Timeout when I try to read the descriptor

RE: Timeout when I try to read the descriptor

Moe — Thu, 18 Oct 2018 09:46:38 GMT

OK I found a mistake I made. The descriptor_add and the characteristic_add were in the wrong order.

Thank you for the responses

RE: Timeout when I try to read the descriptor

bjorn-spockeli — Wed, 17 Oct 2018 14:59:44 GMT

HI Moe,

NRF_ERROR_INVALID_STATE(0x08) is Invalid state to perform operation, a characteristic context is required. So I suspect that you're not passing the right handle to the descriptor_add() function.

Please post the entire ble_lbs_init() function so that I can check that you're using the correct handle.

Best regards

Bjørn

RE: Timeout when I try to read the descriptor

Moe — Tue, 16 Oct 2018 14:07:43 GMT

The error is comming from the function sd_ble_gatts_descriptor_add. Unfortunately I'm not able to specify it more, because I can't see in this function.

RE: Timeout when I try to read the descriptor

bjorn-spockeli — Tue, 16 Oct 2018 11:14:05 GMT

Are you able to see on the call stack where in descriptor_add the 0x08 error originates from?

RE: Timeout when I try to read the descriptor

Moe — Mon, 15 Oct 2018 08:06:26 GMT

Hi bjorn,

Thank you for the fast response. When I implement your code the descriptor_add function returns a 8 as error code and the Program stops. The Log doesn't says anything unusual. While Compiling I only get a warning for mixing types in your line 23 (desc_params.read_access = 1;) but this can be fixed with SEC_OPEN (what is the same).

RE: Timeout when I try to read the descriptor

bjorn-spockeli — Fri, 12 Oct 2018 13:15:18 GMT

Hi Moritz,

You need to give the descriptor a UUID, a own handle and initialize it with the correct parameters

    // Add descriptor UUID to top off ble_lbs.h
    #define LBS_UUID_LED_DESC    0x1526
    
    // Modify ble_lbs_s struct in ble_lbs.h
    struct ble_lbs_s
    {
    uint16_t                    service_handle;      /**< Handle of LED Button Service (as provided by the BLE stack). */
    ble_gatts_char_handles_t    led_char_handles;    /**< Handles related to the LED Characteristic. */
    ble_gatts_char_handles_t    button_char_handles; /**< Handles related to the Button Characteristic. */
    uint8_t                     uuid_type;           /**< UUID type for the LED Button Service. */
    ble_lbs_led_write_handler_t led_write_handler;   /**< Event handler to be called when the LED Characteristic is written. */
    // Add handle for descriptor in the LBS struct
    uint16_t                    desc_handle;         
    };

    
    // Add this code below the led_char_add in ble_lbs_init()
    static uint8_t desc[] = "Hello";
    ble_add_descr_params_t desc_params ={0};
    desc_params.uuid = LBS_UUID_LED_DESC;
    desc_params.uuid_type = p_lbs->uuid_type;
    desc_params.is_value_user = false;
    desc_params.read_access = 1;
    desc_params.init_len = 0;
    desc_params.max_len = sizeof(desc);
    desc_params.p_value = desc;

    err_code= descriptor_add(p_lbs->led_char_handles.value_handle, &desc_params, &p_lbs->desc_handle);
    VERIFY_SUCCESS(err_code);