diff --git a/STM32F1/cores/maple/Client.h b/STM32F1/cores/maple/Client.h
new file mode 100644
index 0000000..b8e5d93
--- /dev/null
+++ b/STM32F1/cores/maple/Client.h
@@ -0,0 +1,45 @@
+/*
+  Client.h - Base class that provides Client
+  Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef client_h
+#define client_h
+#include "Print.h"
+#include "Stream.h"
+#include "IPAddress.h"
+
+class Client : public Stream {
+
+public:
+  virtual int connect(IPAddress ip, uint16_t port) =0;
+  virtual int connect(const char *host, uint16_t port) =0;
+  virtual size_t write(uint8_t) =0;
+  virtual size_t write(const uint8_t *buf, size_t size) =0;
+  virtual int available() = 0;
+  virtual int read() = 0;
+  virtual int read(uint8_t *buf, size_t size) = 0;
+  virtual int peek() = 0;
+  virtual void flush() = 0;
+  virtual void stop() = 0;
+  virtual uint8_t connected() = 0;
+  virtual operator bool() = 0;
+protected:
+  uint8_t* rawIPAddress(IPAddress& addr) { return addr.raw_address(); };
+};
+
+#endif
diff --git a/STM32F1/cores/maple/IPAddress.cpp b/STM32F1/cores/maple/IPAddress.cpp
new file mode 100644
index 0000000..899cbd4
--- /dev/null
+++ b/STM32F1/cores/maple/IPAddress.cpp
@@ -0,0 +1,74 @@
+/*
+  IPAddress.cpp - Base class that provides IPAddress
+  Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <Arduino.h>
+#include <IPAddress.h>
+
+IPAddress::IPAddress()
+{
+    _address.dword = 0;
+}
+
+IPAddress::IPAddress(uint8_t first_octet, uint8_t second_octet, uint8_t third_octet, uint8_t fourth_octet)
+{
+    _address.bytes[0] = first_octet;
+    _address.bytes[1] = second_octet;
+    _address.bytes[2] = third_octet;
+    _address.bytes[3] = fourth_octet;
+}
+
+IPAddress::IPAddress(uint32_t address)
+{
+    _address.dword = address;
+}
+
+IPAddress::IPAddress(const uint8_t *address)
+{
+    memcpy(_address.bytes, address, sizeof(_address.bytes));
+}
+
+IPAddress& IPAddress::operator=(const uint8_t *address)
+{
+    memcpy(_address.bytes, address, sizeof(_address.bytes));
+    return *this;
+}
+
+IPAddress& IPAddress::operator=(uint32_t address)
+{
+    _address.dword = address;
+    return *this;
+}
+
+bool IPAddress::operator==(const uint8_t* addr) const
+{
+    return memcmp(addr, _address.bytes, sizeof(_address.bytes)) == 0;
+}
+
+size_t IPAddress::printTo(Print& p) const
+{
+    size_t n = 0;
+    for (int i =0; i < 3; i++)
+    {
+        n += p.print(_address.bytes[i], DEC);
+        n += p.print('.');
+    }
+    n += p.print(_address.bytes[3], DEC);
+    return n;
+}
+
diff --git a/STM32F1/cores/maple/IPAddress.h b/STM32F1/cores/maple/IPAddress.h
new file mode 100644
index 0000000..94acdc4
--- /dev/null
+++ b/STM32F1/cores/maple/IPAddress.h
@@ -0,0 +1,75 @@
+/*
+  IPAddress.h - Base class that provides IPAddress
+  Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef IPAddress_h
+#define IPAddress_h
+
+#include <stdint.h>
+#include <Printable.h>
+
+// A class to make it easier to handle and pass around IP addresses
+
+class IPAddress : public Printable {
+private:
+    union {
+	uint8_t bytes[4];  // IPv4 address
+	uint32_t dword;
+    } _address;
+
+    // Access the raw byte array containing the address.  Because this returns a pointer
+    // to the internal structure rather than a copy of the address this function should only
+    // be used when you know that the usage of the returned uint8_t* will be transient and not
+    // stored.
+    uint8_t* raw_address() { return _address.bytes; };
+
+public:
+    // Constructors
+    IPAddress();
+    IPAddress(uint8_t first_octet, uint8_t second_octet, uint8_t third_octet, uint8_t fourth_octet);
+    IPAddress(uint32_t address);
+    IPAddress(const uint8_t *address);
+
+    // Overloaded cast operator to allow IPAddress objects to be used where a pointer
+    // to a four-byte uint8_t array is expected
+    operator uint32_t() const { return _address.dword; };
+    bool operator==(const IPAddress& addr) const { return _address.dword == addr._address.dword; };
+    bool operator==(const uint8_t* addr) const;
+
+    // Overloaded index operator to allow getting and setting individual octets of the address
+    uint8_t operator[](int index) const { return _address.bytes[index]; };
+    uint8_t& operator[](int index) { return _address.bytes[index]; };
+
+    // Overloaded copy operators to allow initialisation of IPAddress objects from other types
+    IPAddress& operator=(const uint8_t *address);
+    IPAddress& operator=(uint32_t address);
+
+    virtual size_t printTo(Print& p) const;
+
+    friend class EthernetClass;
+    friend class UDP;
+    friend class Client;
+    friend class Server;
+    friend class DhcpClass;
+    friend class DNSClient;
+};
+
+const IPAddress INADDR_NONE(0,0,0,0);
+
+
+#endif
diff --git a/STM32F1/cores/maple/Printable.h b/STM32F1/cores/maple/Printable.h
new file mode 100644
index 0000000..2a1b2e9
--- /dev/null
+++ b/STM32F1/cores/maple/Printable.h
@@ -0,0 +1,40 @@
+/*
+  Printable.h - Interface class that allows printing of complex types
+  Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef Printable_h
+#define Printable_h
+
+#include <stdlib.h>
+
+class Print;
+
+/** The Printable class provides a way for new classes to allow themselves to be printed.
+    By deriving from Printable and implementing the printTo method, it will then be possible
+    for users to print out instances of this class by passing them into the usual
+    Print::print and Print::println methods.
+*/
+
+class Printable
+{
+  public:
+    virtual size_t printTo(Print& p) const = 0;
+};
+
+#endif
+
diff --git a/STM32F1/cores/maple/Server.h b/STM32F1/cores/maple/Server.h
new file mode 100644
index 0000000..69e3e39
--- /dev/null
+++ b/STM32F1/cores/maple/Server.h
@@ -0,0 +1,30 @@
+/*
+  Server.h - Base class that provides Server
+  Copyright (c) 2011 Adrian McEwen.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef server_h
+#define server_h
+
+#include "Print.h"
+
+class Server : public Print {
+public:
+  virtual void begin() =0;
+};
+
+#endif
diff --git a/STM32F1/cores/maple/Udp.h b/STM32F1/cores/maple/Udp.h
new file mode 100644
index 0000000..dc5644b
--- /dev/null
+++ b/STM32F1/cores/maple/Udp.h
@@ -0,0 +1,88 @@
+/*
+ *  Udp.cpp: Library to send/receive UDP packets.
+ *
+ * NOTE: UDP is fast, but has some important limitations (thanks to Warren Gray for mentioning these)
+ * 1) UDP does not guarantee the order in which assembled UDP packets are received. This
+ * might not happen often in practice, but in larger network topologies, a UDP
+ * packet can be received out of sequence. 
+ * 2) UDP does not guard against lost packets - so packets *can* disappear without the sender being
+ * aware of it. Again, this may not be a concern in practice on small local networks.
+ * For more information, see http://www.cafeaulait.org/course/week12/35.html
+ *
+ * MIT License:
+ * Copyright (c) 2008 Bjoern Hartmann
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * bjoern@cs.stanford.edu 12/30/2008
+ */
+
+#ifndef udp_h
+#define udp_h
+
+#include <Stream.h>
+#include <IPAddress.h>
+
+class UDP : public Stream {
+
+public:
+  virtual uint8_t begin(uint16_t) =0;	// initialize, start listening on specified port. Returns 1 if successful, 0 if there are no sockets available to use
+  virtual void stop() =0;  // Finish with the UDP socket
+
+  // Sending UDP packets
+  
+  // Start building up a packet to send to the remote host specific in ip and port
+  // Returns 1 if successful, 0 if there was a problem with the supplied IP address or port
+  virtual int beginPacket(IPAddress ip, uint16_t port) =0;
+  // Start building up a packet to send to the remote host specific in host and port
+  // Returns 1 if successful, 0 if there was a problem resolving the hostname or port
+  virtual int beginPacket(const char *host, uint16_t port) =0;
+  // Finish off this packet and send it
+  // Returns 1 if the packet was sent successfully, 0 if there was an error
+  virtual int endPacket() =0;
+  // Write a single byte into the packet
+  virtual size_t write(uint8_t) =0;
+  // Write size bytes from buffer into the packet
+  virtual size_t write(const uint8_t *buffer, size_t size) =0;
+
+  // Start processing the next available incoming packet
+  // Returns the size of the packet in bytes, or 0 if no packets are available
+  virtual int parsePacket() =0;
+  // Number of bytes remaining in the current packet
+  virtual int available() =0;
+  // Read a single byte from the current packet
+  virtual int read() =0;
+  // Read up to len bytes from the current packet and place them into buffer
+  // Returns the number of bytes read, or 0 if none are available
+  virtual int read(unsigned char* buffer, size_t len) =0;
+  // Read up to len characters from the current packet and place them into buffer
+  // Returns the number of characters read, or 0 if none are available
+  virtual int read(char* buffer, size_t len) =0;
+  // Return the next byte from the current packet without moving on to the next byte
+  virtual int peek() =0;
+  virtual void flush() =0;	// Finish reading the current packet
+
+  // Return the IP address of the host who sent the current incoming packet
+  virtual IPAddress remoteIP() =0;
+  // Return the port of the host who sent the current incoming packet
+  virtual uint16_t remotePort() =0;
+protected:
+  uint8_t* rawIPAddress(IPAddress& addr) { return addr.raw_address(); };
+};
+
+#endif