2 files changed, 7 insertions, 5 deletions
diff --git a/src/main/java/org/traccar/protocol/TeltonikaFrameDecoder.java b/src/main/java/org/traccar/protocol/TeltonikaFrameDecoder.java
index c30fee6e3..3a0962584 100644
--- a/src/main/java/org/traccar/protocol/TeltonikaFrameDecoder.java
+++ b/src/main/java/org/traccar/protocol/TeltonikaFrameDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 - 2019 Anton Tananaev (anton@traccar.org)
+ * Copyright 2013 - 2022 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.
@@ -30,7 +30,7 @@ public class TeltonikaFrameDecoder extends BaseFrameDecoder {
             ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
 
         while (buf.isReadable() && buf.getByte(buf.readerIndex()) == (byte) 0xff) {
-            buf.skipBytes(1);
+            return buf.readRetainedSlice(1);
         }
 
         if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) {
diff --git a/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java b/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
index c63d74c9c..929eca8aa 100644
--- a/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/TeltonikaProtocolDecoder.java
@@ -647,9 +647,11 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         }
     }
 
-    private Object decodeTcp(Channel channel, SocketAddress remoteAddress, ByteBuf buf) throws Exception {
+    private Object decodeTcp(Channel channel, SocketAddress remoteAddress, ByteBuf buf) {
 
-        if (buf.getUnsignedShort(0) > 0) {
+        if (buf.readableBytes() == 1 && buf.readUnsignedByte() == 0xff) {
+            return null;
+        } else if (buf.getUnsignedShort(0) > 0) {
             parseIdentification(channel, remoteAddress, buf);
         } else {
             buf.skipBytes(4);
@@ -659,7 +661,7 @@ public class TeltonikaProtocolDecoder extends BaseProtocolDecoder {
         return null;
     }
 
-    private Object decodeUdp(Channel channel, SocketAddress remoteAddress, ByteBuf buf) throws Exception {
+    private Object decodeUdp(Channel channel, SocketAddress remoteAddress, ByteBuf buf) {
 
         buf.readUnsignedShort(); // length
         buf.readUnsignedShort(); // packet id