ESP8266 D1 mini
Control the onboard LED by CID or a physical button.
Use Remocon esp8266-d1-mini, the ESP8266 board core, and Bounce2. The onboard LED is GPIO2 (D4), active LOW; connect the button between GPIO14 (D5) and ground.
Set Wi-Fi credentials and io.remocon.kr:55488. Connect the workbench to the corresponding WebSocket server, discover and apply the CID, then send on, off, or toggle to deviceCID@. Read deviceCID@$state to observe the applied state.
The physical button directly toggles the local LED and publishes state. It is different from the C3 example, whose button sends a shared channel event. See CID control for discovery and subscription steps.