From f50278307657847f488c09c359b7512fb172e3cf Mon Sep 17 00:00:00 2001
From: netscout2001 <4687675+netscout2001@users.noreply.github.com>
Date: Thu, 19 Mar 2026 15:56:09 +0100
Subject: [PATCH] fix: increase WiFi shutdown delay before restart to fix MQTT
 reconnect after OTA

---
 src/main.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 3e74529b..a6ed223f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -154,10 +154,9 @@ void loop()
         LOGI("OTA", "restarting now (main loop)");
         esp_wifi_stop();
         lvgl_port_prepare_restart();
-        delay(50);
-        // Delegate restart to a dedicated Core 0 task so Core 0 is the initiator.
-        // This avoids using the small IPC task stack and reduces restart races.
-        // This eliminates the RUNSTALL timing race that caused "Cache disabled" panics.
+        delay(250);  // increased from 50ms — gives WiFi/TCP stack time to
+                     // fully shut down so the MQTT broker cleanly closes the
+                     // old session before the device reconnects after reboot
         safe_restart_via_core0();
     }