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Network Remote Control for sending positional information to microcontroller.
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; }