fix client id mqtt

app/mqtt/client.py

@@ -1,5 +1,7 @@
 import json
 import logging
+import socket
+import time
 from typing import Callable, Optional
 import paho.mqtt.client as mqtt
 
@@ -12,8 +14,15 @@ class MQTTClient:
     """Client MQTT per ricevere allarmi dal sistema di monitoraggio"""
 
     def __init__(self, message_handler: Optional[Callable] = None):
-        self.client = mqtt.Client(client_id="terrain_monitor_backend")
+        # Genera un client_id unico basato su hostname + timestamp
+        # Questo permette di avere più istanze del backend senza conflitti
+        hostname = socket.gethostname()
+        timestamp = int(time.time() * 1000)  # milliseconds
+        client_id = f"terrain_backend_{hostname}_{timestamp}"
+
+        self.client = mqtt.Client(client_id=client_id)
         self.message_handler = message_handler
+        logger.info(f"Client MQTT creato con ID: {client_id}")
         self._setup_callbacks()
 
     def _setup_callbacks(self):