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Diffstat (limited to 'src/main/java/org/traccar/protocol/M2mProtocolDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/M2mProtocolDecoder.java127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/M2mProtocolDecoder.java b/src/main/java/org/traccar/protocol/M2mProtocolDecoder.java
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index 000000000..21e4a2fd0
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/M2mProtocolDecoder.java
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2013 - 2018 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 io.netty.buffer.ByteBuf;
+import io.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.Protocol;
+import org.traccar.helper.DateBuilder;
+import org.traccar.model.Position;
+
+import java.net.SocketAddress;
+
+public class M2mProtocolDecoder extends BaseProtocolDecoder {
+
+ public M2mProtocolDecoder(Protocol protocol) {
+ super(protocol);
+ }
+
+ private boolean firstPacket = true;
+
+ @Override
+ protected Object decode(
+ Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+ ByteBuf buf = (ByteBuf) msg;
+
+ // Remove offset
+ for (int i = 0; i < buf.readableBytes(); i++) {
+ int b = buf.getByte(i);
+ if (b != 0x0b) {
+ buf.setByte(i, b - 0x20);
+ }
+ }
+
+ if (firstPacket) {
+
+ firstPacket = false;
+
+ StringBuilder imei = new StringBuilder();
+ for (int i = 0; i < 8; i++) {
+ int b = buf.readByte();
+ if (i != 0) {
+ imei.append(b / 10);
+ }
+ imei.append(b % 10);
+ }
+
+ getDeviceSession(channel, remoteAddress, imei.toString());
+
+ } else {
+
+ DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+ if (deviceSession == null) {
+ return null;
+ }
+
+ Position position = new Position(getProtocolName());
+ position.setDeviceId(deviceSession.getDeviceId());
+
+ DateBuilder dateBuilder = new DateBuilder()
+ .setDay(buf.readUnsignedByte() & 0x3f)
+ .setMonth(buf.readUnsignedByte() & 0x3f)
+ .setYear(buf.readUnsignedByte())
+ .setHour(buf.readUnsignedByte() & 0x3f)
+ .setMinute(buf.readUnsignedByte() & 0x7f)
+ .setSecond(buf.readUnsignedByte() & 0x7f);
+ position.setTime(dateBuilder.getDate());
+
+ int degrees = buf.readUnsignedByte();
+ double latitude = buf.readUnsignedByte();
+ latitude += buf.readUnsignedByte() / 100.0;
+ latitude += buf.readUnsignedByte() / 10000.0;
+ latitude /= 60;
+ latitude += degrees;
+
+ int b = buf.readUnsignedByte();
+
+ degrees = (b & 0x7f) * 100 + buf.readUnsignedByte();
+ double longitude = buf.readUnsignedByte();
+ longitude += buf.readUnsignedByte() / 100.0;
+ longitude += buf.readUnsignedByte() / 10000.0;
+ longitude /= 60;
+ longitude += degrees;
+
+ if ((b & 0x80) != 0) {
+ longitude = -longitude;
+ }
+ if ((b & 0x40) != 0) {
+ latitude = -latitude;
+ }
+
+ position.setValid(true);
+ position.setLatitude(latitude);
+ position.setLongitude(longitude);
+ position.setSpeed(buf.readUnsignedByte());
+
+ int satellites = buf.readUnsignedByte();
+ if (satellites == 0) {
+ return null; // cell information
+ }
+ position.set(Position.KEY_SATELLITES, satellites);
+
+ // decode other data
+
+ return position;
+
+ }
+
+ return null;
+ }
+
+}