Loopback3 calling remote method or API periodically - node.js

Question

Basically, my requirement is to keep looking for new files in the folder, read the contents of the file and call the loopback API.
To achieve that I am trying to do something like below:
I have a remote method in loopback which needs to be called periodically i.e. after every 2 minutes. I read about the asynchronous boot scripts in the official loopback documentation here:
https://loopback.io/doc/en/lb2/Defining-boot-scripts#synchronous-and-asynchronous-boot-scripts
So far I have been able to write the following code:
module.exports = function(app, callback) {
setInterval(function() {
console.log('Hello world');
callback();
}, 120000);
};
But this throws an error below.
error: uncaughtException: listen EADDRINUSE :::443
Also, is there a way to call remote methods from the bootscripts ? Does loopback support cron/schedular or polling like functionality. Do I need to write a separate nodejs application which will call the API periodically.
Thanks

Answer 1

Your error states that your address(port number) if the server is already in use.
error: uncaughtException: listen EADDRINUSE :::443
You can try to listen on some other port number
app.listen(3000, function() {
console.log('listening on 3000')
});
Kill process running on same port
First, you would want to know which process is using port 3000
sudo lsof -i :3000
this will list all PID listening on this port, once you have the PID you can terminate it with the following:
kill -9 {PID}
Check if your code is not calling multiple listen on the same port
Let me know if this isn't resolving your problem