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/*
* Copyright 2013 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.DateBuilder;
import org.traccar.model.Position;
import java.net.SocketAddress;
public class M2mProtocolDecoder extends BaseProtocolDecoder {
public M2mProtocolDecoder(M2mProtocol protocol) {
super(protocol);
}
private boolean firstPacket = true;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
// Remove offset
for (int i = 0; i < buf.readableBytes(); i++) {
int b = buf.getByte(i);
if (b != 0x0b) {
buf.setByte(i, b - 0x20);
}
}
if (firstPacket) {
firstPacket = false;
StringBuilder imei = new StringBuilder();
for (int i = 0; i < 8; i++) {
int b = buf.readByte();
if (i != 0) {
imei.append(b / 10);
}
imei.append(b % 10);
}
getDeviceSession(channel, remoteAddress, imei.toString());
} else {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setDay(buf.readUnsignedByte() & 0x3f)
.setMonth(buf.readUnsignedByte() & 0x3f)
.setYear(buf.readUnsignedByte())
.setHour(buf.readUnsignedByte() & 0x3f)
.setMinute(buf.readUnsignedByte() & 0x7f)
.setSecond(buf.readUnsignedByte() & 0x7f);
position.setTime(dateBuilder.getDate());
int degrees = buf.readUnsignedByte();
double latitude = buf.readUnsignedByte();
latitude += buf.readUnsignedByte() / 100.0;
latitude += buf.readUnsignedByte() / 10000.0;
latitude /= 60;
latitude += degrees;
int b = buf.readUnsignedByte();
degrees = (b & 0x7f) * 100 + buf.readUnsignedByte();
double longitude = buf.readUnsignedByte();
longitude += buf.readUnsignedByte() / 100.0;
longitude += buf.readUnsignedByte() / 10000.0;
longitude /= 60;
longitude += degrees;
if ((b & 0x80) != 0) {
longitude = -longitude;
}
if ((b & 0x40) != 0) {
latitude = -latitude;
}
position.setValid(true);
position.setLatitude(latitude);
position.setLongitude(longitude);
position.setSpeed(buf.readUnsignedByte());
int satellites = buf.readUnsignedByte();
if (satellites == 0) {
return null; // cell information
}
position.set(Position.KEY_SATELLITES, satellites);
// decode other data
return position;
}
return null;
}
}
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