From 1795b5b439ab2d13175b702aba487c9f8ee4d72d Mon Sep 17 00:00:00 2001
From: Theo Arends <11044339+arendst@users.noreply.github.com>
Date: Mon, 29 Dec 2025 16:46:14 +0100
Subject: [PATCH] Fix GDK101 power on detection (#24242)

---
 CHANGELOG.md                                    | 1 +
 RELEASENOTES.md                                 | 1 +
 tasmota/tasmota_xsns_sensor/xsns_106_gdk101.ino | 9 +++++----
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a043a7870..6fbc12f5f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ All notable changes to this project will be documented in this file.
 
 ### Fixed
 - ESP32 BLE not starting (#24240)
+- GDK101 power on detection (#24242)
 
 ### Removed
 
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 4520a4658..fd7f31aab 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -126,6 +126,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
 ### Fixed
 - ESP8266 TasmotaSerial flush receive buffer on executing `TasmotaSerial.flush();`
 - ESP32-P4 unique MQTT Client based on hosted MCU MAC address
+- GDK101 power on detection [#24242](https://github.com/arendst/Tasmota/issues/24242)
 - DALI watchdog exception
 - TuyaMCU v1 exception 28 regression from v15.1.0.1 reverted PR24063 [#24220](https://github.com/arendst/Tasmota/issues/24220)
 - ESP32 BLE not starting [#24240](https://github.com/arendst/Tasmota/issues/24240)
diff --git a/tasmota/tasmota_xsns_sensor/xsns_106_gdk101.ino b/tasmota/tasmota_xsns_sensor/xsns_106_gdk101.ino
index cdccf5ce8..19c260021 100644
--- a/tasmota/tasmota_xsns_sensor/xsns_106_gdk101.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_106_gdk101.ino
@@ -256,10 +256,11 @@ bool Xsns106(uint32_t function) {
 
   bool result = false;
 
-  if (FUNC_INIT == function) {
-    Gdk101Detect();
-  }
-  else if (Gdk.ready) {
+  if (!Gdk.ready) {
+    if ((TasmotaGlobal.uptime < 20) && (FUNC_EVERY_SECOND == function)) {
+      Gdk101Detect();  // GDK101 power on ready can take 8 seconds so try every second for up to 20 seconds
+    }
+  } else {
     switch (function) {
       case FUNC_EVERY_SECOND:
         Gdk101EverySecond();