How I Coordinate Scripts Across Devices Without Open Ports, Firebase, or a VPS

My scrapers run on PythonAnywhere. My phone runs Termux. I wanted them to talk to each other. The standard options all had the same problem: they required infrastructure I didn't want to maintain. Firebase — cloud lock-in, SDK overhead, costs money at scale Ngrok — exposes a port on my phone, dies when the tunnel resets A VPS with Redis — another server to maintain, SSH into, keep alive Webhook to phone — my phone is behind NAT, no open ports The fundamental issue: cloud scripts push, but phones