subscribe: set client_id for MQTT subscriber to ensure unique identification

internal/handler/mqttping.go

@@ -5,8 +5,8 @@ import (
 	"os"
 	"time"
 
-    "github.com/gin-gonic/gin"
 	"git.piskot.si/SeminarM2/lambdaiot-core/internal/mqtt"
+	"github.com/gin-gonic/gin"
 )
 
 // MQTTPing publishes the current timestamp to the configured MQTT topic

test/subscribe.py

@@ -32,6 +32,7 @@ client.on_connect = on_connect
 client.on_message = on_message
 if username:
     client.username_pw_set(username, password)
+    client.client_id = f"subscribe-{os.getpid()}"
 
 try:
     client.connect(host, port, 60)