1 files changed, 8 insertions, 0 deletions
diff --git a/src/org/traccar/helper/Checksum.java b/src/org/traccar/helper/Checksum.java
index 43ba6a689..44cef9635 100644
--- a/src/org/traccar/helper/Checksum.java
+++ b/src/org/traccar/helper/Checksum.java
@@ -243,4 +243,12 @@ public final class Checksum {
         return (10 - (checksum % 10)) % 10;
     }
 
+    public static int modulo256(byte[] bytes) {
+        int sum = 0;
+        for (byte b : bytes) {
+            sum = (sum + b) & 0xFF;
+        }
+        return sum;
+    }
+
 }