From f3ee76d3b011c1bab9669603220e921a0cdbe701 Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Wed, 25 Feb 2026 21:55:31 +0800
Subject: [PATCH] fix: add missing stdlib.h include in heartbeat.c

The code calls free() without including <stdlib.h>, which triggers
implicit declaration warnings during the build.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
---
 main/heartbeat/heartbeat.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/main/heartbeat/heartbeat.c b/main/heartbeat/heartbeat.c
index e680201..b5931db 100644
--- a/main/heartbeat/heartbeat.c
+++ b/main/heartbeat/heartbeat.c
@@ -3,6 +3,7 @@
 #include "bus/message_bus.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
 #include <ctype.h>