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/*
* Copyright 2012 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.BitUtil;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Date;
public class AdmProtocolDecoder extends BaseProtocolDecoder {
public AdmProtocolDecoder(AdmProtocol protocol) {
super(protocol);
}
public static final int MSG_IMEI = 0x03;
public static final int MSG_PHOTO = 0x0A;
public static final int MSG_ADM5 = 0x01;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.readUnsignedShort(); // device id
buf.readUnsignedByte(); // length
int type = buf.readUnsignedByte();
DeviceSession deviceSession;
if (type == MSG_IMEI) {
deviceSession = getDeviceSession(
channel, remoteAddress, buf.readBytes(15).toString(StandardCharsets.US_ASCII));
} else {
deviceSession = getDeviceSession(channel, remoteAddress);
}
if (deviceSession == null) {
return null;
}
if (BitUtil.to(type, 2) == 0) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
buf.readUnsignedByte(); // firmware version
buf.readUnsignedShort(); // index
position.set(Position.KEY_STATUS, buf.readUnsignedShort());
position.setValid(true);
position.setLatitude(buf.readFloat());
position.setLongitude(buf.readFloat());
position.setCourse(buf.readUnsignedShort() * 0.1);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort() * 0.1));
buf.readUnsignedByte(); // acceleration
position.setAltitude(buf.readUnsignedShort());
position.set(Position.KEY_HDOP, buf.readUnsignedByte() * 0.1);
position.set(Position.KEY_SATELLITES, buf.readUnsignedByte() & 0x0f);
position.setTime(new Date(buf.readUnsignedInt() * 1000));
position.set(Position.KEY_POWER, buf.readUnsignedShort());
position.set(Position.KEY_BATTERY, buf.readUnsignedShort());
if (BitUtil.check(type, 2)) {
buf.skipBytes(4);
}
if (BitUtil.check(type, 3)) {
buf.skipBytes(12);
}
if (BitUtil.check(type, 4)) {
buf.skipBytes(8);
}
if (BitUtil.check(type, 5)) {
buf.skipBytes(9);
}
if (BitUtil.check(type, 6)) {
buf.skipBytes(buf.getUnsignedByte(buf.readerIndex()));
}
if (BitUtil.check(type, 7)) {
position.set(Position.KEY_ODOMETER, buf.readUnsignedInt());
}
return position;
}
return null;
}
}
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