Espruino Wifi Socket recovery

Thanks @allObjects. I have rewritten the socket code many times to try and make this work but the result is always similar. I have refactored things now to be more inline with the guide (although the API reference shows a similar pattern to the one above). Here is the exact code of my running application

function connectNmea() {
  var client = require("net").connect(NMEA_OPTIONS, function(socket, err) {
    if (err) {
      console.log("Connection error: "+err);
      setTimeout(connectNmea, 5000);
      return;
    }
    client.on('end', function() {
      console.log("Nmea socket closed");
      EventBus.clear('gpsData');
      setTimeout(connectNmea, 5000);
    });
    EventBus.subscribe('gpsData', function(data) {
      client.write(data);
    });
  });
}

The EventBus is a simple implementation that queues messages in a simple pub / sub pattern. The EventBus.subscribe('gpsData',... code is simply pulling data out of a queue from the Serial Port. The server is a separate application that I cannot alter but I have stress tested it and it will handle hundreds of concurrent connections without difficulty.

Debugging the state of the client when the 'end' event is called it looks like

=Socket: { "type": 0,
  "#onconnect": function (socket,err) { ... },
  "opt": {
    "host": "192.168.1.12",
    "port": 10110 },
  "conn": false,
  "#onend": function (data) { ... },
  "dSnd": "",
  "cls": true, "endd": true }

and then 5 seconds later in the reconnection it appears to be properly initialized

=Socket: { "type": 0,
  "#onconnect": function (socket,err) { ... },
  "opt": {
    "host": "192.168.1.12",
    "port": 10110 },
  "sckt": 2, "conn": true }

but will immediately be closed again and won't sent data. Ignoring the 'end' and leaving the code still running will report (obviously!)"function called from system Uncaught Error: This socket is closed"

I agree that blind socket reconnects don't always make sense but the link is still up the server is still running and the code doesn't call for a disconnect. Happy to do any amount of debugging but very keen to make this work. Thanks