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It's interesting, but not sure if will be so practical. I see many force closed channels from this if is used with public channels.
For a private LN with some private channels between participants (as I explained in this post #843264) maybe it will work and could have its usage.
[Vendor OFFLINE] --Bluetooth--> [Customer OFFLINE] --Bluetooth--> [Gateway ONLINE] --> Lightning Network
Much better is to use that mesh network for all to reach that internet gateway... like this one https://ncmesh.net