code: function(callback) {
    // Define nodes to bootstrap from
    var nodes = [
      { maintainer: 'Impyy',
        address: '178.62.250.138',
        port: 33445,
        key: '788236D34978D1D5BD822F0A5BEBD2C53C64CC31CD3149350EE27D4D9A2F9B6B' },
      { maintainer: 'sonOfRa',
        address: '144.76.60.215',
        port: 33445,
        key: '04119E835DF3E78BACF0F84235B300546AF8B936F035185E2A8E9E0A67C8924F' }
    ];
  
    async.mapAsync(nodes, function(node, cb) {
      tox.bootstrapFromAddressAsync(node.address, node.port, node.key).then(function() {
        console.log('Successfully bootstrapped from ' + node.maintainer + ' at ' + node.address + ':' + node.port);
        console.log('... with key ' + node.key);
        cb();
      }).catch(function(err) {
        console.error('Error bootstrapping from ' + node.maintainer + ':', err);
        cb(err);
      });
    }).then(function() {
      // Once all nodes have been bootstrapped from, call our callback
      callback();
    });
  }
docs: Bootstrap tox via hardcoded nodes.
  For more nodes, see: https://wiki.tox.chat/users/nodes