#814 fix heartbeat bug

lib/connectors/commands/heartbeat.js

@@ -11,15 +11,16 @@ var Command = function(opts) {
   opts = opts || {};
   this.heartbeat = null;
   this.timeout = null;
+  this.disconnectOnTimeout = opts.disconnectOnTimeout;
 
   if(opts.heartbeat) {
     this.heartbeat = opts.heartbeat * 1000; // heartbeat interval
     this.timeout = opts.timeout * 1000 || this.heartbeat * 2;      // max heartbeat message timeout
+    this.disconnectOnTimeout = true;
   }
 
   this.timeouts = {};
   this.clients = {};
-  this.disconnectOnTimeout = opts.disconnectOnTimeout;
 };
 
 module.exports = Command;