update

pkg/mqtt/connection.go

@@ -287,8 +287,6 @@ func (c *Connection) RcvMsgFromClient() {
 
 		case *Subscribe:
 			server.Log.Infof("%s, subscribe topic: %v", c.DeviceCode, msg.Topics)
-			subAck := SubAck{MessageID: msg.MessageID}
-			c.Submit(&subAck)
 
 		case *Unsubscribe:
 			server.Log.Infof("%s, unsubscribe topic: %v", host, msg.Topics)