Central multilink example I used the function "ble_lbs_c_init" where I modified it to set our SERVICE_UUIDBASE of the custom service of the sensor.
In this case, Do I need to add something else regarding the 4 custom characteristics?

uint32_t ble_lbs_c_init(ble_lbs_c_t * p_ble_lbs_c, ble_lbs_c_init_t * p_ble_lbs_c_init)
{
    uint32_t      err_code;
    ble_uuid_t    lbs_uuid;
    ble_uuid128_t lbs_base_uuid = {LBS_UUID_BASE};

    VERIFY_PARAM_NOT_NULL(p_ble_lbs_c);
    VERIFY_PARAM_NOT_NULL(p_ble_lbs_c_init);
    VERIFY_PARAM_NOT_NULL(p_ble_lbs_c_init->evt_handler);

    p_ble_lbs_c->peer_lbs_db.button_cccd_handle = BLE_GATT_HANDLE_INVALID;
    p_ble_lbs_c->peer_lbs_db.button_handle      = BLE_GATT_HANDLE_INVALID;
    p_ble_lbs_c->peer_lbs_db.led_handle         = BLE_GATT_HANDLE_INVALID;
    p_ble_lbs_c->conn_handle                    = BLE_CONN_HANDLE_INVALID;
    p_ble_lbs_c->evt_handler                    = p_ble_lbs_c_init->evt_handler;

    err_code = sd_ble_uuid_vs_add(&lbs_base_uuid, &p_ble_lbs_c->uuid_type);
    if (err_code != NRF_SUCCESS)
    {
        return err_code;
    }
    VERIFY_SUCCESS(err_code);

    lbs_uuid.type = p_ble_lbs_c->uuid_type;
    lbs_uuid.uuid = LBS_UUID_SERVICE;

    return ble_db_discovery_evt_register(&lbs_uuid);
}

Because I'm able to connect with sensors but when I receive the event BLE_DB_DISCOVERY_COMPLETE (function ble_lbs_on_db_disc_evt), I don't read the uuid of the 4 custom characteristics but I read characteristic.uuid.uuid = 0x00.

Please could someone help me please?

[ketil]

Hi Gandalf,

Custom services and characteristics can be difficult to understand and work with. I think everything you need to solve your question is answered in the Custom Service Tutorial. Let me know if you can't figure it out after reading the tutorial and I will take a closer look.

Ketil

[Gandalf]

Hi Ketil,

thank you for your answer, but is this tutorial referred to peripheral side?
I'm working side "multilink central" and I already have a working sensor to connect with.

I need to discover the custom sensor profile but I only get characteristic.uuid.uuid = 0x00 when I receive the event BLE_DB_DISCOVERY_COMPLETE.

The custom sensor profile consist of 1 custom service at128bits and "4 custom characteristics at 128bits". Each characteristic has different uuid at 128bits even from custom service uuid at 128bit.

Do I need to add something else regarding the 4 custom characteristics at 128 bits inside ble_lbs_c_init or somewhere else?

Thank you in advance.

Best regards

[ketil]

Hi,

My bad. I will need to look further into this. Will let you know once I figure it out.

Ketil

 

[ketil]

Hi again,

Have you added the UUIDs for your characteristics in ble_lbs_on_db_disc_evt? If not the central will look for the UUIDs of the Blinky LED and Button characteristics. 

Ketil

[Gandalf]

Hi,

yes I modified ble_lbs_on_db_disc_evt it but the problem is I'm reading characteristic.uuid.uuid = 0x00 and characteristic.uuid.type = 0x00  when I receive the event BLE_DB_DISCOVERY_COMPLETE. This is probably because I didn't set the configuration properly  of the 4 UUIDs at 128bits of characteristics.

Do I need to use the sd_ble_uuid_vs_add to add the 4 UUIDs at 128bits characteristics? If yes, how should I do it?
Thank you in advance.