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/*
* Copyright 2016 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.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.DateBuilder;
import org.traccar.model.CellTower;
import org.traccar.model.Network;
import org.traccar.model.Position;
import org.traccar.model.WifiAccessPoint;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class SmokeyProtocolDecoder extends BaseProtocolDecoder {
public SmokeyProtocolDecoder(SmokeyProtocol protocol) {
super(protocol);
}
public static final int MSG_DATE_RECORD = 0;
public static final int MSG_DATE_RECORD_ACK = 1;
private static void sendResponse(
Channel channel, SocketAddress remoteAddress, ChannelBuffer id, int index, int report) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.dynamicBuffer();
response.writeBytes("SM".getBytes(StandardCharsets.US_ASCII));
response.writeByte(3); // protocol version
response.writeByte(MSG_DATE_RECORD_ACK);
response.writeBytes(id);
response.writeInt(0); // timestamp
response.writeByte(index);
response.writeByte(report - 0x200);
short checksum = (short) 0xF5A0;
for (int i = 0; i < response.readableBytes(); i += 2) {
checksum ^= ChannelBuffers.swapShort(response.getShort(i));
}
response.writeShort(checksum);
channel.write(response, remoteAddress);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
buf.readUnsignedByte(); // protocol version
int type = buf.readUnsignedByte();
ChannelBuffer id = buf.readBytes(8);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, ChannelBuffers.hexDump(id));
if (deviceSession == null) {
return null;
}
if (type == MSG_DATE_RECORD) {
buf.readUnsignedShort(); // firmware version
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
int status = buf.readUnsignedShort();
position.set(Position.KEY_STATUS, status);
DateBuilder dateBuilder = new DateBuilder()
.setDate(2000, 1, 1).addSeconds(buf.readUnsignedInt());
getLastLocation(position, dateBuilder.getDate());
int index = buf.readUnsignedByte();
position.set(Position.KEY_INDEX, index);
int report = buf.readUnsignedShort();
buf.readUnsignedShort(); // length
position.set(Position.KEY_BATTERY, buf.readUnsignedShort());
Network network = new Network();
if (report != 0x0203) {
int count = 1;
if (report != 0x0200) {
count = buf.readUnsignedByte();
}
for (int i = 0; i < count; i++) {
int mcc = buf.readUnsignedShort();
int mnc = buf.readUnsignedShort();
int lac = buf.readUnsignedShort();
int cid = buf.readUnsignedShort();
if (i == 0) {
buf.readByte(); // timing advance
}
int rssi = buf.readByte();
network.addCellTower(CellTower.from(mcc, mnc, lac, cid, rssi));
}
}
if (report == 0x0202 || report == 0x0203) {
int count = buf.readUnsignedByte();
for (int i = 0; i < count; i++) {
buf.readerIndex(buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0) + 1); // ssid
String mac = String.format("%02x:%02x:%02x:%02x:%02x:%02x",
buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte(),
buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte());
network.addWifiAccessPoint(WifiAccessPoint.from(mac, buf.readByte()));
}
}
position.setNetwork(network);
sendResponse(channel, remoteAddress, id, index, report);
return position;
}
return null;
}
}
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