2 files changed, 13 insertions, 2 deletions
diff --git a/src/main/java/org/traccar/protocol/WatchFrameDecoder.java b/src/main/java/org/traccar/protocol/WatchFrameDecoder.java
index f99bd52e2..ec67aa34d 100644
--- a/src/main/java/org/traccar/protocol/WatchFrameDecoder.java
+++ b/src/main/java/org/traccar/protocol/WatchFrameDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2017 - 2018 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 - 2023 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.
@@ -27,7 +27,14 @@ public class WatchFrameDecoder extends BaseFrameDecoder {
     protected Object decode(
             ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
 
-        int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) ']') + 1;
+        int endIndex = -1;
+        for (int i = buf.writerIndex() - 1; i >= buf.readerIndex(); i--) {
+            if (buf.getByte(i) == ']') {
+                endIndex = i + 1;
+                break;
+            }
+        }
+
         if (endIndex > 0) {
             ByteBuf frame = Unpooled.buffer();
             while (buf.readerIndex() < endIndex) {
diff --git a/src/test/java/org/traccar/protocol/WatchFrameDecoderTest.java b/src/test/java/org/traccar/protocol/WatchFrameDecoderTest.java
index 8b0486322..bf212544c 100644
--- a/src/test/java/org/traccar/protocol/WatchFrameDecoderTest.java
+++ b/src/test/java/org/traccar/protocol/WatchFrameDecoderTest.java
@@ -11,6 +11,10 @@ public class WatchFrameDecoderTest extends ProtocolTest {
         var decoder = inject(new WatchFrameDecoder());
 
         verifyFrame(
+                binary("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"),
+                decoder.decode(null, null, binary("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")));
+
+        verifyFrame(
                 binary("5b33472a3335323636313039303134333135302a303030412a4c4b2c302c302c3130305d"),
                 decoder.decode(null, null, binary("5b33472a3335323636313039303134333135302a303030412a4c4b2c302c302c3130305d")));