RE: ANCS characteristics changed

Paul Yip — Tue, 08 Jul 2014 09:23:24 GMT

Hi Krishna,

We implemented the service changed in our app. The first time we set the CCCD okay. After the handle changed, we set the CCCD for the new handle failed. The followings are the log for wireshark.

It looks like there is a security issue after service change. Do you think we could solve? Thanks.

Paul

RE: ANCS characteristics changed

Krishna Shingala — Mon, 07 Jul 2014 09:00:57 GMT

Hi Paul,

By specification, for a bonded device, it is not permitted to change the handles of GATT Server record without notifying the GATT Client (ANCS) using the service changed characteristics.

However, currently ANCS does not handle service changed notification nor configures this characteristic on the peer. Application must handle this itself.

Hope this helps!

Regards, Krishna