feat: Enhance MQTT configuration with TLS/SSL support and update logging

config.yaml.example

@@ -164,28 +164,49 @@ duty_cycle:
   max_airtime_per_minute: 3600
 
 
+# MQTT Publishing Configuration (Optional)
+mqtt:
+  # Enable/disable MQTT publishing
+  enabled: false
+  
+  # MQTT broker settings
+  broker: "localhost"
+  port: 1883  # Use 8883 for TLS/SSL
+  
+  # Authentication (optional)
+  username: null
+  password: null
+  
+  # TLS/SSL configuration (optional)
+  # For public brokers with trusted certificates, just enable TLS:
+  # tls:
+  #   enabled: true
+  tls:
+    enabled: false
+    
+    # Advanced TLS options (usually not needed for public brokers):
+    
+    # Custom CA certificate for server verification
+    # Leave null to use system default CA certificates (recommended)
+    ca_cert: null  # e.g., "/etc/ssl/certs/ca-certificates.crt"
+    
+    # Client certificate and key for mutual TLS (rarely needed)
+    client_cert: null  # e.g., "/etc/pymc/client.crt"
+    client_key: null   # e.g., "/etc/pymc/client.key"
+    
+    # Skip certificate verification (insecure, not recommended)
+    insecure: false
+  
+  # Base topic for publishing
+  # Messages will be published to: {base_topic}/{node_name}/{packet|advert}
+  base_topic: "meshcore/repeater"
+
+
 # Storage Configuration
 storage:
   # Directory for persistent storage files (SQLite, RRD)
   storage_dir: "/var/lib/pymc_repeater"
 
-  # MQTT publishing configuration (optional)
-  mqtt:
-    # Enable/disable MQTT publishing
-    enabled: false
-    
-    # MQTT broker settings
-    broker: "localhost"
-    port: 1883
-    
-    # Authentication (optional)
-    username: null
-    password: null
-    
-    # Base topic for publishing
-    # Messages will be published to: {base_topic}/{node_name}/{packet|advert}
-    base_topic: "meshcore/repeater"
-
   # Data retention settings
   retention:
     # Clean up SQLite records older than this many days
@@ -197,9 +218,6 @@ storage:
     # - 1 hour resolution for 1 year
 
 
-
-
-
 letsmesh:
   enabled: false
   iata_code: "Test"  # e.g., "SFO", "LHR", "Test"

repeater/data_acquisition/mqtt_handler.py

@@ -1,5 +1,6 @@
 import json
 import logging
+import ssl
 from typing import Dict, Any, Optional
 
 try:
@@ -30,6 +31,38 @@ class MQTTHandler:
         try:
             self.client = mqtt.Client()
             
+            # Configure TLS/SSL if enabled
+            tls_config = self.mqtt_config.get("tls", {})
+            if tls_config.get("enabled", False):
+                tls_params = {
+                    "cert_reqs": ssl.CERT_REQUIRED,
+                    "tls_version": ssl.PROTOCOL_TLS,
+                }
+                
+                # CA certificate for server verification (optional - uses system certs if not specified)
+                ca_cert = tls_config.get("ca_cert")
+                if ca_cert:
+                    tls_params["ca_certs"] = ca_cert
+                    logger.info("Using custom CA certificate for MQTT TLS")
+                else:
+                    logger.info("Using system default CA certificates for MQTT TLS")
+                
+                # Client certificate and key (for mutual TLS)
+                client_cert = tls_config.get("client_cert")
+                client_key = tls_config.get("client_key")
+                if client_cert:
+                    tls_params["certfile"] = client_cert
+                if client_key:
+                    tls_params["keyfile"] = client_key
+                
+                # Allow insecure connections (skip cert verification)
+                if tls_config.get("insecure", False):
+                    tls_params["cert_reqs"] = ssl.CERT_NONE
+                    logger.warning("MQTT TLS certificate verification disabled (insecure mode)")
+                
+                self.client.tls_set(**tls_params)
+                logger.info("MQTT TLS/SSL configured")
+            
             username = self.mqtt_config.get("username")
             password = self.mqtt_config.get("password")
             if username:
@@ -41,7 +74,8 @@ class MQTTHandler:
             self.client.connect(broker, port, 60)
             self.client.loop_start()
             
-            logger.info(f"MQTT client connected to {broker}:{port}")
+            secure = "(TLS)" if tls_config.get("enabled", False) else ""
+            logger.info(f"MQTT client connected to {broker}:{port} {secure}")
             
         except Exception as e:
             logger.error(f"Failed to initialize MQTT: {e}")