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.

[awneil]

Taylor said:

we want to prohibit automatic connection when the battery is low

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 ...

[Hung Bui]

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.

[awneil]

I guess you could make the advertising non-connectable?

Does the product already indicate battery level in the advertising?

Hung Bui said:

This way you can tell the phone/PC about the condition of the device

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

[Taylor]

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.

[Hung Bui]

 Could you please explain this ? 

Taylor said:

If the device had connected,I can not disconnect manually,because it had be bonded.

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.