Emit 'disconnect' on client disconnections.

Author: mvimercati

lib/mqtt.js

@@ -48,8 +48,14 @@ Cayenne.prototype.connect = function(callback) {
       return callback(null, self.client);
   });
 
+  this.client.on('close', function () {
+      self.emit("disconnect");
+  });
+    
   this.client.on('message', self.onMessage.bind(self));
 
+
+    
   const cmdTopic = apiVersion + '/:username/'+THINGS+'/:thingId/cmd/:channel';
   Router.addRoute(cmdTopic, this.handleCommand.bind(this));