Whats nr 2 about? If you need with nr3, don't hesitate to ask in our channels/discord etc. there are many people who can help.

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I tried doing number 3 about two weeks ago with the intention of enabling TollGates to resell each other's Internet gateways. The router's resources are much too limited for CDK or cashu-cli though. Now I'm using an endpoint that melts cashu tokens to LNURL. Eventually the router's need a way to issue payments as well though...
Number 2 is about building a mesh network. Thats the end goal. Captive portals are just a useful milestone...