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   1 /**
   2  * Copyright (c) 2010-2020 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.omnikinverter.internal;
  14
  15 import java.io.ByteArrayOutputStream;
  16 import java.io.IOException;
  17 import java.net.Socket;
  18 import java.net.UnknownHostException;
  19 import java.nio.ByteBuffer;
  20
  21 import org.apache.commons.lang.ArrayUtils;
  22 import org.eclipse.jdt.annotation.NonNullByDefault;
  23
  24 /**
  25  *
  26  * @author Hans van den Bogert - Initial Contribution
  27  *
  28  */
  29 @NonNullByDefault
  30 public class OmnikInverter {
  31
  32     private int serialNumber;
  33     private String host;
  34     private int port;
  35     private byte[] magicPacket;
  36
  37     public OmnikInverter(String host, int port, int serialNumber) throws IOException {
  38         this.host = host;
  39         this.port = port;
  40         this.serialNumber = serialNumber;
  41         this.magicPacket = generateMagicPacket();
  42     }
  43
  44     public OmnikInverterMessage pullCurrentStats() throws UnknownHostException, IOException {
  45         byte[] magicPacket = this.magicPacket;
  46         byte[] returnMessage = new byte[1024];
  47
  48         try (Socket socket = new Socket(host, port)) {
  49             socket.setSoTimeout(5000);
  50             socket.getOutputStream().write(magicPacket);
  51             socket.getInputStream().read(returnMessage);
  52
  53             return new OmnikInverterMessage(returnMessage);
  54         }
  55     }
  56
  57     private byte[] generateMagicPacket() throws IOException {
  58         byte[] magic = { 0x68, 0x02, 0x40, 0x30 };
  59
  60         ByteBuffer serialByteBuffer = ByteBuffer.allocate(8).putInt(serialNumber).putInt(serialNumber);
  61         byte[] serialBytes = serialByteBuffer.array();
  62         // Reverse serialBytes in a very mutable way.
  63         ArrayUtils.reverse(serialBytes);
  64
  65         byte checksumCount = 115;
  66         for (byte b : serialBytes) {
  67             checksumCount += (char) b;
  68         }
  69
  70         byte[] checksum = ByteBuffer.allocate(1).put(checksumCount).array();
  71
  72         try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
  73             outputStream.write(magic);
  74             outputStream.write(serialBytes);
  75             outputStream.write(0x01);
  76             outputStream.write(0x00);
  77             outputStream.write(checksum);
  78             outputStream.write(0x16);
  79
  80             return outputStream.toByteArray();
  81         }
  82     }
  83 }