Communication between Raspberry Pis on different networks (sh.itjust.works)

submitted 10 months ago by illectrility@sh.itjust.works to c/python@programming.dev

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I'm sorry if this isn't the place to ask this, I also asked over at !raspberrypi@lemmy.ml.

So what I want to do is this: Two RasPis are at different locations. They're on different networks but have internet access. Pressing a button on one of the Pis turns on an LED over at the other Pi via GPIO. How can I make the communication work? My first thought was Telegram bots as I'm familiar with those for notifications but you can't have Telegram bots communicate with each other, sadly. Is there a good (and secure) solution to this? Preferably using Python code and without continuous costs like server hosting, etc?

Thanks!

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[-] knfrmity@lemmygrad.ml 2 points 10 months ago

VPN server on one, client on another.

A matrix bot on each end would work too but seems unnecessarily complicated.

[-] norambna@programming.dev 1 points 10 months ago

A VPN would be my first choice. ZeroTier works like a charm on the RPis. I've shared even SQLite databases over Samba over Zerotier among a bunch of RPis daily for a couple of years without a hitch.