Added ssl/tls support

config/config.go

@@ -13,6 +13,7 @@ type Config struct {
 	Username string
 	Password string
 	Topics   []string
+	CACert   string
 }
 
 func NewConfig(logger *zap.Logger) *Config {
@@ -51,10 +52,16 @@ func NewConfig(logger *zap.Logger) *Config {
 		}
 	}
 
+	caCert := os.Getenv("MQTT_CACERT")
+	if caCert == "" {
+		logger.Warn("MQTT_CACERT is not set, not using TLS")
+	}
+
 	return &Config{
 		URI:      uri,
 		Username: username,
 		Password: password,
 		Topics:   topics,
+		CACert:   caCert,
 	}
 }