From cded92662f390e4281e4f1d58cfe35cede90f64b Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Thu, 16 Mar 2023 13:08:34 +0100
Subject: [PATCH] workaround for issue #3128

---
 wled00/wled.cpp        | 3 +++
 wled00/wled.h          | 2 +-
 wled00/wled_serial.cpp | 1 +
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/wled00/wled.cpp b/wled00/wled.cpp
index dcb944836..f46483beb 100644
--- a/wled00/wled.cpp
+++ b/wled00/wled.cpp
@@ -267,6 +267,9 @@ void WLED::setup()
   WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); //disable brownout detection
   #endif
 
+  #ifdef ARDUINO_ARCH_ESP32
+  pinMode(hardwareRX, INPUT_PULLDOWN); delay(1);        // suppress noise in case RX pin is floating (at low noise energy) - see issue #3128
+  #endif
   Serial.begin(115200);
   #if !ARDUINO_USB_CDC_ON_BOOT
   Serial.setTimeout(50);  // this causes troubles on new MCUs that have a "virtual" USB Serial (HWCDC)
diff --git a/wled00/wled.h b/wled00/wled.h
index ffb547eae..b51a85402 100644
--- a/wled00/wled.h
+++ b/wled00/wled.h
@@ -8,7 +8,7 @@
  */
 
 // version code in format yymmddb (b = daily build)
-#define VERSION 2303050
+#define VERSION 2303160
 
 //uncomment this if you have a "my_config.h" file you'd like to use
 //#define WLED_USE_MY_CONFIG
diff --git a/wled00/wled_serial.cpp b/wled00/wled_serial.cpp
index 3e416b951..4d920e340 100644
--- a/wled00/wled_serial.cpp
+++ b/wled00/wled_serial.cpp
@@ -70,6 +70,7 @@ void sendBytes(){
 void handleSerial()
 {
   if (pinManager.isPinAllocated(hardwareRX)) return;
+  if (!Serial) return;              // arduino docs: `if (Serial)` indicates whether or not the USB CDC serial connection is open. For all non-USB CDC ports, this will always return true
 
   #ifdef WLED_ENABLE_ADALIGHT
   static auto state = AdaState::Header_A;