diff options
Diffstat (limited to 'src/org/traccar/protocol/Gt06ProtocolDecoder.java')
| -rw-r--r-- | src/org/traccar/protocol/Gt06ProtocolDecoder.java | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/Gt06ProtocolDecoder.java b/src/org/traccar/protocol/Gt06ProtocolDecoder.java new file mode 100644 index 000000000..1daf6c4ec --- /dev/null +++ b/src/org/traccar/protocol/Gt06ProtocolDecoder.java @@ -0,0 +1,171 @@ +/* + * 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 java.util.Calendar; +import java.util.TimeZone; +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.GenericProtocolDecoder; +import org.traccar.helper.Crc; +import org.traccar.helper.Log; +import org.traccar.model.DataManager; +import org.traccar.model.Position; + +/** + * T55 tracker protocol decoder + */ +public class Gt06ProtocolDecoder extends GenericProtocolDecoder { + + private Long deviceId; + + /** + * Initialize + */ + public Gt06ProtocolDecoder(DataManager dataManager) { + super(dataManager); + } + + private String readImei(ChannelBuffer buf) { + int b = buf.readUnsignedByte(); + StringBuilder imei = new StringBuilder(); + imei.append(b & 0x0F); + for (int i = 0; i < 7; i++) { + b = buf.readUnsignedByte(); + imei.append((b & 0xF0) >> 4); + imei.append(b & 0x0F); + } + return imei.toString(); + } + + private static final int MSG_LOGIN = 0x01; + private static final int MSG_DATA = 0x12; + private static final int MSG_HEARTBEAT = 0x13; + private static final int MSG_STRING = 0x15; + private static final int MSG_ALARM = 0x16; + + private static void sendResponse(Channel channel, int type, int index) { + if (channel == null) { + ChannelBuffer response = ChannelBuffers.directBuffer(10); + response.writeByte(0x78); response.writeByte(0x78); // header + response.writeByte(0x05); // size + response.writeByte(type); + response.writeShort(index); + response.writeShort(Crc.crc16Ccitt(response.toByteBuffer(2, 4))); + response.writeByte(0x0D); response.writeByte(0x0A); // ending + channel.write(response); + } + } + + /** + * Decode message + */ + @Override + protected Object decode( + ChannelHandlerContext ctx, Channel channel, Object msg) + throws Exception { + + ChannelBuffer buf = (ChannelBuffer) msg; + + buf.skipBytes(2); // header + buf.readByte(); // size + + int type = buf.readUnsignedByte(); + + if (type == MSG_LOGIN) { + String imei = readImei(buf); + try { + deviceId = getDataManager().getDeviceByImei(imei).getId(); + sendResponse(channel, type, buf.readUnsignedShort()); + } catch(Exception error) { + Log.warning("Unknown device - " + imei); + } + } + + else if (type == MSG_HEARTBEAT) { + buf.skipBytes(5); + sendResponse(channel, type, buf.readUnsignedShort()); + } + + else if (type == MSG_DATA) { + // Create new position + Position position = new Position(); + position.setDeviceId(deviceId); + StringBuilder extendedInfo = new StringBuilder("<protocol>gt06</protocol>"); + + // Date and time + Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC")); + time.clear(); + time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte()); + time.set(Calendar.MONTH, buf.readUnsignedByte() - 1); + time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte()); + time.set(Calendar.HOUR, buf.readUnsignedByte()); + time.set(Calendar.MINUTE, buf.readUnsignedByte()); + time.set(Calendar.SECOND, buf.readUnsignedByte()); + position.setTime(time.getTime()); + + // Satellites count + extendedInfo.append("<satellites>"); + extendedInfo.append(buf.readUnsignedByte()); + extendedInfo.append("</satellites>"); + + // Latitude + double latitude = buf.readUnsignedInt() / (60.0 * 30000.0); + + // Longitude + double longitude = buf.readUnsignedInt() / (60.0 * 30000.0); + + // Speed + position.setSpeed((double) buf.readUnsignedByte()); + + // Course and flags + int union = buf.readUnsignedShort(); + position.setCourse((double) (union & 0x03FF)); + position.setValid((union & 0x1000) != 0); + if ((union & 0x0400) == 0) latitude = -latitude; + if ((union & 0x0800) == 0) longitude = -longitude; + + position.setLatitude(latitude); + position.setLongitude(longitude); + position.setAltitude(0.0); + + // Cell information + extendedInfo.append("<mcc>"); + extendedInfo.append(buf.readUnsignedShort()); + extendedInfo.append("</mcc>"); + extendedInfo.append("<mnc>"); + extendedInfo.append(buf.readUnsignedByte()); + extendedInfo.append("</mnc>"); + extendedInfo.append("<lac>"); + extendedInfo.append(buf.readUnsignedShort()); + extendedInfo.append("</lac>"); + extendedInfo.append("<cell>"); + extendedInfo.append(buf.readUnsignedShort() << 8 + buf.readUnsignedByte()); + extendedInfo.append("</cell>"); + + // Index + position.setId((long) buf.readUnsignedShort()); + + position.setExtendedInfo(extendedInfo.toString()); + return position; + } + + return null; + } + +} |