DFU and Bonding

RE: DFU and Bonding

Mohamed O.Abouzeid — Sun, 20 Mar 2016 21:17:42 GMT

it didn't work even the addresses are different

RE: DFU and Bonding

Anne — Mon, 22 Sep 2014 23:55:29 GMT

I think this might work for us, thanks ^^

RE: DFU and Bonding

Petter Myhre — Mon, 22 Sep 2014 10:53:16 GMT

As far as I know, the only problem is that user has to disconnect, scan and reconnect to a "new device", which you are already aware of. I'm not sure how you are handling this, but one way to hide this from the user may be to add the old address(or some other form of identifier) to the DFU advertising packet. Then the iOS app can search for that and automatically connect when you hit the "update app button" in your iOS app.

RE: DFU and Bonding

Anne — Mon, 22 Sep 2014 00:04:20 GMT

Hi Peter, thanks for your reply. The address solution looks like the best for our setup, we're already disconnecting and reconnecting during DFU so that's not a big deal. One thing though, in Ole's comment on the second post in this thread he says that this approach can cause problems. Can you comment on what those might be?

RE: DFU and Bonding

Petter Myhre — Tue, 16 Sep 2014 19:00:38 GMT

There are two solutions to this, that I'm aware of.

One way is to let both the bootloader and the application to have access to the bond information and use it on reconnection. Then you have two choices:

You can trigger a service change indication to make iOS do a new service discovery.
Or you can integrate the attribute table (GATT Table layout) of the application and bootloader into both application and bootloader, so they are equal.

The other way is to use one MAC address for application and a different MAC address for the bootloader. Because of two different addresses, iOS will see two different devices. This is a very simple solution, if you can live with doing a second connection when you need to do the DFU.

I wished we had an example for the first choice, but we don't atm.

Please vote on the QUESTION if you want us to make an example.