diff --git a/1-getting-started/lessons/4-connect-internet/code-commands/server/app.py b/1-getting-started/lessons/4-connect-internet/code-commands/server/app.py
index e6b46379..8c506d93 100644
--- a/1-getting-started/lessons/4-connect-internet/code-commands/server/app.py
+++ b/1-getting-started/lessons/4-connect-internet/code-commands/server/app.py
@@ -5,8 +5,9 @@ import paho.mqtt.client as mqtt
 
 id = '<ID>'
 
-client_telemetry_topic = id + '/telemetry'
-client_name = id + '_nightlight_server'
+lient_telemetry_topic = id + '/telemetry'
+client_name = id + 'nightlight_server'
+server_command_topic = id + '/commands'
 
 mqtt_client = mqtt.Client(client_name)
 mqtt_client.connect('test.mosquitto.org')
@@ -16,7 +17,10 @@ mqtt_client.loop_start()
 def handle_telemetry(client, userdata, message):
     payload = json.loads(message.payload.decode())
     print("Message received:", payload)
-
+    command = { 'led_on' : payload['light'] < 200 }
+    print("Sending message:", command)
+    client.publish(server_command_topic, json.dumps(command))
+    
 mqtt_client.subscribe(client_telemetry_topic)
 mqtt_client.on_message = handle_telemetry