From 6a6adc4f33d38ee964494d01100eaa127adbf356 Mon Sep 17 00:00:00 2001 From: Anton Tananaev Date: Wed, 1 May 2013 23:38:28 +1200 Subject: Support intellitrac sync message (fix #227) --- .../traccar/protocol/IntellitracFrameDecoder.java | 58 ++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 src/org/traccar/protocol/IntellitracFrameDecoder.java (limited to 'src/org/traccar/protocol') diff --git a/src/org/traccar/protocol/IntellitracFrameDecoder.java b/src/org/traccar/protocol/IntellitracFrameDecoder.java new file mode 100644 index 000000000..461186310 --- /dev/null +++ b/src/org/traccar/protocol/IntellitracFrameDecoder.java @@ -0,0 +1,58 @@ +/* + * 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 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.jboss.netty.handler.codec.frame.DelimiterBasedFrameDecoder; + +public class IntellitracFrameDecoder extends DelimiterBasedFrameDecoder { + + private static final int MESSAGE_MINIMUM_LENGTH = 0; + + private static final byte delimiter[] = { (byte) '\r', (byte) '\n' }; + + public IntellitracFrameDecoder(int maxFrameLength) { + super(maxFrameLength, ChannelBuffers.wrappedBuffer(delimiter)); + } + + // example of sync header: 0xFA 0xF8 0x1B 0x01 0x81 0x60 0x33 0x3C + + @Override + protected Object decode( + ChannelHandlerContext ctx, + Channel channel, + ChannelBuffer buf) throws Exception { + + // Check minimum length + if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) { + return null; + } + + // Check for sync packet + if (buf.getUnsignedShort(buf.readerIndex()) == 0xFAF8) { + ChannelBuffer syncMessage = buf.readBytes(8); + if (channel != null) { + channel.write(syncMessage); + } + } + + return super.decode(ctx, channel, buf); + } + +} -- cgit v1.2.3