Shelly Script

ha_watchdog.js

let switchId = 1;
let checkPeriod = 60 * 1000; // in ms
let haUrl = 'http://192.168.50.10:8123';
let mode = "detached"; // Could be "detached", "flip", "follow" or "momentary". Use "detached" when HA is in control
          
function updateConfig(oldConfig) {
  //Apply the new config only if the switch is not already working in the desired mode  
  if (oldConfig.in_mode !== mode) {
    print("switching it up");
    Shelly.call("Switch.SetConfig", { id: switchId, config: { in_mode: mode } });
    if (mode === "detached") {
      print("set switch on and hooks off");
      Shelly.call("Switch.Set", { id: switchId, on: true });
    }
  } else {
    print("no change");
  }
}

function setSwitchFromResponse(response) {
  print("response");
  // If HA is accessible the response code is 200 update the current mode and the new configuration
  if (response === undefined) {
    mode = "flip";
    print("default flip");
  } else {
    if (response.code === 200) {
      mode = "detached";
      print("detached");
    } else {
      mode = "flip";
      print("flip");
    }
  }
  // Get the current output configuration and pass it to updateConfig
  print("update config");
  Shelly.call("Switch.GetConfig", {id: switchId}, updateConfig);
  print("update config done")
}

function testHA() {
  // For RPC command HTTP.GET, both url and body are required. 
  print("test ha server");
  Shelly.call("HTTP.GET", {url: haUrl, body:{}}, setSwitchFromResponse);
}

print("Starting HA Monitor");
// Timer.set(period_in_ms, reapeate_indefinitely, function)
Timer.set(checkPeriod, true, testHA);

This is originally not my code. I found it somewhere long ago. Sorry i can't find where, but know i'm not responsible for v1 codebase. All that credit goes to original coder, whomever they were.