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Send pong packets after establishment

After connection was established, transports should send pong packets every 5 minutes to avoid connection timeout (10 minutes) if remote node is idle.

tcp connection not established

When I'm running the networking example code below it does not establishing a connection.

var messages = require("bitmessage").messages;
var TcpTransport = require("bitmessage-transports").TcpTransport;

var tcp = new TcpTransport({
  dnsSeeds: [["bootstrap8444.bitmessage.org", 8444]],
});

tcp.bootstrap().then(function(nodes) {
  var remoteHost = nodes[0][0];
  var remotePort = nodes[0][1];
  console.log("Connecting to", nodes[0]);
  tcp.connect(remotePort, remoteHost);
});

tcp.on("established", function(version) {
  console.log("Connection established to", version.userAgent);

  tcp.on("message", function(command, payload) {
    console.log("Got new", command, "message");
    var decoded;
    if (command === "addr") {
      decoded = messages.addr.decodePayload(payload);
      console.log("Got", decoded.addrs.length, "node addresses");
    }
  });
});

An initial syn package is sent followed by 6 re-transmissions and than it just sits until it crashes with the output below.

node test_code.js 
Connecting to [ '118.169.41.196', 8444 ]
events.js:85
      throw er; // Unhandled 'error' event
            ^
Error: connect ETIMEDOUT
    at exports._errnoException (util.js:746:11)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1010:19)

Everything is fine if I'm running the tests for the library, no problem with establishing a tcp connection with localhost. Do you have any idea of why it's not working?

Many thanks.