NetSimple

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;

}