Added aditional comments

internal/mqtt/mqtt.go

@@ -18,6 +18,8 @@ func NewClient(logger *zap.Logger, config *config.Config, csvHelper *csv.Helper)
 	opts.SetKeepAlive(2 * time.Second)
 	opts.SetDefaultPublishHandler(f)
 	opts.SetPingTimeout(1 * time.Second)
+	// TODO: Check this option and see if it solves the re-subscribe on reconnect issue
+	// opts.SetCleanSession(false)
 	opts.SetConnectionNotificationHandler(func(client mqtt.Client, notification mqtt.ConnectionNotification) {
 		switch n := notification.(type) {
 		case mqtt.ConnectionNotificationConnected: