From a743ee12f80d03ada3a35dbacadd9bf8e338211e Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Sun, 10 Mar 2024 16:42:12 +0100
Subject: [PATCH] Ingore last three bytes of truma_message_header #25.

---
 components/truma_inetbox/TrumaiNetBoxApp.cpp | 2 +-
 components/truma_inetbox/helpers.h           | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/components/truma_inetbox/TrumaiNetBoxApp.cpp b/components/truma_inetbox/TrumaiNetBoxApp.cpp
index cb59c9f..b2fad32 100644
--- a/components/truma_inetbox/TrumaiNetBoxApp.cpp
+++ b/components/truma_inetbox/TrumaiNetBoxApp.cpp
@@ -132,7 +132,7 @@ const u_int8_t *TrumaiNetBoxApp::lin_multiframe_recieved(const u_int8_t *message
   if (message_len < truma_message_header.size()) {
     return nullptr;
   }
-  for (u_int8_t i = 1; i < truma_message_header.size(); i++) {
+  for (u_int8_t i = 1; i < truma_message_header.size() - 3; i++) {
     if (message[i] != truma_message_header[i]) {
       return nullptr;
     }
diff --git a/components/truma_inetbox/helpers.h b/components/truma_inetbox/helpers.h
index 89e0885..35ccaba 100644
--- a/components/truma_inetbox/helpers.h
+++ b/components/truma_inetbox/helpers.h
@@ -5,7 +5,7 @@
 
 namespace esphome {
 namespace truma_inetbox {
-// First byte is service identifier and to be ignored.
+// First byte is service identifier and to be ignored. Last three bytes can be `xFF` or `x00` (see <https://github.com/Fabian-Schmidt/esphome-truma_inetbox/issues/25>).
 const std::array<u_int8_t, 11> truma_message_header = {0x00, 0x00, 0x1F, 0x00, 0x1E, 0x00,
                                                        0x00, 0x22, 0xFF, 0xFF, 0xFF};