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-/*
- * Udp.cpp: Library to send/receive UDP packets with the Arduino ethernet shield.
- * This version only offers minimal wrapping of socket.c/socket.h
- * Drop Udp.h/.cpp into the Ethernet library directory at hardware/libraries/Ethernet/
- *
- * 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 ethernetudp_h
-#define ethernetudp_h
-
-#include <Udp.h>
-
-#define UDP_TX_PACKET_MAX_SIZE 24
-
-class EthernetUDP : public UDP {
-private:
- uint8_t _sock; // socket ID for Wiz5100
- uint16_t _port; // local port to listen on
- IPAddress _remoteIP; // remote IP address for the incoming packet whilst it's being processed
- uint16_t _remotePort; // remote port for the incoming packet whilst it's being processed
- uint16_t _offset; // offset into the packet being sent
- uint16_t _remaining; // remaining bytes of incoming packet yet to be processed
-
-public:
- EthernetUDP(); // Constructor
- virtual uint8_t begin(uint16_t); // initialize, start listening on specified port. Returns 1 if successful, 0 if there are no sockets available to use
- virtual void stop(); // 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);
- // 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);
- // Finish off this packet and send it
- // Returns 1 if the packet was sent successfully, 0 if there was an error
- virtual int endPacket();
- // Write a single byte into the packet
- virtual size_t write(uint8_t);
- // Write size bytes from buffer into the packet
- virtual size_t write(const uint8_t *buffer, size_t size);
-
- using Print::write;
-
- // 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();
- // Number of bytes remaining in the current packet
- virtual int available();
- // Read a single byte from the current packet
- virtual int read();
- // 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);
- // 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) { return read((unsigned char*)buffer, len); };
- // Return the next byte from the current packet without moving on to the next byte
- virtual int peek();
- virtual void flush(); // Finish reading the current packet
-
- // Return the IP address of the host who sent the current incoming packet
- virtual IPAddress remoteIP() { return _remoteIP; };
- // Return the port of the host who sent the current incoming packet
- virtual uint16_t remotePort() { return _remotePort; };
-};
-
-#endif