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64 lines
2.8 KiB
C++
64 lines
2.8 KiB
C++
/*
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* Udp.cpp: Library to send/receive UDP packets with the Arduino ethernet shield.
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* This version only offers minimal wrapping of socket.c/socket.h
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* Drop Udp.h/.cpp into the Ethernet library directory at hardware/libraries/Ethernet/
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*
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* NOTE: UDP is fast, but has some important limitations (thanks to Warren Gray for mentioning these)
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* 1) UDP does not guarantee the order in which assembled UDP packets are received. This
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* might not happen often in practice, but in larger network topologies, a UDP
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* packet can be received out of sequence.
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* 2) UDP does not guard against lost packets - so packets *can* disappear without the sender being
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* aware of it. Again, this may not be a concern in practice on small local networks.
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* For more information, see http://www.cafeaulait.org/course/week12/35.html
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*
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* MIT License:
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* Copyright (c) 2008 Bjoern Hartmann
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* bjoern@cs.stanford.edu 12/30/2008
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*/
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#ifndef udp_h
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#define udp_h
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#define UDP_TX_PACKET_MAX_SIZE 24
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class UdpClass {
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private:
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uint8_t _sock; // socket ID for Wiz5100
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uint16_t _port; // local port to listen on
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public:
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void begin(uint16_t); // initialize, start listening on specified port
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int available(); // has data been received?
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// C-style buffer-oriented functions
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uint16_t sendPacket(uint8_t *, uint16_t, uint8_t *, uint16_t); //send a packet to specified peer
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uint16_t sendPacket(const char[], uint8_t *, uint16_t); //send a string as a packet to specified peer
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int readPacket(uint8_t *, uint16_t); // read a received packet
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int readPacket(uint8_t *, uint16_t, uint8_t *, uint16_t *); // read a received packet, also return sender's ip and port
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// readPacket that fills a character string buffer
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int readPacket(char *, uint16_t, uint8_t *, uint16_t &);
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};
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extern UdpClass Udp;
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#endif
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