diff --git a/lib/transport/mqtt/MQTTTransportServer.js b/lib/transport/mqtt/MQTTTransportServer.js
index 0f56a3c..7cc61b4 100644
--- a/lib/transport/mqtt/MQTTTransportServer.js
+++ b/lib/transport/mqtt/MQTTTransportServer.js
@@ -9,13 +9,13 @@ class MQTTTransportServer {
         await this.mqttClient.subscribe(this.inTopic);
         this.mqttClient.on('message', (topic, data) => { 
             console.log(`SERVER RECEIVES ${topic}`, data.toString());
-            callback(data.toString(), (data) => {
+            callback(data.toString(), (callbackData) => {
                 const outTopic = 
                     typeof this.outTopic === "function" 
                     ? this.outTopic({inTopic: topic})
                     : this.outTopic;
 
-                this._send(outTopic, data)
+                this._send(outTopic, callbackData)
             })
         });
     }
@@ -26,4 +26,4 @@ class MQTTTransportServer {
     }
 }
 
-module.exports = MQTTTransportServer;
\ No newline at end of file
+module.exports = MQTTTransportServer;