--- a/cores/arduino/PluggableUSB.h	2019-05-16 15:52:01.000000000 +0300
+++ b/cores/arduino/PluggableUSB.h	2020-11-14 20:57:30.942432544 +0300
@@ -31,6 +31,8 @@
     numEndpoints(numEps), numInterfaces(numIfs), endpointType(epType)
   { }

+  uint8_t getPluggedEndpoint() { return pluggedEndpoint; }
+
 protected:
   virtual bool setup(USBSetup& setup) = 0;
   virtual int getInterface(uint8_t* interfaceCount) = 0;