ESP32 native bootloader mode

src/modules/AdminModule.cpp

@@ -352,7 +352,7 @@ bool AdminModule::handleReceivedProtobuf(const meshtastic_MeshPacket &mp, meshta
     }
     case meshtastic_AdminMessage_enter_dfu_mode_request_tag: {
         LOG_INFO("Client requesting to enter DFU mode");
-#if defined(ARCH_NRF52) || defined(ARCH_RP2040)
+#if defined(ARCH_NRF52) || defined(ARCH_RP2040) || defined(ARDUINO_USB_CDC_ON_BOOT)
         enterDfuMode();
 #endif
         break;
@@ -1160,4 +1160,4 @@ void disableBluetooth()
         nrf52Bluetooth->shutdown();
 #endif
 #endif
-}
+}

src/platform/esp32/main-esp32.cpp

@@ -248,3 +248,12 @@ void cpuDeepSleep(uint32_t msecToWake)
     esp_sleep_enable_timer_wakeup(msecToWake * 1000ULL); // call expects usecs
     esp_deep_sleep_start();                              // TBD mA sleep current (battery)
 }
+
+void enterDfuMode()
+{
+#if defined(ARDUINO_USB_CDC_ON_BOOT)
+    // This is a no-op on the ESP32 normally, but on the ESP32-S3/C3 it will reboot to USB/JTAG mode
+    REG_WRITE(RTC_CNTL_OPTION1_REG, RTC_CNTL_FORCE_DOWNLOAD_BOOT);
+    esp_restart();
+#endif
+}