Enhance POE project with health check server, sensor tracking, and dynamic MQTT topic structure. Updated configuration for multiple Modbus hosts and added alerting system for sensor failures and recoveries. Improved logging and error handling throughout the application.

health_check.py

@@ -0,0 +1,77 @@
+import json
+import threading
+from http.server import HTTPServer, BaseHTTPRequestHandler
+from datetime import datetime, timezone
+import logging
+
+from config import HEALTH_CHECK_PORT, HEALTH_CHECK_ENABLED
+
+class HealthCheckHandler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        if self.path == '/health':
+            self.send_health_response()
+        elif self.path == '/sensors':
+            self.send_sensors_status()
+        else:
+            self.send_response(404)
+            self.end_headers()
+
+    def send_health_response(self):
+        """Send basic health check response"""
+        health_data = {
+            "status": "healthy",
+            "timestamp": datetime.now(timezone.utc).isoformat(),
+            "service": "modbus-mqtt-bridge",
+            "version": "1.0.0"
+        }
+        
+        self.send_response(200)
+        self.send_header('Content-type', 'application/json')
+        self.end_headers()
+        self.wfile.write(json.dumps(health_data, indent=2).encode())
+
+    def send_sensors_status(self):
+        """Send detailed sensor status"""
+        # Get sensor status from the global sensor tracker
+        from sensor_tracker import get_all_sensor_status
+        
+        sensors_status = get_all_sensor_status()
+        
+        self.send_response(200)
+        self.send_header('Content-type', 'application/json')
+        self.end_headers()
+        self.wfile.write(json.dumps(sensors_status, indent=2).encode())
+
+    def log_message(self, format, *args):
+        """Override to use our logging system"""
+        logging.info(f"Health Check - {format % args}")
+
+class HealthCheckServer:
+    def __init__(self, port=HEALTH_CHECK_PORT):
+        self.port = port
+        self.server = None
+        self.thread = None
+
+    def start(self):
+        """Start the health check server in a separate thread"""
+        if not HEALTH_CHECK_ENABLED:
+            logging.info("Health check server is disabled")
+            return
+
+        try:
+            self.server = HTTPServer(('', self.port), HealthCheckHandler)
+            self.thread = threading.Thread(target=self.server.serve_forever, daemon=True)
+            self.thread.start()
+            logging.info(f"Health check server started on port {self.port}")
+            logging.info(f"Health check endpoints:")
+            logging.info(f"  - http://localhost:{self.port}/health")
+            logging.info(f"  - http://localhost:{self.port}/sensors")
+        except Exception as e:
+            logging.error(f"Failed to start health check server: {e}")
+
+    def stop(self):
+        """Stop the health check server"""
+        if self.server:
+            self.server.shutdown()
+            self.server.server_close()
+            logging.info("Health check server stopped")