Add Random ClientID string

mqtt_presence_redis_go/mqtt_presence_redis_go.go

@@ -7,7 +7,7 @@ import (
     "os"
     "strings"
     "time"
-    "strconv"
+    "crypto/rand"
 
     mqtt "github.com/eclipse/paho.mqtt.golang"
     "github.com/go-redis/redis/v8"
@@ -52,7 +52,7 @@ func main() {
     opts.AddBroker(fmt.Sprintf("tcp://%s:%s", mqttHost, mqttPort))
     opts.SetUsername(mqttUser)
     opts.SetPassword(mqttPass)
-    opts.SetClientID("mqtt_presence_redis_go")
+    opts.SetClientID(fmt.Sprintf("mqtt_presence_redis_go_%s", randomString()))
 
     // Handlers
     opts.SetDefaultPublishHandler(func(client mqtt.Client, msg mqtt.Message) {
@@ -114,10 +114,11 @@ func getEnv(key, defaultVal string) string {
     return defaultVal
 }
 
-func atoi(s string) int {
-    i, err := strconv.Atoi(s)
-    if err != nil {
-        return 0
+func randomString() string {
+    b := make([]byte, 4)
+    if _, err := rand.Read(b); err != nil {
+        log.Printf("Failed to generate random string: %v", err)
+        return ""
     }
-    return i
+    return hex.EncodeToString(b)
 }