Push scanned badges based on X-Total-Count value mismatch

[stephanj]

We've experience at Devoxx France that some individual scans are not synced with the server because of no internet connection. This is why the user should have a "Sync All" button, where all scans are pushed to the server in a first phase.

What would be better is that the app automatically checks if the total scans corresponds with the total scans on the server using the HTTP field 'X-Total-Count'. If the X-Total-Count does not correspond with the total scans locally then a sync-all is triggered.