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All you need is something reliable that sends and receives data.
Game of Thrones/ASOIF used ravens.
You could use specially trained rats in underground tunnels.
Relays of lights or fires in hill tops is always an option, as is smoke signals.
Lasers or spotlights projected on clouds could work. Or the dark of the moon. If everyone just agreed to a patch of lunar dust and projected binary flashes there, encrypted to respond to others, a crazy flashing dot covered moon would be the equivalent or a public internet.
Or same concept with blimps.