diff --git a/app/src/main/java/com/shuwei/intelligent/shelves/HomeActivity.kt b/app/src/main/java/com/shuwei/intelligent/shelves/HomeActivity.kt
index c3c5772..60ea534 100644
--- a/app/src/main/java/com/shuwei/intelligent/shelves/HomeActivity.kt
+++ b/app/src/main/java/com/shuwei/intelligent/shelves/HomeActivity.kt
@@ -184,7 +184,7 @@ class HomeActivity : BaseActivity() {
         var data = ""
         if (srcData.startsWith(HEADER) && srcData.contains(FOOTER)) {
             serialReader.clear()
-            val endIndex = srcData.indexOf(FOOTER)
+            val endIndex = srcData.indexOf(FOOTER) + FOOTER.length
             serialReader.append(srcData.substring(0, endIndex))
             data = serialReader.toString()
         } else if (srcData.startsWith(HEADER) && srcData.contains(FOOTER).not()) {