Automatically connect with SDK14.2 for HID

[Taylor]

Hi,

   In our application, we are using HID to control mobile phone or PC.When users connected our product, it will automatically connect next time.

But our product is battery powered,so we want to prohibit automatic connection when the battery is low(3.6V Li-battery).

How should I do when battery is low?

The version of SDK is SDK14.2.

[Taylor]

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);
    }
}

[Hung Bui]

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.

[awneil]

Taylor said:

the device will still to connect automatically

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.

[Taylor]

awneil said:

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

It's right!

Should I close advertising immediately after using sd_ble_gap_disconnect()?

What can be done with the code?

[Hung Bui]

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())