[SOLVED] Connect to MQTT problems

Hi,

I'm trying to use MQTT on a ESP8266 (Flash map 1MB:512/512, manuf 0xc8 chip 0x4014) and always returns same error:

1526108440: New connection from 192.168.10.44 on port 1883.
1526108440: New client connected from 192.168.10.44 as 4e8422275dd0 (c1, k60).
1526108440: Socket error on client 4e8422275dd0, disconnecting.

It's only a simple connection test code like this:

var wifi = require("Wifi");
var mqtt = require("MQTT").create("192.168.10.43", {
  keep_alive: 60,
  clean_session: true
});

wifi.connect("MyWifi", {password: "MyPassword"},function(err){
  if (!err) {
    const info = wifi.getIP();
    console.log('connected? err=', err, 'info=', info);
    mqtt.connect();
  } else {
    console.log('error: ',err);
  }
});
wifi.stopAP();

mqtt.on("connected", function(){
  console.log("connected");
});

mqtt.on("disconnected", function(){
  console.log("disconnected");
});

The output is always the same:

>
 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 1v97 (c) 2018 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 1MB:512/512, manuf 0xc8 chip 0x4014
>connected? err= null info= {
  "ip": "192.168.10.44",
  "netmask": "255.255.255.0",
  "gw": "192.168.10.1",
  "mac": "5c:cf:7f:f1:bd:25"
 }
connected
>
=undefined
disconnected
disconnected
> 

I try a lot of configurations and I don't know how to continue:

1. Mosquitto server's: 1.4.14, 1.4.15, "test.mosquitto.org",...etc
   
2. Test on different ESP8266 boards.
   
3. Using module "MQTT" and "TinyMQTT".
   
4. Move "mqtt.connect()" line inside "wifi.connect" callback
   

5. Try using connect directly:

   var mqtt = require("MQTT").connect({
   host: "192.168.10.43",
   });
   

6. Run mosquitto server in verbose mode "mosquitto -v":

   1526109123: New connection from 192.168.10.44 on port 1883.
   1526109123: New client connected from 192.168.10.44 as 3fefc4344328 (c1, k60).
   1526109123: Sending CONNACK to 3fefc4344328 (0, 0)
   1526109123: Socket error on client 3fefc4344328, disconnecting.
   

Mosquitto server is up and runnig with anonymous access acepted. I'm using this server with other esp8266 boards running native C code and goes good, so I think that is no problem with the server.

If someone can help me with this problem, I would be enormously grateful.

Thank you