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authorAnton Tananaev <anton.tananaev@gmail.com>2013-06-18 22:15:55 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2013-06-18 22:15:55 +1200
commit627aaff1b036a5a7b3dbc204726ba9f446beb1d3 (patch)
tree9df3e328f81d14cfd9291d546ada9ac367e2ae2e /src/org/traccar/protocol/AtrackProtocolDecoder.java
parent04cb08b983f2c408195c01e34ea4b6d3df5cda95 (diff)
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Start Atrack decoder
Diffstat (limited to 'src/org/traccar/protocol/AtrackProtocolDecoder.java')
-rw-r--r--src/org/traccar/protocol/AtrackProtocolDecoder.java130
1 files changed, 130 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/AtrackProtocolDecoder.java b/src/org/traccar/protocol/AtrackProtocolDecoder.java
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+/*
+ * Copyright 2013 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.BaseProtocolDecoder;
+import org.traccar.ServerManager;
+import org.traccar.helper.Log;
+import org.traccar.model.Position;
+
+public class AtrackProtocolDecoder extends BaseProtocolDecoder {
+
+ public AtrackProtocolDecoder(ServerManager serverManager) {
+ super(serverManager);
+ }
+
+ 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_HEARTBEAT = 0x1A;
+ private static final int MSG_DATA = 0x10;
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, Object msg)
+ throws Exception {
+
+ ChannelBuffer buf = (ChannelBuffer) msg;
+
+ buf.skipBytes(2); // prefix
+ buf.readUnsignedShort(); // checksum
+ buf.readUnsignedShort(); // length
+
+ // Zero for location messages
+ buf.readByte(); // voltage
+ buf.readByte(); // gsm signal
+
+ String imei = readImei(buf);
+ long index = buf.readUnsignedShort();
+ int type = buf.readUnsignedByte();
+
+ if (type == MSG_HEARTBEAT) {
+ if (channel != null) {
+ byte[] response = {0x54, 0x68, 0x1A, 0x0D, 0x0A};
+ channel.write(ChannelBuffers.wrappedBuffer(response));
+ }
+ }
+
+ else if (type == MSG_DATA) {
+
+ // Create new position
+ Position position = new Position();
+ position.setId(index);
+
+ // Get device id
+ try {
+ position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
+ } catch(Exception error) {
+ Log.warning("Unknown device - " + imei);
+ }
+
+ // 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());
+
+ // 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
+ position.setCourse((double) buf.readUnsignedShort());
+
+ buf.skipBytes(3); // reserved
+
+ // Flags
+ long flags = buf.readUnsignedInt();
+ position.setValid((flags & 0x1) == 0x1);
+ if ((flags & 0x2) == 0) latitude = -latitude;
+ if ((flags & 0x4) == 0) longitude = -longitude;
+
+ position.setLatitude(latitude);
+ position.setLongitude(longitude);
+ position.setAltitude(0.0);
+
+ return position;
+ }
+
+ return null;
+ }
+
+}