diff --git a/health_probe_simulator.py b/health_probe_simulator.py
index 143a2e3..ec3b920 100644
--- a/health_probe_simulator.py
+++ b/health_probe_simulator.py
@@ -63,13 +63,16 @@ class DeviceProbeSimulator:
             return False
         
         try:
+            # ONLY send the exact format requested: {type:"heartbeat", key:"device_id"}
             payload = {
                 'type': 'heartbeat',
-                'key': device['unique_key']  # Use the device's unique key
+                'key': str(device_id)  # Use device_id as the key
             }
             
+            print(f"📡 Sending heartbeat: {payload}")
+            
             response = self.session.post(
-                f"{self.api_base_url}/devices/heartbeat",
+                f"{self.api_base_url}/heartbeat",  # Changed to correct endpoint
                 json=payload,
                 timeout=10
             )
diff --git a/test_drone_data.py b/test_drone_data.py
index 72b4c50..df468f3 100644
--- a/test_drone_data.py
+++ b/test_drone_data.py
@@ -267,14 +267,7 @@ def send_heartbeat(device_id):
     
     heartbeat_data = {
         "type": "heartbeat",
-        "key": f"device_{device_id}",
-        "device_id": device_id,
-        "signal_strength": random.randint(-70, -30),  # Simulate signal strength
-        "battery_level": random.randint(70, 100),     # Simulate battery level
-        "temperature": random.randint(20, 45),        # Simulate temperature
-        "uptime": random.randint(3600, 86400),        # Simulate uptime
-        "memory_usage": random.randint(30, 80),       # Simulate memory usage
-        "firmware_version": "1.0.0"
+        "key": str(device_id)
     }
     
     # Debug output for heartbeat