tcp.c File Reference

#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <netdb.h>
#include <fcntl.h>
#include <errno.h>
#include "btserial.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "defs.h"
#include "tcp.h"

Go to the source code of this file.

Macros
#define	INVALID_SOCKET   (-1)
#define	SOCKET_ERROR   (-1)
#define	bailout(msg)   perror((msg))
#define	closesocket   close
#define	socksetblock(sock, y_n)
#define	UDP_PORT   3015
	default UDP broadcast port More...
#define	TCP_PORT   5555
#define	UDP_RECV_TIMEOUT   6
#define	TCP_CONNECT_TIMEOUT   1

Typedefs
typedef int	SOCKET
	BSD Sockets/Winsock2 I/O wrappers. More...

Functions
void *	tcp_open (const char *serial, unsigned timeout)
	connects to a ev3 device on the same subnet. More...
void	tcp_close (void *sock)
	releases the socket file descriptor opened by tcp_open() More...
const wchar_t *	tcp_error (void *fd_)
	Returns an error string describing the last error occured. More...

Variables
int(*	tcp_write )(void *device, const u8 *buf, size_t count) = bt_write
	writes buf[1] till buf[count - 2] to device More...
int(*	tcp_read )(void *device, u8 *buf, size_t count, int milliseconds) = bt_read
	writes buf[1] till buf[count - 2] to device More...

Macro Definition Documentation

#define bailout

(

msg

)

perror((msg))

Definition at line 38 of file tcp.c.

#define closesocket   close

Definition at line 39 of file tcp.c.

#define INVALID_SOCKET   (-1)

Definition at line 36 of file tcp.c.

#define SOCKET_ERROR   (-1)

Definition at line 37 of file tcp.c.

#define socksetblock	(		sock,
			y_n
	)

Value:

((y_n) ? \
    fcntl((sock), F_SETFL, fcntl((sock), F_GETFL, 0) & ~O_NONBLOCK) : \
    fcntl((sock), F_SETFL, O_NONBLOCK))

Definition at line 40 of file tcp.c.

#define TCP_CONNECT_TIMEOUT   1

Definition at line 68 of file tcp.c.

#define TCP_PORT   5555

Definition at line 65 of file tcp.c.

#define UDP_PORT   3015

default UDP broadcast port

Definition at line 64 of file tcp.c.

#define UDP_RECV_TIMEOUT   6

Definition at line 67 of file tcp.c.

Typedef Documentation

typedef int SOCKET

BSD Sockets/Winsock2 I/O wrappers.

Author

Ahmad Fatoum

Copyright

(c) 2015 Ahmad Fatoum. Code available under terms of the GNU General Public License 3.0

Definition at line 35 of file tcp.c.

Function Documentation

void tcp_close

(

void *

sock

)

releases the socket file descriptor opened by tcp_open()

Closes the resource opened by bt_open.

Parameters

[in]

device

handle returned by tcp_open()

Definition at line 241 of file tcp.c.

const wchar_t* tcp_error

(

void *

fd_

)

Returns an error string describing the last error occured.

Parameters

[in]

device

handle returned by tcp_open()

Returns

message An error string

Bug:

it's useless. Could use wprintf and strerror

Definition at line 256 of file tcp.c.

void* tcp_open	(	const char *	serial,
		unsigned	timeout
	)

connects to a ev3 device on the same subnet.

open a bluetooth device described by device. NULL leads to default action

Parameters

[in]

serial

IP-Address or Serial-Number of Ev3. NULL connects to the first available

Returns

&fd pointer to file descriptor for use with tcp_{read,write,close,error} If the serial number contains a dot, a direct TCP connection is attempted. The Ev3 broadcasts a UDP-packet every 5 seconds. This functions waits 7 seconds for that to happen. It then compares the broadcasted serial number with the value set should serial be non-NULL. If serial is NULL or the serial numbers match, a udp packet is sent to the source port on the ev3. Afterwards the Ev3 starts listening on the port it broadcasted. Then a GET request is sent and the VM starts listening and business is as usual

See also

http://www.monobrick.dk/guides/how-to-establish-a-wifi-connection-with-the-ev3-brick/

Definition at line 84 of file tcp.c.

Variable Documentation

int(* tcp_read) (void *device, u8 *buf, size_t count, int milliseconds) = bt_read

writes buf[1] till buf[count - 2] to device

Parameters

[in]	device	handle returned by bt_open
[in]	buf	buffer to write to
[in]	count	number of characters to be read
[in]	milliseconds	number of milliseconds to wait at maximum. -1 is indefinitely

Returns

status -1 on error. bytes read otherwise.

Bug:

the milliseconds part needs to be tested more throughly

See also

implementation at bt-win.c and bt-unix.c

Definition at line 272 of file tcp.c.

int(* tcp_write) (void *device, const u8 *buf, size_t count) = bt_write

writes buf[1] till buf[count - 2] to device

Parameters

[in]	device	handle returned by bt_open
[in]	buf	byte string to write, the first byte is omitted
[in]	count	number of characters to be written (including leading ignored byte)

Returns

status -1 on error. bytes read otherwise.

Bug:

the first byte is omitted for compatiblity with the leading report byte demanded by hid_write. Wrapping HIDAPI could fix this.

See also

implementation at bt-win.c and bt-unix.c

Definition at line 271 of file tcp.c.