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Diffstat (limited to 'src/main/java/org/traccar/protocol/AlematicsFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/AlematicsFrameDecoder.java50
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diff --git a/src/main/java/org/traccar/protocol/AlematicsFrameDecoder.java b/src/main/java/org/traccar/protocol/AlematicsFrameDecoder.java
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+++ b/src/main/java/org/traccar/protocol/AlematicsFrameDecoder.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2017 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.ChannelHandlerContext;
+import io.netty.handler.codec.LineBasedFrameDecoder;
+import org.traccar.NetworkMessage;
+
+public class AlematicsFrameDecoder extends LineBasedFrameDecoder {
+
+ private static final int MESSAGE_MINIMUM_LENGTH = 2;
+
+ public AlematicsFrameDecoder(int maxFrameLength) {
+ super(maxFrameLength);
+ }
+
+ // example of heartbeat: FA F8 00 07 00 03 15 AD 4E 78 3A D2
+
+ @Override
+ protected Object decode(ChannelHandlerContext ctx, ByteBuf buf) throws Exception {
+
+ if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) {
+ return null;
+ }
+
+ if (buf.getUnsignedShort(buf.readerIndex()) == 0xFAF8) {
+ ByteBuf heartbeat = buf.readRetainedSlice(12);
+ if (ctx != null && ctx.channel() != null) {
+ ctx.channel().writeAndFlush(new NetworkMessage(heartbeat, ctx.channel().remoteAddress()));
+ }
+ }
+
+ return super.decode(ctx, buf);
+ }
+
+}