NetSimple

Rete di controllo remoto per l'invio di informazioni di posizione al microcontrollore.

The purpose of the app is to control remote hardware like Arduino, Netduino, Raspberry Pi ...

The protocol is TCP/IP (Client).

UP: 0, power, 0

DOWN: 0, -power, 0

LEFT: -power, power, 0

RIGHT: power, power, 0

MIDDLE: 0, 0, 0 or 0, 0, power (Zero active)

Byte Mode: 3 positions are transfered as 3 bytes (default)

ASCII Mode: 3 positions are transfered as text seperated by comma (ended by \n)

Session inactive: Each transmission in a serated connection

Session active: Connection never closed, but if necessary automatic reconnect (default)

Zero inactive: No return to zero values after release

Zero active: Auto return to zero values after release

Sample code for a server on Raspberry Pi:

#include "stdio.h"

#include "stdlib.h"

#include "string.h"

#include "unistd.h"

#include "sys/types.h"

#include "sys/socket.h"

#include "netinet/in.h"

void error(const char *msg)

{

perror(msg);

exit(1);

}

int main(int argc, char *argv[])

{

int sockfd, newsockfd, portno,n;

socklen_t clilen;

char buffer[256];

struct sockaddr_in serv_addr, cli_addr;

sockfd = socket(AF_INET, SOCK_STREAM, 0);

if (sockfd < 0)

error("ERROR opening socket");

bzero((char *) &serv_addr, sizeof(serv_addr));

portno = 12345;

serv_addr.sin_family = AF_INET;

serv_addr.sin_addr.s_addr = INADDR_ANY;

serv_addr.sin_port = htons(portno);

if (bind(sockfd, (struct sockaddr *)

&serv_addr, sizeof(serv_addr)) < 0)

error("ERROR on binding");

while(1)

{

listen(sockfd,5);

clilen = sizeof(cli_addr);

newsockfd = accept(sockfd, (struct sockaddr *)

&cli_addr, &clilen);

if (newsockfd < 0)

error("ERROR on accept");

while(1)

{

bzero(buffer,256);

n = read(newsockfd,buffer,3);

if (n < 3)

{

error("ERROR reading from socket");

break;

}

float tmp1 = (float)buffer[0];

if (tmp1 > 127)

tmp1 -= 256;

float tmp2 = (float)buffer[1];

if (tmp2 > 127)

tmp2 -= 256;

float tmp3 = (float)buffer[2];

if (tmp3 > 127)

tmp3 -=256;

printf("%d %d %d\n",(int)tmp1,(int)tmp2,(int)tmp3);

}

close(newsockfd);

}

close(sockfd);

return 0;

}