protocol/usb_hid/arduino-1.0.1/cores/arduino/Udp.h

   1 /*
   2  *  Udp.cpp: Library to send/receive UDP packets.
   3  *
   4  * NOTE: UDP is fast, but has some important limitations (thanks to Warren Gray for mentioning these)
   5  * 1) UDP does not guarantee the order in which assembled UDP packets are received. This
   6  * might not happen often in practice, but in larger network topologies, a UDP
   7  * packet can be received out of sequence.
   8  * 2) UDP does not guard against lost packets - so packets *can* disappear without the sender being
   9  * aware of it. Again, this may not be a concern in practice on small local networks.
  10  * For more information, see http://www.cafeaulait.org/course/week12/35.html
  11  *
  12  * MIT License:
  13  * Copyright (c) 2008 Bjoern Hartmann
  14  * Permission is hereby granted, free of charge, to any person obtaining a copy
  15  * of this software and associated documentation files (the "Software"), to deal
  16  * in the Software without restriction, including without limitation the rights
  17  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  18  * copies of the Software, and to permit persons to whom the Software is
  19  * furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice shall be included in
  22  * all copies or substantial portions of the Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  29  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  30  * THE SOFTWARE.
  31  *
  32  * bjoern@cs.stanford.edu 12/30/2008
  33  */
  34
  35 #ifndef udp_h
  36 #define udp_h
  37
  38 #include <Stream.h>
  39 #include <IPAddress.h>
  40
  41 class UDP : public Stream {
  42
  43 public:
  44   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
  45   virtual void stop() =0;  // Finish with the UDP socket
  46
  47   // Sending UDP packets
  48
  49   // Start building up a packet to send to the remote host specific in ip and port
  50   // Returns 1 if successful, 0 if there was a problem with the supplied IP address or port
  51   virtual int beginPacket(IPAddress ip, uint16_t port) =0;
  52   // Start building up a packet to send to the remote host specific in host and port
  53   // Returns 1 if successful, 0 if there was a problem resolving the hostname or port
  54   virtual int beginPacket(const char *host, uint16_t port) =0;
  55   // Finish off this packet and send it
  56   // Returns 1 if the packet was sent successfully, 0 if there was an error
  57   virtual int endPacket() =0;
  58   // Write a single byte into the packet
  59   virtual size_t write(uint8_t) =0;
  60   // Write size bytes from buffer into the packet
  61   virtual size_t write(const uint8_t *buffer, size_t size) =0;
  62
  63   // Start processing the next available incoming packet
  64   // Returns the size of the packet in bytes, or 0 if no packets are available
  65   virtual int parsePacket() =0;
  66   // Number of bytes remaining in the current packet
  67   virtual int available() =0;
  68   // Read a single byte from the current packet
  69   virtual int read() =0;
  70   // Read up to len bytes from the current packet and place them into buffer
  71   // Returns the number of bytes read, or 0 if none are available
  72   virtual int read(unsigned char* buffer, size_t len) =0;
  73   // Read up to len characters from the current packet and place them into buffer
  74   // Returns the number of characters read, or 0 if none are available
  75   virtual int read(char* buffer, size_t len) =0;
  76   // Return the next byte from the current packet without moving on to the next byte
  77   virtual int peek() =0;
  78   virtual void flush() =0;      // Finish reading the current packet
  79
  80   // Return the IP address of the host who sent the current incoming packet
  81   virtual IPAddress remoteIP() =0;
  82   // Return the port of the host who sent the current incoming packet
  83   virtual uint16_t remotePort() =0;
  84 protected:
  85   uint8_t* rawIPAddress(IPAddress& addr) { return addr.raw_address(); };
  86 };
  87
  88 #endif