ESP8266
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) {
86  return addr.raw_address();
87  }
88 };
89 
90 #endif
Definition: Stream.h:38
virtual uint8_t begin(uint16_t)=0
virtual int read()=0
uint8_t * rawIPAddress(IPAddress &addr)
Definition: Udp.h:85
virtual uint16_t remotePort()=0
virtual void stop()=0
virtual int peek()=0
uint8_t * raw_address()
Definition: IPAddress.h:40
Definition: IPAddress.h:29
virtual size_t write(uint8_t)=0
virtual IPAddress remoteIP()=0
Definition: Udp.h:41
virtual int parsePacket()=0
virtual int available()=0
virtual void flush()=0
virtual int endPacket()=0
virtual int beginPacket(IPAddress ip, uint16_t port)=0