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POSafely achieving three and four way device synchronisation without [[UIDevice] uniqueIdentifier]?
 

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    <p>Switching to custom generated device UUID's is turning out to truly be a nightmare! I am hoping someone has come across this before and might know a way to deal with it.</p> <p>Assume a user has an application with a data set of 500,000 (small) records, its not feasible to simply copy the entire db of a device and merge them. A user has this application installed on an:</p> <ol> <li>iPhone,</li> <li>MacBook</li> <li>Android tablet.</li> </ol> <p>When connected to the same physical network, each device can see each other and can initiate a synchronisation. To achieve three way data synchronisation (that does not depend on a central server or an internet connection).</p> <ol> <li>Each device keeps a list of timestamped changes.</li> <li>Each device knows the last time it synchronised with each of the other two devices.</li> <li>When a device sees another device, it sends through all known changes since the last time they spoke to that device.</li> <li>If a new device is discovered, no problem just send through all data ever entered.</li> </ol> <p>The problem comes along if a user backs up their iphone or ipad, and restores it onto another iphone or ipad. Under this scenario we are ending up with a user that has two devices on the local network with the same UUID. Updates end up (randomly) going to one or the other identically identified devices.</p> <p>I know we can continue to use the device unique identifier for now, but I am worried whats going to happen once its gone!</p>
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