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I did not specify that one well. Indeed watchtowers are targeted for a different problem.
The fact that mobile wallet has to actively communicate with another node when receiving transaction is very much related to LN architecture and there could be either solutions on LN/application side or on the iOS power mgmt side...
Also wrong.
There is IMMORTAN library written for SBW wallet around which makes everything possible for LN light client to work efficiently on mobile including augmented graph with Public Hosted Channels and trampoline routing.
The first BLW wallet actually had even Bitcoin SPV.
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