61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
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package packets
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import (
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"bytes"
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"fmt"
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"io"
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)
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//SubackPacket is an internal representation of the fields of the
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//Suback MQTT packet
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type SubackPacket struct {
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FixedHeader
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MessageID uint16
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ReturnCodes []byte
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}
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func (sa *SubackPacket) String() string {
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str := fmt.Sprintf("%s", sa.FixedHeader)
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str += " "
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str += fmt.Sprintf("MessageID: %d", sa.MessageID)
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return str
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}
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func (sa *SubackPacket) Write(w io.Writer) error {
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var body bytes.Buffer
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var err error
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body.Write(encodeUint16(sa.MessageID))
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body.Write(sa.ReturnCodes)
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sa.FixedHeader.RemainingLength = body.Len()
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packet := sa.FixedHeader.pack()
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packet.Write(body.Bytes())
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_, err = packet.WriteTo(w)
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return err
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}
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//Unpack decodes the details of a ControlPacket after the fixed
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//header has been read
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func (sa *SubackPacket) Unpack(b io.Reader) error {
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var qosBuffer bytes.Buffer
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var err error
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sa.MessageID, err = decodeUint16(b)
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if err != nil {
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return err
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}
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_, err = qosBuffer.ReadFrom(b)
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if err != nil {
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return err
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}
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sa.ReturnCodes = qosBuffer.Bytes()
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return nil
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}
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//Details returns a Details struct containing the Qos and
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//MessageID of this ControlPacket
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func (sa *SubackPacket) Details() Details {
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return Details{Qos: 0, MessageID: sa.MessageID}
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}
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