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authorAnton Tananaev <anton.tananaev@gmail.com>2021-10-31 15:44:55 -0700
committerAnton Tananaev <anton.tananaev@gmail.com>2021-10-31 15:44:55 -0700
commitfb60f434eccef5e4d0f9e3e9eca75ca73d01d2bd (patch)
tree26718fda05c3745452d5a12257cbba4be8e01694 /src/main/java/org/traccar/protocol/DualcamFrameDecoder.java
parentde44291fc5f23703176d8c6b872420319357fd84 (diff)
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Support Teltonika Dualcam protocol
Diffstat (limited to 'src/main/java/org/traccar/protocol/DualcamFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/DualcamFrameDecoder.java49
1 files changed, 49 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/DualcamFrameDecoder.java b/src/main/java/org/traccar/protocol/DualcamFrameDecoder.java
new file mode 100644
index 000000000..312d43f19
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/DualcamFrameDecoder.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2021 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 io.netty.channel.ChannelHandlerContext;
+import org.traccar.BaseFrameDecoder;
+
+public class DualcamFrameDecoder extends BaseFrameDecoder {
+
+ private static final int MESSAGE_MINIMUM_LENGTH = 4;
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) {
+ return null;
+ }
+
+ int length;
+ if (buf.getUnsignedShort(buf.readerIndex()) == 0) {
+ length = 16;
+ } else {
+ length = 4 + buf.getUnsignedShort(buf.readerIndex() + 2);
+ }
+
+ if (buf.readableBytes() >= length) {
+ return buf.readRetainedSlice(length);
+ }
+
+ return null;
+ }
+
+}