133 lines
4.6 KiB
C#
133 lines
4.6 KiB
C#
/*
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Copyright (c) 2013, 2014 Paolo Patierno
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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 v1.0
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and Eclipse Distribution License v1.0 which accompany this distribution.
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The Eclipse Public License is available at
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http://www.eclipse.org/legal/epl-v10.html
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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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Contributors:
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Paolo Patierno - initial API and implementation and/or initial documentation
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*/
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using uPLibrary.Networking.M2Mqtt.Exceptions;
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namespace uPLibrary.Networking.M2Mqtt.Messages {
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/// <summary>
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/// Class for PUBREL message from client top broker
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/// </summary>
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public class MqttMsgPubrel : MqttMsgBase {
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/// <summary>
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/// Constructor
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/// </summary>
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public MqttMsgPubrel() {
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this.Type = MQTT_MSG_PUBREL_TYPE;
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// PUBREL message use QoS Level 1 (not "officially" in 3.1.1)
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this.QosLevel = QOS_LEVEL_AT_LEAST_ONCE;
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}
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public override System.Byte[] GetBytes(System.Byte protocolVersion) {
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System.Int32 varHeaderSize = 0;
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System.Int32 payloadSize = 0;
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System.Int32 remainingLength = 0;
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System.Byte[] buffer;
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System.Int32 index = 0;
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// message identifier
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varHeaderSize += MESSAGE_ID_SIZE;
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remainingLength += varHeaderSize + payloadSize;
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// first byte of fixed header
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System.Int32 fixedHeaderSize = 1;
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System.Int32 temp = remainingLength;
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// increase fixed header size based on remaining length
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// (each remaining length byte can encode until 128)
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do {
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fixedHeaderSize++;
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temp /= 128;
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} while (temp > 0);
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// allocate buffer for message
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buffer = new System.Byte[fixedHeaderSize + varHeaderSize + payloadSize];
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// first fixed header byte
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if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1) {
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buffer[index++] = (MQTT_MSG_PUBREL_TYPE << MSG_TYPE_OFFSET) | MQTT_MSG_PUBREL_FLAG_BITS; // [v.3.1.1]
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} else {
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buffer[index] = (System.Byte)((MQTT_MSG_PUBREL_TYPE << MSG_TYPE_OFFSET) |
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(this.QosLevel << QOS_LEVEL_OFFSET));
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buffer[index] |= this.DupFlag ? (System.Byte)(1 << DUP_FLAG_OFFSET) : (System.Byte)0x00;
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index++;
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}
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// encode remaining length
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index = this.EncodeRemainingLength(remainingLength, buffer, index);
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// get next message identifier
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buffer[index++] = (System.Byte)((this.MessageId >> 8) & 0x00FF); // MSB
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buffer[index++] = (System.Byte)(this.MessageId & 0x00FF); // LSB
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return buffer;
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}
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/// <summary>
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/// Parse bytes for a PUBREL message
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/// </summary>
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/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
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/// <param name="protocolVersion">Protocol Version</param>
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/// <param name="channel">Channel connected to the broker</param>
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/// <returns>PUBREL message instance</returns>
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public static MqttMsgPubrel Parse(System.Byte fixedHeaderFirstByte, System.Byte protocolVersion, IMqttNetworkChannel channel) {
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System.Byte[] buffer;
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System.Int32 index = 0;
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MqttMsgPubrel msg = new MqttMsgPubrel();
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if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1) {
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// [v3.1.1] check flag bits
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if ((fixedHeaderFirstByte & MSG_FLAG_BITS_MASK) != MQTT_MSG_PUBREL_FLAG_BITS) {
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throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
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}
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}
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// get remaining length and allocate buffer
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System.Int32 remainingLength = MqttMsgBase.DecodeRemainingLength(channel);
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buffer = new System.Byte[remainingLength];
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// read bytes from socket...
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_ = channel.Receive(buffer);
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if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1) {
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// only 3.1.0
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// read QoS level from fixed header (would be QoS Level 1)
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msg.QosLevel = (System.Byte)((fixedHeaderFirstByte & QOS_LEVEL_MASK) >> QOS_LEVEL_OFFSET);
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// read DUP flag from fixed header
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msg.DupFlag = (fixedHeaderFirstByte & DUP_FLAG_MASK) >> DUP_FLAG_OFFSET == 0x01;
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}
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// message id
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msg.MessageId = (System.UInt16)((buffer[index++] << 8) & 0xFF00);
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msg.MessageId |= buffer[index++];
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return msg;
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}
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public override System.String ToString() =>
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#if TRACE
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this.GetTraceString(
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"PUBREL",
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new System.Object[] { "messageId" },
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new System.Object[] { this.MessageId });
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#else
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base.ToString();
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#endif
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}
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}
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