diff --git a/health_probe_simulator.py b/health_probe_simulator.py
index 87a6d86..143a2e3 100644
--- a/health_probe_simulator.py
+++ b/health_probe_simulator.py
@@ -64,16 +64,8 @@ class DeviceProbeSimulator:
         
         try:
             payload = {
-                'device_id': device_id,
-                'timestamp': int(time.time()),
-                'status': 'online',
-                'system_info': {
-                    'cpu_usage': random.randint(20, 80),
-                    'memory_usage': random.randint(30, 90),
-                    'disk_usage': random.randint(40, 85),
-                    'temperature': random.randint(25, 65),
-                    'uptime': random.randint(3600, 86400)  # 1 hour to 1 day
-                }
+                'type': 'heartbeat',
+                'key': device['unique_key']  # Use the device's unique key
             }
             
             response = self.session.post(