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suback.go
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suback.go
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package mqttpackets
import (
"bytes"
"io"
"net"
)
// Suback is the Variable Header definition for a Suback control packet
type Suback struct {
Properties *Properties
Reasons []byte
PacketID uint16
}
// SubackGrantedQoS0, etc are the list of valid suback reason codes.
const (
SubackGrantedQoS0 = 0x00
SubackGrantedQoS1 = 0x01
SubackGrantedQoS2 = 0x02
SubackUnspecifiederror = 0x80
SubackImplementationspecificerror = 0x83
SubackNotauthorized = 0x87
SubackTopicFilterinvalid = 0x8F
SubackPacketIdentifierinuse = 0x91
SubackQuotaexceeded = 0x97
SubackSharedSubscriptionnotsupported = 0x9E
SubackSubscriptionIdentifiersnotsupported = 0xA1
SubackWildcardsubscriptionsnotsupported = 0xA2
)
//Unpack is the implementation of the interface required function for a packet
func (s *Suback) Unpack(r *bytes.Buffer) error {
var err error
s.PacketID, err = readUint16(r)
if err != nil {
return err
}
if s.Properties != nil {
err = s.Properties.Unpack(r, SUBACK)
if err != nil {
return err
}
}
s.Reasons = r.Bytes()
return nil
}
// Buffers is the implementation of the interface required function for a packet
func (s *Suback) Buffers() net.Buffers {
var b bytes.Buffer
writeUint16(s.PacketID, &b)
if s.Properties == nil {
return net.Buffers{b.Bytes(), s.Reasons}
}
idvp := s.Properties.Pack(SUBACK)
propLen := encodeVBI(len(idvp))
return net.Buffers{b.Bytes(), propLen, idvp, s.Reasons}
}
// WriteTo is the implementation of the interface required function for a packet
func (s *Suback) WriteTo(w io.Writer) (int64, error) {
cp := &ControlPacket{FixedHeader: FixedHeader{Type: SUBACK}}
cp.Content = s
return cp.WriteTo(w)
}
// Reason returns a string representation of the meaning of the ReasonCode
func (s *Suback) Reason(index int) string {
if index >= 0 && index < len(s.Reasons) {
switch s.Reasons[index] {
case 0:
return "Granted QoS 0 - The subscription is accepted and the maximum QoS sent will be QoS 0. This might be a lower QoS than was requested."
case 1:
return "Granted QoS 1 - The subscription is accepted and the maximum QoS sent will be QoS 1. This might be a lower QoS than was requested."
case 2:
return "Granted QoS 2 - The subscription is accepted and any received QoS will be sent to this subscription."
case 128:
return "Unspecified error - The subscription is not accepted and the Server either does not wish to reveal the reason or none of the other Reason Codes apply."
case 131:
return "Implementation specific error - The SUBSCRIBE is valid but the Server does not accept it."
case 135:
return "Not authorized - The Client is not authorized to make this subscription."
case 143:
return "Topic Filter invalid - The Topic Filter is correctly formed but is not allowed for this Client."
case 145:
return "Packet Identifier in use - The specified Packet Identifier is already in use."
case 151:
return "Quota exceeded - An implementation or administrative imposed limit has been exceeded."
case 158:
return "Shared Subscription not supported - The Server does not support Shared Subscriptions for this Client."
case 161:
return "Subscription Identifiers not supported - The Server does not support Subscription Identifiers; the subscription is not accepted."
case 162:
return "Wildcard subscriptions not supported - The Server does not support Wildcard subscription; the subscription is not accepted."
}
}
return "Invalid Reason index"
}