Hello.
I connected the Image transfer service (running on a nrf52840) to another nrf52840 running a modified BLE_NUS_C service.
However, a BLE packet won't be send out, because the function ble_its_img_info_send(&m_its, &image_info) (lined below) will be aborted because of the check:
if ((!p_its->is_info_char_notification_enabled))
{
printf("Failed with NRF_ERROR_INVALID_STATE, because \"is_info_char_notification_enabled\"==false\n");
return NRF_ERROR_INVALID_STATE;
}
uint32_t ble_its_img_info_send(ble_its_t * p_its, ble_its_img_info_t * img_info)
{
uint8_t data_buf[1 + sizeof(ble_its_img_info_t)];
ble_gatts_hvx_params_t hvx_params;
VERIFY_PARAM_NOT_NULL(p_its);
if ((p_its->conn_handle == BLE_CONN_HANDLE_INVALID))
{
printf("Failed: BLE_CONN_HANDLE_INVALIDn");
return NRF_ERROR_INVALID_STATE;
}
if ((!p_its->is_info_char_notification_enabled))
{
printf("Failed with NRF_ERROR_INVALID_STATE, because \"is_info_char_notification_enabled\"==false\n");
return NRF_ERROR_INVALID_STATE;
}
uint16_t length = 1 + sizeof(ble_its_img_info_t);
data_buf[0] = 1;
memcpy(&data_buf[1], img_info, sizeof(ble_its_img_info_t));
memset(&hvx_params, 0, sizeof(hvx_params));
hvx_params.handle = p_its->img_info_handles.value_handle;
hvx_params.p_data = data_buf;
hvx_params.p_len = &length;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
return sd_ble_gatts_hvx(p_its->conn_handle, &hvx_params);
}
When searching for the is_info_char_notification_enabled variable/flag, it is controlled in the on_write() function triggered by the BLE_GATTS_EVT_WRITE event.
/**@brief Function for handling the @ref BLE_GATTS_EVT_WRITE event from the S110 SoftDevice.
*
* @param[in] p_its Nordic UART Service structure.
* @param[in] p_ble_evt Pointer to the event received from BLE stack.
*/
static void on_write(ble_its_t * p_its, ble_evt_t const * p_ble_evt)
{
ble_gatts_evt_write_t const * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;
if (
(p_evt_write->handle == p_its->tx_handles.cccd_handle)
&&
(p_evt_write->len == 2)
)
{
if (ble_srv_is_notification_enabled(p_evt_write->data))
{
p_its->is_notification_enabled = true;
}
else
{
p_its->is_notification_enabled = false;
}
}
else if (
(p_evt_write->handle == p_its->img_info_handles.cccd_handle)
&&
(p_evt_write->len == 2)
)
{
if (ble_srv_is_notification_enabled(p_evt_write->data))
{
printf("CHAR NOTIFICATION ENABLED\n");
p_its->is_info_char_notification_enabled = true; //HERE
}
else
{
printf("CHAR NOTIFICATION DISABLED\n");
p_its->is_info_char_notification_enabled = false;
}
}
else if (
(p_evt_write->handle == p_its->rx_handles.value_handle)
&&
(p_its->data_handler != NULL)
)
{
p_its->data_handler(p_its, p_evt_write->data, p_evt_write->len);
}
else
{
// Do Nothing. This event is not relevant for this service.
}
}
What does this variable/flag mean?
What is missing that it won't be set when connecting to my BLE_NUS_C service, however, it is working when connecting to the Image_Transfer_Demo Andoid APP?
How can I solve that?
Thnaks!
