Fixed compile errors for STM32 boards

src/WiFiEspClient.cpp

@@ -43,14 +43,14 @@ WiFiEspClient::WiFiEspClient(uint8_t sock) : _sock(sock)
 // this is very slow on ESP
 size_t WiFiEspClient::print(const __FlashStringHelper *ifsh)
 {
-	printFSH(ifsh, false);
+	return printFSH(ifsh, false);
 }
 
 // if we do override this, the standard println will call the print
 // method twice
 size_t WiFiEspClient::println(const __FlashStringHelper *ifsh)
 {
-	printFSH(ifsh, true);
+	return printFSH(ifsh, true);
 }
 
 

src/utility/EspDrv.cpp

@@ -22,6 +22,13 @@ along with The Arduino WiFiEsp library.  If not, see
 #include "utility/EspDrv.h"
 #include "utility/debug.h"
 
+#if defined(ARDUINO_ARCH_STM32)
+//For va_start
+#include <stdarg.h>
+
+//vsnprintf_P is not defined in avr/pgmspace.h for ststm32-maple
+#define vsnprintf_P vsnprintf
+#endif
 
 #define NUMESPTAGS 5
 

src/utility/RingBuffer.cpp

@@ -92,7 +92,7 @@ void RingBuffer::getStr(char * destination, unsigned int skipChars)
 
 void RingBuffer::getStrN(char * destination, unsigned int skipChars, unsigned int num)
 {
-	int len = ringBufP-ringBuf-skipChars;
+	unsigned int len = ringBufP-ringBuf-skipChars;
 
 	if (len>num)
 		len=num;