From 4f22960a90408ebce1f4a38530a290818172ceab Mon Sep 17 00:00:00 2001
From: Max Prokhorov <prokhorov.max@outlook.com>
Date: Tue, 25 Apr 2023 02:55:40 +0300
Subject: [PATCH] mqtt: missing buffer offset

re-apply fix from #2181
resolve #2586
---
 code/espurna/mqtt.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/espurna/mqtt.cpp b/code/espurna/mqtt.cpp
index 36592bdd..356c7220 100644
--- a/code/espurna/mqtt.cpp
+++ b/code/espurna/mqtt.cpp
@@ -1229,7 +1229,7 @@ void _mqttOnMessageAsync(char* topic, char* payload, AsyncMqttClientMessagePrope
     }
 
     alignas(4) static char buffer[((BufferSize + 3) & ~3) + 4] = {0};
-    std::copy(payload, payload + len, buffer);
+    std::copy(payload, payload + len, &buffer[index]);
 
     // Not done yet
     if (total != (len + index)) {