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/*
* Copyright 2013 - 2020 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.protocol;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BcdUtil;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class GatorProtocolDecoder extends BaseProtocolDecoder {
public GatorProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_HEARTBEAT = 0x21;
public static final int MSG_POSITION_DATA = 0x80;
public static final int MSG_ROLLCALL_RESPONSE = 0x81;
public static final int MSG_ALARM_DATA = 0x82;
public static final int MSG_TERMINAL_STATUS = 0x83;
public static final int MSG_MESSAGE = 0x84;
public static final int MSG_TERMINAL_ANSWER = 0x85;
public static final int MSG_BLIND_AREA = 0x8E;
public static final int MSG_PICTURE_FRAME = 0x54;
public static final int MSG_CAMERA_RESPONSE = 0x56;
public static final int MSG_PICTURE_DATA = 0x57;
public static String decodeId(int b1, int b2, int b3, int b4) {
int d1 = 30 + ((b1 >> 7) << 3) + ((b2 >> 7) << 2) + ((b3 >> 7) << 1) + (b4 >> 7);
int d2 = b1 & 0x7f;
int d3 = b2 & 0x7f;
int d4 = b3 & 0x7f;
int d5 = b4 & 0x7f;
return String.format("%02d%02d%02d%02d%02d", d1, d2, d3, d4, d5);
}
private void sendResponse(Channel channel, SocketAddress remoteAddress, int type, int checksum) {
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(0x2424); // header
response.writeByte(MSG_HEARTBEAT);
response.writeShort(5); // length
response.writeByte(checksum);
response.writeByte(type);
response.writeByte(0); // subtype
response.writeByte(Checksum.xor(response.nioBuffer(2, response.writerIndex())));
response.writeByte(0x0D);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte();
buf.readUnsignedShort(); // length
String id = decodeId(
buf.readUnsignedByte(), buf.readUnsignedByte(),
buf.readUnsignedByte(), buf.readUnsignedByte());
sendResponse(channel, remoteAddress, type, buf.getByte(buf.writerIndex() - 2));
if (type == MSG_POSITION_DATA || type == MSG_ROLLCALL_RESPONSE
|| type == MSG_ALARM_DATA || type == MSG_BLIND_AREA) {
Position position = new Position(getProtocolName());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, "1" + id, id);
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setYear(BcdUtil.readInteger(buf, 2))
.setMonth(BcdUtil.readInteger(buf, 2))
.setDay(BcdUtil.readInteger(buf, 2))
.setHour(BcdUtil.readInteger(buf, 2))
.setMinute(BcdUtil.readInteger(buf, 2))
.setSecond(BcdUtil.readInteger(buf, 2));
position.setTime(dateBuilder.getDate());
position.setLatitude(BcdUtil.readCoordinate(buf));
position.setLongitude(BcdUtil.readCoordinate(buf));
position.setSpeed(UnitsConverter.knotsFromKph(BcdUtil.readInteger(buf, 4)));
position.setCourse(BcdUtil.readInteger(buf, 4));
int flags = buf.readUnsignedByte();
position.setValid((flags & 0x80) != 0);
position.set(Position.KEY_SATELLITES, flags & 0x0f);
position.set(Position.KEY_STATUS, buf.readUnsignedByte());
position.set("key", buf.readUnsignedByte());
position.set(Position.PREFIX_ADC + 1, buf.readUnsignedByte() + buf.readUnsignedByte() * 0.01);
position.set(Position.PREFIX_ADC + 2, buf.readUnsignedByte() + buf.readUnsignedByte() * 0.01);
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
return position;
}
return null;
}
}
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