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;
}