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Very nice.

On iOS can this listen on IPv6? Some cell providers allow incoming connections on IPv6.

This coupled with a dynamic DNS service could make for a cheap, always-on and portable server. Maybe put Cloudflare in front of it for IPv4 access and use their cache to smooth out TTL expiration between IP changes.

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You can't keep an iOS app always listening though.

It’d be interesting to create a proxy service of some sort that woke up the app using push notifications before forwarding the actual connection.

Would the OS keep it loaded if it also played sound?

Probably, but it wouldn't pass App Store review.

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