NRF_ERROR_FORBIDDEN occurs in sd_ble_gatts_characteristic_add.

Question

Hello. 
 It is developed using nrf52832 (S132 v7.0.1, SDK v17.0.0) as a peripheral device. 
 I'm trying to characteristically add BLE_UUID_GAP_CHARACTERISTIC_DEVICE_NAME and BLE_UUID_GAP_CHARACTERISTIC_APPEARANCE. 
 However, characteristic_add (sd_ble_gatts_characteristic_add) gives an NRF_ERROR_FORBIDDEN error. How can it be solved? 
 static uint16_t m_service_handle; /**< Handle of local service (as provided by the BLE stack).*/
static ble_gatts_char_handles_t m_char_handles[2]; /**< Handles of local characteristic (as provided by the BLE stack).*/


#define BLE_UUID_SERVICE_BASE {0xHH, 0xHH, 0xGG, 0xGG, 0xFF, 0xFF, 0xEE, 0xEE, 0xDD, 0xDD, 0xCC, 0xCC, 0xBB, 0xBB, 0xAA, 0xAA}
#define BLE_ADV_UUID_SERVICE 0xABCD
#define BLE_UUID_CHAR 0xEFGH

/**
 * @brief DEVICE NAME CHARACTERISTIC
 * 
 */
static ble_add_char_params_t char_device_name = 
{
 .uuid = BLE_UUID_GAP_CHARACTERISTIC_DEVICE_NAME,
 .uuid_type = 0x00,
 .max_len = 248,
 .init_len = 248,
 .p_init_value = NULL,
 .is_var_len = false,
 .char_props.read = 1,
 .read_access = SEC_OPEN,
};

/**
 * @brief APPEARANCE CHARACTERISTIC
 * 
 */
static ble_add_char_params_t char_appearance = 
{
 .uuid = BLE_UUID_GAP_CHARACTERISTIC_APPEARANCE,
 .uuid_type = 0x00,
 .max_len = 2,
 .init_len = 2,
 .is_var_len = false,
 .char_props.read = 1,
 .read_access = SEC_OPEN,
};

static void services_init(void)
{
 ble_uuid128_t base_uuid = {BLE_UUID_SERVICE_BASE};
 ble_uuid_t service_uuid;
 ret_code_t err_code; 

 service_uuid.uuid = BLE_ADV_UUID_SERVICE;

 err_code = sd_ble_uuid_vs_add(&base_uuid, &service_uuid.type);
 APP_ERROR_CHECK(err_code);

 err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &service_uuid, &m_service_handle);
 APP_ERROR_CHECK(err_code);

 characteristic_init();

 return;
}

static void characteristic_init(void)
{
 ble_uuid_t char_uuid;
 ret_code_t err_code;

 err_code = characteristic_add(m_service_handle, &char_device_name, &m_char_handles[0]);
 APP_ERROR_CHECK(err_code);

 err_code = characteristic_add(m_service_handle, &char_appearance, &m_char_handles[1]);
 APP_ERROR_CHECK(err_code);

 return;
} 
 Best regards.

Karl Ylvisaker · Accepted Answer

Hello, 
 sdi_kei said: The v17.0.0 documentation stated that 0x00 would result in a Bluetooth SIG UUID, so I set it to this value. 
 Oh, thank you for pointing that out. I have made an internal ticket to have this reviewed. It just dawned on me that you are trying to populate the Device name and Appearance GAP characteristics. My mistake, I must have glanced over this too quickly. Since these three are mandatory characteristics of the Generic Access Service they will always have to be present, and as such, the SoftDevice will initialize them when initializing the Generic Access service. The SoftDevice controls these mandatory characteristics, which is likely why the FORBIDDEN error is returned. They can only be accessed through SoftDevice API calls. In most of our examples you can see how these characteristics are populated with SoftDevice API calls as part of the gap_params_init function. You can populate the appearance and device name characteristics through the calls to sd_ble_gap_appearance_set and sd_ble_gap_device_name_set . Apologies for misunderstanding your intentions earlier. Please do not hesitate to ask if anything still should be unclear, or if you have any other issues or questions. Best regards, Karl

NRF_ERROR_FORBIDDEN occurs in sd_ble_gatts_characteristic_add.

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