From 6631d7c4b3522e81af563e3ac82131a6e5c50b89 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Thu, 20 Jul 2023 06:48:50 -0700
Subject: Improve RF-V48 frame decoding

---
 .../java/org/traccar/protocol/WatchFrameDecoder.java     | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

(limited to 'src/main/java/org')

diff --git a/src/main/java/org/traccar/protocol/WatchFrameDecoder.java b/src/main/java/org/traccar/protocol/WatchFrameDecoder.java
index ec67aa34d..9dfae8726 100644
--- a/src/main/java/org/traccar/protocol/WatchFrameDecoder.java
+++ b/src/main/java/org/traccar/protocol/WatchFrameDecoder.java
@@ -27,9 +27,21 @@ public class WatchFrameDecoder extends BaseFrameDecoder {
     protected Object decode(
             ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
 
+        int brackets = 0;
         int endIndex = -1;
-        for (int i = buf.writerIndex() - 1; i >= buf.readerIndex(); i--) {
-            if (buf.getByte(i) == ']') {
+        for (int i = buf.readerIndex(); i < buf.writerIndex(); i++) {
+            byte b = buf.getByte(i);
+            switch (b) {
+                case '[':
+                    brackets += 1;
+                    break;
+                case ']':
+                    brackets -= 1;
+                    break;
+                default:
+                    break;
+            }
+            if (brackets == 0 && i > buf.readerIndex()) {
                 endIndex = i + 1;
                 break;
             }
-- 
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