From ea5d34b5102e75557668f85c6f3124ea5417a219 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Wed, 29 Dec 2021 20:55:49 -0800
Subject: Fix protocol response

---
 src/main/java/org/traccar/protocol/NavtelecomProtocolDecoder.java | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/main/java/org/traccar/protocol/NavtelecomProtocolDecoder.java b/src/main/java/org/traccar/protocol/NavtelecomProtocolDecoder.java
index bdcc12c4c..8314442a3 100644
--- a/src/main/java/org/traccar/protocol/NavtelecomProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/NavtelecomProtocolDecoder.java
@@ -235,12 +235,11 @@ public class NavtelecomProtocolDecoder extends BaseProtocolDecoder {
                     positions.add(position);
                 }
 
-                int checksum = buf.readUnsignedByte();
                 if (channel != null) {
                     ByteBuf response = Unpooled.buffer();
                     response.writeCharSequence(type, StandardCharsets.US_ASCII);
                     response.writeByte(count);
-                    response.writeByte(checksum);
+                    response.writeByte(Checksum.xor(response.nioBuffer()));
                     channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
                 }
 
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