An error has occurred due to a connection timeout with the net.Socket

I have been attempting to send text to my network printer using a tcp connection.

   function print(buf2){
   var printer = new net.Socket();

   printer.connect(printer_port, printer_name, function() {
     console.log('Connected');
     printer.write(buf2);
     printer.end()
   });
   }

Initially, everything works perfectly. However, after some time, I encounter an error Uncaught Error: connect ETIMEDOUT which prevents the connection with my printer.

To temporarily resolve this issue, I navigate to my printer's IP address (192.168.1.111) in a browser, and the application reconnects successfully. Nevertheless, the problem reoccurs after some time resulting in the same error (Uncaught Error: connect ETIMEDOUT).

My application is built with electron and utilizes the net npm package.

   var net = require('net');

Within my application, every 3 seconds I trigger a get request followed by calling the print method.

  function proxy() {
  var client = new HttpClient();
  client.get('my_link', function(response) {
    var jsonItem = JSON.parse(response)
    if(jsonItem.items.length > 0) 
    {
      var text_to_print = jsonItem.items[0].text
      print(text_to_print,text_id);
    }

Any insights into what might be causing this error?

Answer №1

If you're having issues debugging, this code snippet might help.

function print(printer_port, printer_name, buf2) {
    var printer = net.createConnection(printer_port, printer_name, function () {
        //'connect' listener
        console.log("Connected!");
        printer.end(buf2);
    });

    printer.setTimeout(60 * 1000); //Set timeout to 1 minute

    printer.on("end", function () {
        console.log("Disconnected from server!");
    });

    printer.on("timeout", function () {
        console.log("Timeout!");
        printer.destroy();
    });
}

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