Shelly script to revert to direct switch control if Home Assistant is not available

shelly_with_ha.js

// Preconditions:
// Shelly connected to a manual switch and to a smart light
// Shelly set to disconnected mode and to restore power to on after power loss
// Input mode is button (might need a minor change for switch - untested)
// Shelly is added to Home Assistant
// An automation is created in Home Assistant to toggle the light when single button press is 
// detected on the Shelly (other automations may also exist)

let online_status = 0;
// Change this to the URL of your Home Assistant base URL + "/api/ping"
let ha_url = "http://home-ha:8123/api/ping";
// This returns a 404 error if the HA is available and timeout or connection error if it is not there

// Process response from the HA URL, the 404 error would be part of the result variable
function processHttpResponse(result, error_code, error) {
  if (error_code !== 0) {
     online_status = 0
     print("Offline")
  } else {
     online_status = 1
     print("Online")
  }
}

// Initiate the online check. This will return immediately - before the check completes
function do_online_check(){
   Shelly.call("HTTP.GET", {url: ha_url, timeout: 1}, processHttpResponse);
}   

// Whenever input button is pushed - if we are online, then do nothing (Home Assistant will handle
// the light switching), else do the switching directly by cutting power
// Also checks if we are online, but for latency reasons this will not affect the current event, but it
// will be ready for the follow-up events, so if HA goes down and we try to use the switch manually within 
// first 5 minutes of the outage, we would need to press the switch again about 1 second later.
Shelly.addEventHandler(function(e) {
   if (e.component === "input:0") {
     if (e.info.event === "single_push") {
       print("Button was pushed");
       do_online_check();
       if ( online_status === 0 ) {
          Shelly.call("Switch.toggle", {'id': 0});
       }
     }
   }
 });
 
// Check if we are online every 5 minutes
let atimer = Timer.set(1000*5*60, true, do_online_check);
do_online_check();

Thanks a lot for that helpful script, exactly what I was looking for!
I use it with input mode "switch", therefore i just removed lines 37, 38 and 43 from your script. works as it should.

Shelly.addEventHandler(function(e) {
   if (e.component === "input:0") {
       do_online_check();
       if ( online_status === 0 ) {
          Shelly.call("Switch.toggle", {'id': 0});
       }
   }