From 850734d2f1bef8aba5761f540caa40c23608acc6 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 6 Nov 2016 08:34:02 +1300
Subject: Fix NMEA checksum calculation (fix #2405)

---
 src/org/traccar/helper/Checksum.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src/org/traccar')

diff --git a/src/org/traccar/helper/Checksum.java b/src/org/traccar/helper/Checksum.java
index 629f6e7ca..f08292392 100644
--- a/src/org/traccar/helper/Checksum.java
+++ b/src/org/traccar/helper/Checksum.java
@@ -204,8 +204,9 @@ public final class Checksum {
 
     public static String nmea(String msg) {
         int checksum = 0;
-        for (byte b : msg.getBytes(StandardCharsets.US_ASCII)) {
-            checksum ^= b;
+        byte[] bytes = msg.getBytes(StandardCharsets.US_ASCII);
+        for (int i = 1; i < bytes.length; i++) {
+            checksum ^= bytes[i];
         }
         return String.format("*%02x", checksum).toUpperCase();
     }
-- 
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