Only track devices when we need to.

res/app/components/stf/socket/socket-service.js

@@ -2,5 +2,27 @@ var io = require('socket.io')
 
 module.exports = function SocketServiceFactory() {
   var socketService = io.connect()
+
+  socketService.scoped = function($scope) {
+    var listeners = []
+
+    $scope.$on('$destroy', function() {
+      listeners.forEach(function(listener) {
+        socket.removeListener(listener.event, listener.handler)
+      })
+    })
+
+    return {
+      on: function(event, handler) {
+        listeners.push({
+          event: event
+        , handler: handler
+        })
+        socketService.on(event, handler)
+        return this
+      }
+    }
+  }
+
   return socketService
 }