unsubscribe should not remove other topic's listeners

src/core/Topic.js

@@ -40,6 +40,11 @@ ROSLIB.Topic = function(options) {
     this.emit('warning', this.throttle_rate + ' is not allowed. Set to 0');
     this.throttle_rate = 0;
   }
+
+  var that = this;
+  this._messageCallback = function(data) {
+    that.emit('message', new ROSLIB.Message(data));
+  };
 };
 ROSLIB.Topic.prototype.__proto__ = EventEmitter2.prototype;
 
@@ -51,14 +56,10 @@ ROSLIB.Topic.prototype.__proto__ = EventEmitter2.prototype;
  *   * message - the published message
  */
 ROSLIB.Topic.prototype.subscribe = function(callback) {
-  var that = this;
   this.on('message', callback);
-  this.ros.on(this.name, function(data) {
-    var message = new ROSLIB.Message(data);
-    that.emit('message', message);
-  });
 
   if (!this.subscribeId) { return; }
+  this.ros.on(this.name, this._messageCallback);
   this.subscribeId = 'subscribe:' + this.name + ':' + (++this.ros.idCounter);
   this.ros.callOnConnection({
     op: 'subscribe',
@@ -76,7 +77,7 @@ ROSLIB.Topic.prototype.subscribe = function(callback) {
  */
 ROSLIB.Topic.prototype.unsubscribe = function() {
   if (!this.subscribeId) { return; }
-  this.ros.removeAllListeners([this.name]);
+  this.ros.off(this.name, this._messageCallback);
   this.ros.callOnConnection({
     op: 'unsubscribe',
     id: this.subscribeId,