Automatically connect with SDK14.2 for HID

RE: Automatically connect with SDK14.2 for HID

Ben_nrf52840 — Thu, 16 Sep 2021 09:05:21 GMT

Hi,

Please don't mind it..

I've found the host doesn't connect automatically after I set ble_adv_on_disconnect_disabled to true.

Regards,

Ben

RE: Automatically connect with SDK14.2 for HID

Ben_nrf52840 — Thu, 16 Sep 2021 08:28:04 GMT

Hi,

I have the same issue which is connected automatically from the host in HID.

I disconnect by using sd_ble_gap_disconnected() and stop advertising using sd_ble_gap_adv_stop().

I confirmed the advertise is not started automatically in the BLE_GAP_EVT_DISCONNECTED.

I'm using nrf52840 with SD version 17.0.2.

Would you please help to prevent host from connecting automatically?

Regards,

Ben

RE: Automatically connect with SDK14.2 for HID

Hung Bui — Wed, 09 Jun 2021 09:56:51 GMT

If you don't do advertising when you are in a connection, you just don't re-start advertising (check in the code if you do re-start advertising after BLE_GAP_EVT_DISCONNECTED event).

If you already advertise when you are in a connection, you would need to stop that. You can stop it after using sd_ble_gap_disconnect())

RE: Automatically connect with SDK14.2 for HID

Taylor — Wed, 09 Jun 2021 09:21:13 GMT

[quote userid="6462" url="~/f/nordic-q-a/76007/automatically-connect-with-sdk14-2-for-hid/313927#313927"]It's not the device - it's the Central which does that.[/quote]

It's right!

Should I close advertising immediately after using sd_ble_gap_disconnect()?

What can be done with the code?

RE: Automatically connect with SDK14.2 for HID

awneil — Mon, 07 Jun 2021 12:49:19 GMT

[quote userid="97810" url="~/f/nordic-q-a/76007/automatically-connect-with-sdk14-2-for-hid/313876#313876"]the device will still to connect automatically[/quote]

It's not the device - it's the Central which does that.

And that would be the normal behaviour that users would expect - if your mouse disconnects for some reason, you'd want it to automatically re-connect as soon as possible.

As Hung Bui said, if you don't want the Central to connect, then don't advertise.

RE: Automatically connect with SDK14.2 for HID

Hung Bui — Mon, 07 Jun 2021 12:32:48 GMT

What do you meant by "still to connect automatically" ? Would the connection terminated ?
If the connection terminate, you can just don't restart advertising then the central won't be able to connect to your device.

RE: Automatically connect with SDK14.2 for HID

Taylor — Mon, 07 Jun 2021 10:06:53 GMT

I had used sd_ble_gap_disconnect(),but the device will still to connect automatically.

void ble_disconnect()
{
    uint32_t err_code;

    if (BLE_STATUS_CONNECTED == sg_ble_interface_m.status)
    {
        sg_ble_interface_m.status = BLE_STATUS_W_DISCONN;
        err_code = sd_ble_gap_disconnect(sg_ble_interface_m.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
        APP_ERROR_CHECK(err_code);
    }
}

RE: Automatically connect with SDK14.2 for HID

Hung Bui — Mon, 07 Jun 2021 10:01:31 GMT

Could you please explain this ?

[quote user="ColorPen"]If the device had connected,I can not disconnect manually,because it had be bonded.[/quote]

If you want to disconnect, on the peripheral side, you can just call sd_ble_gap_disconnect() to terminate the connection.

If you have battery service you can notify the central about the current battery level of the device.

RE: Automatically connect with SDK14.2 for HID

Taylor — Mon, 07 Jun 2021 09:42:25 GMT

Thanks for your reply.

I had set a mode which would not advertising when the battery is low.If the device had connected,I can not disconnect manually,because it had be bonded.

How does the Phone/PC know the condition of the device? We don't have custom service.

RE: Automatically connect with SDK14.2 for HID

awneil — Fri, 04 Jun 2021 11:44:45 GMT

I guess you could make the advertising non-connectable?

Does the product already indicate battery level in the advertising?

[quote userid="2121" url="~/f/nordic-q-a/76007/automatically-connect-with-sdk14-2-for-hid/313632#313632"]This way you can tell the phone/PC about the condition of the device[/quote]

Presumably, that would require a custom app on the phone/PC ?

RE: Automatically connect with SDK14.2 for HID

Hung Bui — Fri, 04 Jun 2021 11:35:11 GMT

Hi Taylor,

You can do what Andrew suggested, to not advertise.
If you still want the phone/PC to be able to connect but not auto-connect you can think of advertising with different BLE address. This way you can tell the phone/PC about the condition of the device. You can choose to do very long interval advertising when the battery is low.

RE: Automatically connect with SDK14.2 for HID

awneil — Fri, 04 Jun 2021 10:08:18 GMT

[quote userid="97810" url="~/f/nordic-q-a/76007/automatically-connect-with-sdk14-2-for-hid"]we want to prohibit automatic connection when the battery is low[/quote]

So just don't advertise in that condition?

You would also need some way for the user to know that it's just low battery - rather than any other problem ...