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Timeout while adding a contact
Several users reported timeouts while adding contacts. The problem seemed to be more severe in larger groups. One user experienced a long series of timeouts before successfully adding a contact.
If this problem is caused in some cases by congestion at the Bluetooth MAC layer, we may be able to mitigate it by keeping a cache of discovered devices and trying to connect to them before performing discovery. If a group of users are adding each other as contacts, the first discovery by each user should put most of the other users' devices in the cache.
If this problem is caused in some cases by poorly performing Bluetooth drivers or hardware, we may not be able to work around it at the application level.
This could be caused by the limit of eight devices (one master and seven slaves) in a Bluetooth piconet. If so, closing any open Bluetooth connections before attempting a new connection may help.