Cannot disconnect the device once it is connected

[soma]

Hello guys,

I have problem, I activate the BLE and connect it to my tablet application until then nothing wrong happens. But when I use sd_ble_gap_disconnect() to disconnect, I got error_code 0x3002 which prevent me to disconnect.

what I do to disconnect:

check = softdevice_handler_isEnabled();
if (check == true && m_conn_handle != BLE_CONN_HANDLE_INVALID)
{
	u32_err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
	m_conn_handle = BLE_CONN_HANDLE_INVALID;
    APP_ERROR_CHECK(u32_err_code); //err_code returned before check 0x3002
}
u32_err_code = sd_ble_gap_adv_stop();
APP_ERROR_CHECK(u32_err_code);  //err_code returned before check 0x0008

I use nrf52832, s132 softdevice with uart. I want to be disconnected and stop advertising, can any one please let me know how to correct this.

Thanks in advance for your time!

PS: The device is a peripheral one

[Joakim Jakobsen]

Hi Soma!

Are you sure that you are in a connection and that the connection handle has been updated before initiating the disconnect?
The error 0x3002 indicates that a invalid connection handle has been supplied.
I tested this in the ble_app_uart example in SDK 11, and it seems to work fine.
I executed the disconnection on a button push;

bool check; 
uint32_t err_code;
	case BSP_EVENT_KEY_2: 
	   check = softdevice_handler_isEnabled();
	   if ((check == true) && (m_conn_handle != BLE_CONN_HANDLE_INVALID))
	   {
	      err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
	      APP_ERROR_CHECK(err_code);
	   }
	   break; 

The sd_ble_gap_disconnect() call initiates the disconnection procedure, and its completion will be communicated to the application with a BLE_GAP_EVT_DISCONNECTED event. Your connection handle will most likely be set to invalid when the disconnection event is received.
Take a look at this message sequence chart.

When the disconnection event i received, the device will most likely start advertising again.
You can see how this is handled in the ble_advertising.c file.
The fact that the sd_ble_gap_adv_stop() returns error code 0x0008 (NRF_ERROR_INVALID_STATE) is most probably because your device is not in advertising state yet.

Best regards,
Joakim.

[soma]

yeah i'm sure that the device is connected. I even tried with the nrf toolbox and nrf connect application.

[Joakim Jakobsen]

Which SDK example are you working with?
When do you make the call to the sd_ble_gap_disconnect()? Is it on a specific event that you want to disconnect?

[soma]

I'm working with the SDK 11. I'm launching the disconnecting related code when I receive the event of a press button.

[Joakim Jakobsen]

Hard to say why it won't disconnect. Maybe you could upload your project so I can test it here?
Best regards.