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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