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When resending QOS 1+ PUBLISH packets the DUP flag should be set #490

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merged 1 commit into from Mar 16, 2021
Merged

When resending QOS 1+ PUBLISH packets the DUP flag should be set #490

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13 changes: 11 additions & 2 deletions client.go
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Expand Up @@ -902,7 +902,7 @@ func (c *client) resume(subscription bool, ibound chan packets.ControlPacket) {
}
details := packet.Details()
if isKeyOutbound(key) {
switch packet.(type) {
switch p := packet.(type) {
case *packets.SubscribePacket:
if subscription {
DEBUG.Println(STR, fmt.Sprintf("loaded pending subscribe (%d)", details.MessageID))
Expand Down Expand Up @@ -942,13 +942,22 @@ func (c *client) resume(subscription bool, ibound chan packets.ControlPacket) {
return
}
case *packets.PublishPacket:
// spec: If the DUP flag is set to 0, it indicates that this is the first occasion that the Client or
// Server has attempted to send this MQTT PUBLISH Packet. If the DUP flag is set to 1, it indicates that
// this might be re-delivery of an earlier attempt to send the Packet.
//
// If the message is in the store than an attempt at delivery has been made (note that the message may
// never have made it onto the wire but tracking that would be complicated!).
if p.Qos != 0 { // spec: The DUP flag MUST be set to 0 for all QoS 0 messages
p.Dup = true
}
token := newToken(packets.Publish).(*PublishToken)
token.messageID = details.MessageID
c.claimID(token, details.MessageID)
DEBUG.Println(STR, fmt.Sprintf("loaded pending publish (%d)", details.MessageID))
DEBUG.Println(STR, details)
select {
case c.obound <- &PacketAndToken{p: packet, t: token}:
case c.obound <- &PacketAndToken{p: p, t: token}:
case <-c.stop:
DEBUG.Println(STR, "resume exiting due to stop")
return
Expand Down