Hosted WebSocket relay for ESP32. Flash the library, connect with an API token, and call your device from anywhere — GPIO, sensors, OTA, your own HTTP API.
Checking relay…
Create an account and copy your API token. Reserve a device slug like my-bin.
Call tunnelToken("nt_…") then tunnelSetup(SELFHOST, "host/my-bin").
Hit https://host/my-bin/api/data from any app. Optional visitor ?key= password.
Self-hosted walkthrough — no YouTube, no Mux. Account → token → firmware → first API call.
Copy a snippet, replace the token and slug, then flash or call the public URL.
Arduino ZIP library plus every example sketch. Unzip, then Sketch → Include Library → Add .ZIP Library.