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/*
* Copyright 2015 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 java.nio.ByteOrder;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.database.DataManager;
import org.traccar.helper.Log;
import org.traccar.model.ExtendedInfoFormatter;
import org.traccar.model.Position;
public class BceProtocolDecoder extends BaseProtocolDecoder {
public BceProtocolDecoder(String protocol) {
super(protocol);
}
private static final int DATA_TYPE = 7;
private static final int MSG_ASYNC_STACK = 0xA5;
private static final int MSG_STACK_COFIRM = 0x19;
private static final int MSG_TIME_TRIGGERED = 0xA0;
private static final int MSG_OUTPUT_CONTROL = 0x41;
private static final int MSG_OUTPUT_CONTROL_ACK = 0xC1;
private static boolean checkBit(int mask, int bit) {
return (mask & (1 << bit)) != 0;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
String imei = String.format("%015d", buf.readLong());
if (!identify(imei)) {
return null;
}
List<Position> positions = new LinkedList<Position>();
while (buf.readableBytes() > 1) {
int dataEnd = buf.readUnsignedShort() + buf.readerIndex();
int type = buf.readUnsignedByte();
int confirmKey = buf.readUnsignedByte();
while (buf.readerIndex() < dataEnd) {
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter(getProtocol());
position.setDeviceId(getDeviceId());
int structEnd = buf.readUnsignedByte() + buf.readerIndex();
long time = buf.readUnsignedInt();
if ((time & 0x0f) == DATA_TYPE) {
time = time >> 4 << 1;
time += 0x47798280; // 01/01/2008
position.setTime(new Date(time * 1000));
// Read masks
int mask;
List<Integer> masks = new LinkedList<Integer>();
do {
mask = buf.readUnsignedShort();
masks.add(mask);
} while (checkBit(mask, 15));
mask = masks.get(0);
if (checkBit(mask, 0)) {
position.setValid(true);
position.setLongitude((double) buf.readFloat());
position.setLatitude((double) buf.readFloat());
position.setSpeed((double) buf.readUnsignedByte());
int gps = buf.readUnsignedByte();
extendedInfo.set("satellites", gps & 0xf);
extendedInfo.set("hdop", gps >> 4);
position.setCourse((double) buf.readUnsignedByte());
position.setAltitude((double) buf.readUnsignedShort());
extendedInfo.set("milage", buf.readUnsignedInt());
position.setExtendedInfo(extendedInfo.toString());
}
if (checkBit(mask, 1)) {
extendedInfo.set("input", buf.readUnsignedShort());
}
for (int i = 1; i <= 8; i++) {
if (checkBit(mask, i + 1)) {
extendedInfo.set("adc" + i, buf.readUnsignedShort());
}
}
if (checkBit(mask, 10)) buf.skipBytes(4);
if (checkBit(mask, 11)) buf.skipBytes(4);
if (checkBit(mask, 12)) buf.skipBytes(2);
if (checkBit(mask, 13)) buf.skipBytes(2);
if (checkBit(mask, 14)) {
extendedInfo.set("mcc", buf.readUnsignedShort());
extendedInfo.set("mnc", buf.readUnsignedByte());
extendedInfo.set("lac", buf.readUnsignedShort());
extendedInfo.set("cell", buf.readUnsignedShort());
extendedInfo.set("gsm", buf.readUnsignedByte());
buf.readUnsignedByte();
}
if (checkBit(mask, 0)) {
positions.add(position);
}
}
buf.readerIndex(structEnd);
}
// Send response
if (type == MSG_ASYNC_STACK && channel != null) {
ChannelBuffer response = ChannelBuffers.buffer(ByteOrder.LITTLE_ENDIAN, 8 + 2 + 2 + 1);
response.writeLong(Long.valueOf(imei));
response.writeShort(2);
response.writeByte(MSG_STACK_COFIRM);
response.writeByte(confirmKey);
int checksum = 0;
for (int i = 0; i < response.writerIndex(); i++) {
checksum += response.getUnsignedByte(i);
}
response.writeByte(checksum);
channel.write(response);
}
}
return positions;
}
}
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