Hello,
we are facing the following issue when using Android and trying to rebond with a previously bonded S110 peripheral: Bonding the Android device with the S110 based device the first time is working fine - no problems. Next, the user of the Android device decides to "Unpair" the S110 device in the Android Bluetooth settings menu. Note: on the S110 the bond is not deleted. If the Android user now tries to (re)bond with the S110 device again, it seems that the bond procedure is executed correctly, however a propper connection can not be established anymore (Andriod reports a timeout). Looking at the issue with the sniffer it seems like some sort of encryption problem. It very much looks like the problem descibed in this (unsolved) thread: irk saved but ...
Tested on Android 5 and 6. S110 verions is 7.1.0 with SDK 7.2. We are using "Just works" bonding and whitelisting.
The only way to resolve this issue seems to delete the bond also in the S110 device. However, in our case this is not very user friendly.
Sniffer screen shot showing the failed connection attempt:
Does anyone know what might be going wrong here?
A sniffer trace (wireshark) with the rebond following by a connection trial: sniffer_trace.pcapng