fix: 修复 CMPP 协议字段容量与版本兼容性

gateway/internal/upstream/deliver.go

@@ -15,6 +15,7 @@ import (
 // mobile-originated content uses a separate long-message assembly path.
 
 type deliverPacket struct {
+	version          cmpp.Type
 	seqID            uint32
 	msgID            uint64
 	destID           string
@@ -26,7 +27,7 @@ type deliverPacket struct {
 }
 
 func deliverPacketFromCMPP2(pkt *cmpp.Cmpp2DeliverReqPkt) deliverPacket {
-	return deliverPacket{
+	return deliverPacket{version: cmpp.V20,
 		seqID:            pkt.SeqId,
 		msgID:            pkt.MsgId,
 		destID:           pkt.DestId,
@@ -39,7 +40,7 @@ func deliverPacketFromCMPP2(pkt *cmpp.Cmpp2DeliverReqPkt) deliverPacket {
 }
 
 func deliverPacketFromCMPP3(pkt *cmpp.Cmpp3DeliverReqPkt) deliverPacket {
-	return deliverPacket{
+	return deliverPacket{version: cmpp.V30,
 		seqID:            pkt.SeqId,
 		msgID:            pkt.MsgId,
 		destID:           pkt.DestId,
@@ -54,7 +55,7 @@ func deliverPacketFromCMPP3(pkt *cmpp.Cmpp3DeliverReqPkt) deliverPacket {
 func (c *connection) handleDeliver(pkt deliverPacket) error {
 	if pkt.registerDelivery == 1 {
 		var receipt cmpp.CmppReceiptPkt
-		if err := receipt.Unpack([]byte(pkt.msgContent)); err != nil {
+		if err := receipt.UnpackVersion([]byte(pkt.msgContent), pkt.version); err != nil {
 			log.Printf("protocol_event protocol=cmpp direction=channel_to_platform event=deliver_receipt status=parse_failed channel_id=%s sequence_id=%d packet_msg_id=%d error=%q", c.channelID, pkt.seqID, pkt.msgID, err)
 			return err
 		}