From f010c8e2e8bb4fd75cf58115281474dda449e6b6 Mon Sep 17 00:00:00 2001
From: Ryan Mulder <ryan.mulder@antrum.com>
Date: Sat, 5 Jul 2025 23:01:47 -0400
Subject: [PATCH] add a debug print when tsm retries (#1040)

---
 src/bacnet/basic/tsm/tsm.c      | 5 +++++
 test/bacnet/npdu/CMakeLists.txt | 1 +
 2 files changed, 6 insertions(+)

diff --git a/src/bacnet/basic/tsm/tsm.c b/src/bacnet/basic/tsm/tsm.c
index 8deba72a..707ec53a 100644
--- a/src/bacnet/basic/tsm/tsm.c
+++ b/src/bacnet/basic/tsm/tsm.c
@@ -16,6 +16,7 @@
 #include "bacnet/bacaddr.h"
 #include "bacnet/bacdcode.h"
 #include "bacnet/basic/tsm/tsm.h"
+#include "bacnet/basic/sys/debug.h"
 #include "bacnet/datalink/datalink.h"
 #include "bacnet/basic/services.h"
 #include "bacnet/basic/binding/address.h"
@@ -316,6 +317,10 @@ void tsm_timer_milliseconds(uint16_t milliseconds)
                     datalink_send_pdu(
                         &plist->dest, &plist->npdu_data, &plist->apdu[0],
                         plist->apdu_len);
+                    DEBUG_PRINTF(
+                        "invoke-id[%u] Retry %u of %u after %ums\n",
+                        plist->InvokeID, plist->RetryCount, apdu_retries(),
+                        plist->RequestTimer);
                 } else {
                     /* note: the invoke id has not been cleared yet
                        and this indicates a failed message:
diff --git a/test/bacnet/npdu/CMakeLists.txt b/test/bacnet/npdu/CMakeLists.txt
index 94af1402..c393109d 100644
--- a/test/bacnet/npdu/CMakeLists.txt
+++ b/test/bacnet/npdu/CMakeLists.txt
@@ -43,6 +43,7 @@ add_executable(${PROJECT_NAME}
     ${SRC_DIR}/bacnet/bacstr.c
     ${SRC_DIR}/bacnet/basic/service/h_apdu.c
     ${SRC_DIR}/bacnet/basic/sys/bigend.c
+    ${SRC_DIR}/bacnet/basic/sys/debug.c
     ${SRC_DIR}/bacnet/basic/tsm/tsm.c
     ${SRC_DIR}/bacnet/dcc.c
     ./stubs.c