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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.net.SocketAddress;
import java.util.Date;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.MessageEvent;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class CalAmpProtocolDecoder extends BaseProtocolDecoder {
public CalAmpProtocolDecoder(CalAmpProtocol protocol) {
super(protocol);
}
private static final int MSG_NULL = 0;
private static final int MSG_ACK = 1;
private static final int MSG_EVENT_REPORT = 2;
private static final int MSG_ID_REPORT = 3;
private static final int MSG_USER_DATA = 4;
private static final int MSG_APP_DATA = 5;
private static final int MSG_CONFIG = 6;
private static final int MSG_UNIT_REQUEST = 7;
private static final int MSG_LOCATE_REPORT = 8;
private static final int MSG_USER_DATA_ACC = 9;
private static final int MSG_MINI_EVENT_REPORT = 10;
private static final int MSG_MINI_USER_DATA = 11;
private static final int SERVICE_UNACKNOWLEDGED = 0;
private static final int SERVICE_ACKNOWLEDGED = 1;
private static final int SERVICE_RESPONSE = 2;
@Override
public void handleUpstream(
ChannelHandlerContext ctx, ChannelEvent evt)
throws Exception {
if (!(evt instanceof MessageEvent)) {
ctx.sendUpstream(evt);
return;
}
MessageEvent e = (MessageEvent) evt;
Object decodedMessage = decode(ctx, e.getChannel(), e.getMessage(), e.getRemoteAddress());
if (decodedMessage != null) {
Channels.fireMessageReceived(ctx, decodedMessage, e.getRemoteAddress());
}
}
private void sendResponse(Channel channel, SocketAddress remoteAddress, int type, int index, int result) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(10);
response.writeByte(SERVICE_RESPONSE);
response.writeByte(MSG_ACK);
response.writeShort(index);
response.writeByte(type);
response.writeByte(result);
response.writeByte(0);
response.writeMedium(0);
channel.write(response, remoteAddress);
}
}
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg, SocketAddress remoteAddress)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
// Check options header
if ((buf.getByte(buf.readerIndex()) & 0x80) != 0) {
int content = buf.readUnsignedByte();
// Identifier
if ((content & 0x01) != 0) {
// Read identifier
int length = buf.readUnsignedByte();
long id = 0;
for (int i = 0; i < length; i++) {
int b = buf.readUnsignedByte();
id = id * 10 + (b >> 4);
if ((b & 0xf) != 0xf) {
id = id * 10 + (b & 0xf);
}
}
identify(String.valueOf(id), channel, remoteAddress);
}
// Identifier type
if ((content & 0x02) != 0) {
buf.skipBytes(buf.readUnsignedByte());
}
// Authentication
if ((content & 0x04) != 0) {
buf.skipBytes(buf.readUnsignedByte());
}
// Routing
if ((content & 0x08) != 0) {
buf.skipBytes(buf.readUnsignedByte());
}
// Forwarding
if ((content & 0x10) != 0) {
buf.skipBytes(buf.readUnsignedByte());
}
// Responce redirection
if ((content & 0x20) != 0) {
buf.skipBytes(buf.readUnsignedByte());
}
}
// Unidentified device
if (!hasDeviceId()) {
return null;
}
int service = buf.readUnsignedByte();
int type = buf.readUnsignedByte();
int index = buf.readUnsignedShort();
// Send acknowledgement
if (service == SERVICE_ACKNOWLEDGED) {
sendResponse(channel, remoteAddress, type, index, 0);
}
if (type == MSG_EVENT_REPORT ||
type == MSG_LOCATE_REPORT ||
type == MSG_MINI_EVENT_REPORT) {
// Create new position
Position position = new Position();
position.setDeviceId(getDeviceId());
position.setProtocol(getProtocolName());
// Location data
position.setTime(new Date(buf.readUnsignedInt() * 1000));
if (type != MSG_MINI_EVENT_REPORT) {
buf.readUnsignedInt(); // fix time
}
position.setLatitude(buf.readInt() * 0.0000001);
position.setLongitude(buf.readInt() * 0.0000001);
if (type != MSG_MINI_EVENT_REPORT) {
position.setAltitude(buf.readInt() * 0.01);
position.setSpeed(UnitsConverter.knotsFromCps(buf.readUnsignedInt()));
}
position.setCourse(buf.readShort());
if (type == MSG_MINI_EVENT_REPORT) {
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte()));
}
// Fix status
if (type == MSG_MINI_EVENT_REPORT) {
position.set(Event.KEY_SATELLITES, buf.getUnsignedByte(buf.readerIndex()) & 0xf);
position.setValid((buf.readUnsignedByte() & 0x20) == 0);
} else {
position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
position.setValid((buf.readUnsignedByte() & 0x08) == 0);
}
if (type != MSG_MINI_EVENT_REPORT) {
// Carrier
position.set("carrier", buf.readUnsignedShort());
// Cell signal
position.set(Event.KEY_GSM, buf.readShort());
}
// Modem state
position.set("modem", buf.readUnsignedByte());
// HDOP
if (type != MSG_MINI_EVENT_REPORT) {
position.set(Event.KEY_HDOP, buf.readUnsignedByte());
}
// Inputs
position.set(Event.KEY_INPUT, buf.readUnsignedByte());
// Unit status
if (type != MSG_MINI_EVENT_REPORT) {
position.set(Event.KEY_STATUS, buf.readUnsignedByte());
}
// Event code and status
if (type == MSG_EVENT_REPORT || type == MSG_MINI_EVENT_REPORT) {
position.set(Event.KEY_EVENT, buf.readUnsignedByte() + " - " + buf.readUnsignedByte());
}
// Accumulators
int accCount = buf.readUnsignedByte();
int accType = accCount >> 6;
accCount &= 0x3f;
buf.readUnsignedByte(); // reserved
if (accType == 1) {
buf.readUnsignedInt(); // threshold
buf.readUnsignedInt(); // mask
}
for (int i = 0; i < accCount; i++) {
position.set("acc" + i, buf.readUnsignedInt());
}
return position;
}
return null;
}
}
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