Hello.
I try to periodically updated data in my characteristic that way:
uint32_t ble_first_service_send(uint16_t my_conn_handle, ble_my_service_t * p_my_service, ble_my_service_meas_t * p_my_service_meas) { uint8_t err_code; if(m_conn_handle != BLE_CONN_HANDLE_INVALID) { uint8_t encoded_sensor[MAX_SENSOR_LEN]; uint16_t len; ble_gatts_hvx_params_t hvx_params; NRF_LOG_INFO("CONNECTION OK"); len = my_service_measurement_encode(p_my_service, p_my_service_meas, encoded_sensor); memset(&hvx_params, 0, sizeof(hvx_params)); hvx_params.handle = p_my_service->first_char_handles.value_handle; hvx_params.type = BLE_GATT_HVX_NOTIFICATION; hvx_params.p_len = &len; hvx_params.p_data = encoded_sensor; err_code = sd_ble_gatts_hvx(m_conn_handle, &hvx_params); } else { err_code = NRF_ERROR_INVALID_STATE; } return err_code; }
As soon as I connected via "nRF Connect", function "sd_ble_gatts_hvx" returns: NRF_ERROR_SVC_HANDLER_MISSING.
The window looks like:
If I open the window:
functions "sd_ble_gatts_hvx" returns NRF_ERROR_INVALID_STATE, which without enabled notification is correct value. Does anyone know, what happen in app when I open this window?
Why functions returns NRF_ERROR_SVC_HANDLER_MISSING ?
Characteristic add function:
static uint32_t my_first_char_add(ble_my_service_t * p_my_service, const ble_my_service_init_t * p_my_service_init) { ble_gatts_char_md_t char_md; ble_gatts_attr_md_t cccd_md; ble_gatts_attr_t attr_char_value; ble_gatts_attr_md_t attr_md; ble_uuid_t ble_uuid; ble_my_service_meas_t initial_bpm; uint8_t encoded_sensor[MAX_SENSOR_LEN]; memset(&cccd_md, 0, sizeof(cccd_md)); BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm); BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm); cccd_md.vloc = BLE_GATTS_VLOC_STACK; memset(&char_md, 0, sizeof(char_md)); char_md.char_props.read = 1; char_md.char_props.notify = 1; char_md.p_char_user_desc = NULL; char_md.p_char_pf = NULL; char_md.p_user_desc_md = NULL; char_md.p_cccd_md = &cccd_md; char_md.p_sccd_md = NULL; ble_uuid.type = p_my_service->uuid_type; ble_uuid.uuid = BLE_UUID_MY_SERVICE_CHAR_1; memset(&attr_md, 0, sizeof(attr_md)); BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm); BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&attr_md.write_perm); attr_md.vloc = BLE_GATTS_VLOC_STACK; attr_md.rd_auth = 0; attr_md.wr_auth = 0; attr_md.vlen = 0; memset(&attr_char_value, 0, sizeof(attr_char_value)); attr_char_value.p_uuid = &ble_uuid; attr_char_value.p_attr_md = &attr_md; attr_char_value.init_len = my_service_measurement_encode(p_my_service, &initial_bpm, encoded_sensor); attr_char_value.init_offs = 0; attr_char_value.max_len = MAX_SENSOR_LEN; attr_char_value.p_value = fake_data0; return sd_ble_gatts_characteristic_add(p_my_service->service_handle, &char_md, &attr_char_value, &p_my_service->first_char_handles); }
Best regards
PW