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; }