Fix topic parsing from env

config/config.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"os"
+	"strings"
 
 	"github.com/joho/godotenv"
 	"go.uber.org/zap"
@@ -35,16 +36,25 @@ func NewConfig(logger *zap.Logger) *Config {
 		logger.Warn("MQTT_PASSWORD is not set")
 	}
 
-	topics := os.Getenv("MQTT_TOPICS")
-	if topics == "" {
+	topicsEnv := os.Getenv("MQTT_TOPICS")
+	var topics []string
+	if topicsEnv == "" {
 		logger.Warn("MQTT_TOPICS is not set, defaulting to #")
-		topics = "#"
+		topics = []string{"#"}
+	} else {
+		parts := strings.Split(topicsEnv, ",")
+		for _, p := range parts {
+			t := strings.TrimSpace(p)
+			if t != "" {
+				topics = append(topics, t)
+			}
+		}
 	}
 
 	return &Config{
 		URI:      uri,
 		Username: username,
 		Password: password,
-		Topics:   []string{topics},
+		Topics:   topics,
 	}
 }