resubscribe when disconnected

lib/blockchainexplorer.js

@@ -62,7 +62,9 @@ function getAddressActivityInsight(url, addresses, cb) {
 };
 
 function initSocketInsight(url) {
-  var socket = io.connect(url, {});
+  var socket = io.connect(url, {
+    'reconnection': true,
+  });
   return socket;
 };
 

lib/blockchainmonitor.js

@@ -58,11 +58,11 @@ BlockchainMonitor.prototype._initExplorer = function(provider, network, url) {
   var connectionInfo = provider + ' (' + network + ') @ ' + url;
   socket.on('connect', function() {
     log.info('Connected to ' + connectionInfo);
+    socket.emit('subscribe', 'inv');
   });
   socket.on('connect_error', function() {
     log.error('Error connecting to ' + connectionInfo);
   });
-  socket.emit('subscribe', 'inv');
   socket.on('tx', _.bind(self._handleIncommingTx, self));
 
   return explorer;