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Note:This code expects to be using sockets blocking I/O request, to use non blocking I/O we should use libevent or a similar solution (like threads), this is outside of the scope of this code. It also assumes that we already have the server listening on a port and that we have already accepted a client connection `cliente_socket`. RCVBUFFER is 256.
char buffer[RCVBUFFER + 2]; buffer[RCVBUFFER] = 0; char response[] = {2,6,1,0,7,1,0,2,1,6,0x81}; int message_size,i,j; char counter = 0; if (( message_size = recv(client_socket, buffer, RCVBUFFER, 0)) < 0 ) err_handler ("recv() failed"); if ( message_size == 17 ) { if ( send(client_socket, response, 11, 0) != 11 ) err_handler ("send() failed"); } else { printf ( "- %d - \n", message_size ); err_handler ("Protocol Error"); } printf ("Starting...\n"); for (;;) { if (( message_size = recv(client_socket, buffer, RCVBUFFER, 0)) < 0 ) err_handler ("recv() failed"); if (message_size > 5 && bufer[0] == -128) counter = buffer[3]; i = (buffer[0] == -128)? 5 : 0; buffer[message_size + 1] = '\0'; buffer[message_size] = '\n'; //printf ("Capturing %d bytes\n",message_size); fprintf (stderr, "%s",&buffer[i]); //printf ("Current Counter : %d\n",counter); if (message_size == 1) { if (buffer[0] == 0x50) { char respond[] = {0x51}; if ( send (client_socket, respond, 1, 0) != 1) err_handler("send() failed"); } } else { i = message_size - 1; if (buffer[i-2] == 0x20 && buffer[i-1] == 0x0d && buffer[i] == 0x0a) { char respond[] = {0x40, 0x05, 0x01, ++counter, 0x81}; if ( send (client_socket, respond, 5, 0) != 5 ) err_handler("send() failed"); } } /* Do Something with the Data we received */ }
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