Hi,
I adapted the nus_client from the Nordic Connect SDK v2.7.0. I changed the UUID and some function names, but in general the code stays the same. I can subscribe one of the characteristics and receive data from it. But the problem is, that everytime I receive a notification, I get another receive event with an empty data array. This leads to an unsubscribtion of the characteristic.
00> D: [NOTIFICATION] data 0x2000d40c length 4 00> D: ble_mode_data_received 00> data: 01000000 00> D: [NOTIFICATION] data 0 length 0 00> D: [UNSUBSCRIBED]
The client only sends notifications with length = 1, so it's unlikely that the event comes from the client. The client is implemented in nrf5 SDK and sends data with the following code:
void ble_fob_on_mode_change(uint16_t conn_handle, ble_fob_t * p_fob, uint8_t mode_state)
{
ble_gatts_value_t gatts_value;
// Initialize value struct.
memset(&gatts_value, 0, sizeof(gatts_value));
gatts_value.len = sizeof(uint8_t);
gatts_value.offset = 0;
gatts_value.p_value = &mode_state;
sd_ble_gatts_value_set(conn_handle,
p_fob->mode_char_handles.value_handle,
&gatts_value);
// send notification
if(conn_handle != BLE_CONN_HANDLE_INVALID)
{
ble_gatts_hvx_params_t params;
uint16_t len = sizeof(mode_state);
memset(¶ms, 0, sizeof(params));
params.type = BLE_GATT_HVX_NOTIFICATION;
params.handle = p_fob->mode_char_handles.value_handle;
params.p_data = &mode_state;
params.p_len = &len;
sd_ble_gatts_hvx(conn_handle, ¶ms);
}
}
How can I resolve this problem?
Best regards,
Christian
