Everyone

Ferdinand Stueckler

Froyo

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; 
}

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