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69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
/*
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* Copyright (c) 2021 IBM Corp and others.
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*
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v2.0
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* and Eclipse Distribution License v1.0 which accompany this distribution.
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*
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* The Eclipse Public License is available at
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* https://www.eclipse.org/legal/epl-2.0/
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* and the Eclipse Distribution License is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* Contributors:
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* Allan Stockdill-Mander
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*/
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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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// ConnackPacket is an internal representation of the fields of the
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// Connack MQTT packet
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type ConnackPacket struct {
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FixedHeader
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SessionPresent bool
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ReturnCode byte
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}
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func (ca *ConnackPacket) String() string {
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return fmt.Sprintf("%s sessionpresent: %t returncode: %d", ca.FixedHeader, ca.SessionPresent, ca.ReturnCode)
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}
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func (ca *ConnackPacket) 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.WriteByte(boolToByte(ca.SessionPresent))
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body.WriteByte(ca.ReturnCode)
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ca.FixedHeader.RemainingLength = 2
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packet := ca.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 (ca *ConnackPacket) Unpack(b io.Reader) error {
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flags, err := decodeByte(b)
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if err != nil {
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return err
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}
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ca.SessionPresent = 1&flags > 0
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ca.ReturnCode, err = decodeByte(b)
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return err
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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 (ca *ConnackPacket) Details() Details {
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return Details{Qos: 0, MessageID: 0}
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}
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