From ad533e642fc6821a2597758419fd2e180597d39b Mon Sep 17 00:00:00 2001
From: mikecarper <mikecarper@gmail.com>
Date: Tue, 4 Aug 2026 01:16:18 -0700
Subject: [PATCH] Fix ESP32 KISS serial guard

---
 examples/kiss_modem/main.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/kiss_modem/main.cpp b/examples/kiss_modem/main.cpp
index 89764787f..aab5badc3 100644
--- a/examples/kiss_modem/main.cpp
+++ b/examples/kiss_modem/main.cpp
@@ -120,7 +120,7 @@ void setup() {
   uint32_t start = millis();
   while (!Serial && millis() - start < 3000) delay(10);
   delay(100);
-#if defined(ESP32) && ARDUINO_USB_MODE
+#if defined(ESP32) && ARDUINO_USB_MODE && ARDUINO_USB_CDC_ON_BOOT
   Serial.setTxTimeoutMs(USB_TX_TIMEOUT_MS);
   Serial.setTxBufferSize(USB_TX_BUFFER_SIZE);
 #endif