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sd_ble_gatts_hvx and NRF_ERROR_SVC_HANDLER_MISSING

Hello.

   I try to periodically updated data in my characteristic that way:

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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;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

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:

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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;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Best regards

PW