Portability from ESP8266, virtual Stream member functions. (#2701)

Author: dok-net

cores/esp32/Stream.h

@@ -97,8 +97,8 @@ class Stream: public Print
 
 floatparseFloat(); // float version of parseInt
 
-size_treadBytes(char *buffer, size_t length); // read chars from stream into buffer
-size_treadBytes(uint8_t *buffer, size_t length)
+virtualsize_treadBytes(char *buffer, size_t length); // read chars from stream into buffer
+virtualsize_treadBytes(uint8_t *buffer, size_t length)
  {
 returnreadBytes((char *) buffer, length);
  }
@@ -114,7 +114,7 @@ class Stream: public Print
 // returns the number of characters placed in the buffer (0 means no valid data found)
 
 // Arduino String functions to be added here
- String readString();
+virtualString readString();
  String readStringUntil(char terminator);
 
 protected: