1 files changed, 147 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/Avl301ProtocolDecoder.java b/src/org/traccar/protocol/Avl301ProtocolDecoder.java
new file mode 100644
index 000000000..4bc7686e7
--- /dev/null
+++ b/src/org/traccar/protocol/Avl301ProtocolDecoder.java
@@ -0,0 +1,147 @@
+/*
+ * 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 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.model.ExtendedInfoFormatter;
+import org.traccar.model.Position;
+
+import java.util.Calendar;
+import java.util.TimeZone;
+
+public class Avl301ProtocolDecoder extends BaseProtocolDecoder {
+
+    public Avl301ProtocolDecoder(String protocol) {
+        super(protocol);
+    }
+
+    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 = 'L';
+    private static final int MSG_STATUS = 'H';
+    private static final int MSG_GPS_LBS_STATUS = '$';
+
+    private static void sendResponse(Channel channel, int type) {
+        if (channel != null) {
+            ChannelBuffer response = ChannelBuffers.directBuffer(5);
+            response.writeByte('$');
+            response.writeByte(type);
+            response.writeByte('#');
+            response.writeByte('\r'); response.writeByte('\n');
+            channel.write(response);
+        }
+    }
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, Object msg)
+            throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        buf.skipBytes(1); // header
+        int type = buf.readUnsignedByte();
+        buf.readUnsignedByte(); // length
+
+        if (type == MSG_LOGIN) {
+
+            if (identify(readImei(buf))) {
+                sendResponse(channel, type);
+            }
+
+        } else if (hasDeviceId() && type == MSG_STATUS) {
+
+            sendResponse(channel, type);
+
+        } else if (hasDeviceId() && type == MSG_GPS_LBS_STATUS) {
+
+            // Create new position
+            Position position = new Position();
+            position.setDeviceId(getDeviceId());
+            ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter(getProtocol());
+
+            // Date and time(6)
+            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_OF_DAY, buf.readUnsignedByte());
+            time.set(Calendar.MINUTE, buf.readUnsignedByte());
+            time.set(Calendar.SECOND, buf.readUnsignedByte());
+            position.setTime(time.getTime());
+
+            // GPS length and Satellites count
+            int gpsLength = buf.readUnsignedByte();
+            extendedInfo.set("satellites", gpsLength & 0xf);
+            gpsLength >>= 4;
+
+            //Skip Satellite numbers
+            buf.skipBytes(1);
+
+            // Location
+            double latitude = buf.readUnsignedInt() / 600000.0;
+            double longitude = buf.readUnsignedInt() / 600000.0;
+            position.setSpeed(buf.readUnsignedByte() * 1.0); // kph?
+
+            // 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);
+
+            if ((union & 0x4000) != 0) {
+                extendedInfo.set("acc", (union & 0x8000) != 0);
+            }
+
+            extendedInfo.set("lac", buf.readUnsignedShort());
+            extendedInfo.set("cell", buf.readUnsignedMedium());
+            extendedInfo.set("alarm", true);
+            int flags = buf.readUnsignedByte();
+            extendedInfo.set("acc", (flags & 0x2) != 0);
+
+            // TODO parse other flags
+
+            extendedInfo.set("power", buf.readUnsignedByte());
+            extendedInfo.set("gsm", buf.readUnsignedByte());
+
+            position.setExtendedInfo(extendedInfo.toString());
+            return position;
+        }
+
+        return null;
+    }
+
+}