MM2 launch without internet
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That is actually one of the use case i am covering with my app and BLE module:
https://forum.magicmirror.builders/topic/1497/magicmirrorapp/2
One of the features is, that you can connect a MagicMirror to a wifi network over bluetooth.
Only downside is, that there is currently only an app for Android and not for IOS or Windows Phone (i currently have neither, so can’t develop one in the near future).