/// <summary> /// Constructor /// </summary> /// <param name="msg">CONNECT message received from client</param> public MqttMsgConnectEventArgs(MqttMsgConnect connect) { this.Message = connect; }
/// <summary> /// Parse bytes for a CONNECT message /// </summary> /// <param name="fixedHeaderFirstByte">First fixed header byte</param> /// <param name="protocolVersion">Protocol Version</param> /// <param name="channel">Channel connected to the broker</param> /// <returns>CONNECT message instance</returns> public static MqttMsgConnect Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel) { byte[] buffer; int index = 0; int protNameUtf8Length; byte[] protNameUtf8; bool isUsernameFlag; bool isPasswordFlag; int clientIdUtf8Length; byte[] clientIdUtf8; int willTopicUtf8Length; byte[] willTopicUtf8; int willMessageUtf8Length; byte[] willMessageUtf8; int usernameUtf8Length; byte[] usernameUtf8; int passwordUtf8Length; byte[] passwordUtf8; MqttMsgConnect msg = new MqttMsgConnect(); // get remaining length and allocate buffer int remainingLength = MqttMsgBase.decodeRemainingLength(channel); buffer = new byte[remainingLength]; // read bytes from socket... channel.Receive(buffer); // protocol name protNameUtf8Length = ((buffer[index++] << 8) & 0xFF00); protNameUtf8Length |= buffer[index++]; protNameUtf8 = new byte[protNameUtf8Length]; Array.Copy(buffer, index, protNameUtf8, 0, protNameUtf8Length); index += protNameUtf8Length; msg.protocolName = new String(Encoding.UTF8.GetChars(protNameUtf8)); // [v3.1.1] wrong protocol name if (!msg.protocolName.Equals(PROTOCOL_NAME_V3_1) && !msg.protocolName.Equals(PROTOCOL_NAME_V3_1_1)) { throw new MqttClientException(MqttClientErrorCode.InvalidProtocolName); } // protocol version msg.protocolVersion = buffer[index]; index += PROTOCOL_VERSION_SIZE; // connect flags // [v3.1.1] check lsb (reserved) must be 0 if ((msg.protocolVersion == PROTOCOL_VERSION_V3_1_1) && ((buffer[index] & RESERVED_FLAG_MASK) != 0x00)) { throw new MqttClientException(MqttClientErrorCode.InvalidConnectFlags); } isUsernameFlag = (buffer[index] & USERNAME_FLAG_MASK) != 0x00; isPasswordFlag = (buffer[index] & PASSWORD_FLAG_MASK) != 0x00; msg.willRetain = (buffer[index] & WILL_RETAIN_FLAG_MASK) != 0x00; msg.willQosLevel = (byte)((buffer[index] & WILL_QOS_FLAG_MASK) >> WILL_QOS_FLAG_OFFSET); msg.willFlag = (buffer[index] & WILL_FLAG_MASK) != 0x00; msg.cleanSession = (buffer[index] & CLEAN_SESSION_FLAG_MASK) != 0x00; index += CONNECT_FLAGS_SIZE; // keep alive timer msg.keepAlivePeriod = (ushort)((buffer[index++] << 8) & 0xFF00); msg.keepAlivePeriod |= buffer[index++]; // client identifier [v3.1.1] it may be zero bytes long (empty string) clientIdUtf8Length = ((buffer[index++] << 8) & 0xFF00); clientIdUtf8Length |= buffer[index++]; clientIdUtf8 = new byte[clientIdUtf8Length]; Array.Copy(buffer, index, clientIdUtf8, 0, clientIdUtf8Length); index += clientIdUtf8Length; msg.clientId = new String(Encoding.UTF8.GetChars(clientIdUtf8)); // [v3.1.1] if client identifier is zero bytes long, clean session must be true if ((msg.protocolVersion == PROTOCOL_VERSION_V3_1_1) && (clientIdUtf8Length == 0) && (!msg.cleanSession)) { throw new MqttClientException(MqttClientErrorCode.InvalidClientId); } // will topic and will message if (msg.willFlag) { willTopicUtf8Length = ((buffer[index++] << 8) & 0xFF00); willTopicUtf8Length |= buffer[index++]; willTopicUtf8 = new byte[willTopicUtf8Length]; Array.Copy(buffer, index, willTopicUtf8, 0, willTopicUtf8Length); index += willTopicUtf8Length; msg.willTopic = new String(Encoding.UTF8.GetChars(willTopicUtf8)); willMessageUtf8Length = ((buffer[index++] << 8) & 0xFF00); willMessageUtf8Length |= buffer[index++]; willMessageUtf8 = new byte[willMessageUtf8Length]; Array.Copy(buffer, index, willMessageUtf8, 0, willMessageUtf8Length); index += willMessageUtf8Length; msg.willMessage = new String(Encoding.UTF8.GetChars(willMessageUtf8)); } // username if (isUsernameFlag) { usernameUtf8Length = ((buffer[index++] << 8) & 0xFF00); usernameUtf8Length |= buffer[index++]; usernameUtf8 = new byte[usernameUtf8Length]; Array.Copy(buffer, index, usernameUtf8, 0, usernameUtf8Length); index += usernameUtf8Length; msg.username = new String(Encoding.UTF8.GetChars(usernameUtf8)); } // password if (isPasswordFlag) { passwordUtf8Length = ((buffer[index++] << 8) & 0xFF00); passwordUtf8Length |= buffer[index++]; passwordUtf8 = new byte[passwordUtf8Length]; Array.Copy(buffer, index, passwordUtf8, 0, passwordUtf8Length); index += passwordUtf8Length; msg.password = new String(Encoding.UTF8.GetChars(passwordUtf8)); } return(msg); }