From 585bec9e391a28b755b39ca46e4d3cc085b90312 Mon Sep 17 00:00:00 2001
From: Henry N <henrynmail-github@yahoo.de>
Date: Fri, 8 May 2020 22:11:26 +0200
Subject: [PATCH] amb8465: Print checksum errors from responses

---
 src/wmbus_amb8465.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/wmbus_amb8465.cc b/src/wmbus_amb8465.cc
index ca57710..0dffd2f 100644
--- a/src/wmbus_amb8465.cc
+++ b/src/wmbus_amb8465.cc
@@ -324,6 +324,12 @@ FrameStatus WMBusAmber::checkAMB8465Frame(vector<uchar> &data,
             *rssi = data[*frame_length-1];
         }
         debug("(amb8465) received full command frame\n");
+
+        uchar cs = xorChecksum(data, *frame_length-1);
+        if (data[*frame_length-1] != cs) {
+            verbose("(amb8465) checksum error %02x (should %02x)\n", data[*frame_length-1], cs);
+        }
+
         return FullFrame;
     }
     // If it is not a 0xff we assume it is a message beginning with a length.