diff --git a/src/SerialFake.cpp b/src/SerialFake.cpp
index 8e27a3d..e4032c4 100644
--- a/src/SerialFake.cpp
+++ b/src/SerialFake.cpp
@@ -83,6 +83,10 @@ bool Serial_::rts()
     return ArduinoFakeInstance(Serial, this)->rts();
 }
 
+void Serial_::setDebugOutput(bool _value){
+    return ArduinoFakeInstance(Serial, this) -> setDebugOutput(_value);
+}
+
 int32_t Serial_::readBreak()
 {
     return ArduinoFakeInstance(Serial, this)->readBreak();
diff --git a/src/SerialFake.h b/src/SerialFake.h
index 962148a..ee25ba0 100644
--- a/src/SerialFake.h
+++ b/src/SerialFake.h
@@ -28,6 +28,8 @@ struct SerialFake : public StreamFake
     virtual uint8_t numbits() = 0;
     virtual bool dtr() = 0;
     virtual bool rts() = 0;
+
+    virtual void setDebugOutput(bool);
 };
 
 class SerialFakeProxy : public StreamFakeProxy, public Serial_
diff --git a/src/arduino/IPAddress.cpp b/src/arduino/IPAddress.cpp
index f95e524..aaca797 100644
--- a/src/arduino/IPAddress.cpp
+++ b/src/arduino/IPAddress.cpp
@@ -112,3 +112,10 @@ size_t IPAddress::printTo(Print& p) const
     return n;
 }
 
+String IPAddress::toString() const
+{
+    char szRet[16];
+    sprintf(szRet,"%u.%u.%u.%u", _address.bytes[0], _address.bytes[1], _address.bytes[2], _address.bytes[3]);
+    return String(szRet);
+}
+
diff --git a/src/arduino/IPAddress.h b/src/arduino/IPAddress.h
index d762f2c..036100f 100644
--- a/src/arduino/IPAddress.h
+++ b/src/arduino/IPAddress.h
@@ -64,6 +64,7 @@ class IPAddress : public Printable {
     IPAddress& operator=(uint32_t address);
 
     virtual size_t printTo(Print& p) const;
+    String toString() const;
 
     friend class EthernetClass;
     friend class UDP;
diff --git a/src/arduino/USBAPI.h b/src/arduino/USBAPI.h
index 89fc4c8..5a544b4 100644
--- a/src/arduino/USBAPI.h
+++ b/src/arduino/USBAPI.h
@@ -105,6 +105,8 @@ class Serial_ : public Stream
 	volatile uint8_t _rx_buffer_tail;
 	unsigned char _rx_buffer[SERIAL_BUFFER_SIZE];
 
+	virtual void setDebugOutput(bool);
+
 	// This method allows processing "SEND_BREAK" requests sent by
 	// the USB host. Those requests indicate that the host wants to
 	// send a BREAK signal and are accompanied by a single uint16_t
diff --git a/test/test_serial.h b/test/test_serial.h
index cc820b4..e3f03d0 100644
--- a/test/test_serial.h
+++ b/test/test_serial.h
@@ -65,6 +65,7 @@ namespace SerialTest
 
         Serial.flush();
         Serial.end();
+        Serial.setDebugOutput(true);
 
         Verify(OverloadedMethod(ArduinoFake(Serial), begin, void(unsigned long)).Using(9600)).Once();
         Verify(Method(ArduinoFake(Serial), available)).Exactly(2_Times);
@@ -73,6 +74,8 @@ namespace SerialTest
 
         Verify(Method(ArduinoFake(Serial), flush)).Once();
         Verify(Method(ArduinoFake(Serial), end)).Once();
+
+        Verify(Method(ArduinoFake(Serial), setDebugOutput)).Once();
     }
 
     void run_tests()