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start separate client to 2 new clients
one for publisher and other for subscriber

    1: #include "global.h"
    2: #include "mqtt.h"
    3: 
    4: 
    5: int
    6: InitClient(void)
    7: {
    8: 	int sock;
    9: 
   10: 	sock = socket(args->addr.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
   11: 	if (sock == -1) {
   12: 		printf("Error:: socket() #%d - %s\n", errno, strerror(errno));
   13: 		return -1;
   14: 	}
   15: 	if (connect(sock, &args->addr.sa, args->addr.sa.sa_len) == -1) {
   16: 		printf("Error:: connect() #%d - %s\n", errno, strerror(errno));
   17: 		return -1;
   18: 	}
   19: 
   20: 	return sock;
   21: }
   22: 
   23: int
   24: try2Connect(int sock)
   25: {
   26: 	int siz = 0;
   27: 	struct pollfd pfd;
   28: 
   29: 	siz = mqtt_msgCONNECT(args->msg, (char*) AIT_GET_STR(&args->ConnID), args->ka, 
   30: 			(char*) AIT_GET_STR(&args->User), (char*) AIT_GET_STR(&args->Pass), 
   31: 			(char*) args->Will.Topic.val.string, (char*) args->Will.Msg.val.string, 
   32: 			!args->notClear, args->QoS, args->Retain);
   33: 	if (siz == -1) {
   34: 		printf("Error:: msgCONNECT #%d - %s\n", mqtt_GetErrno(), mqtt_GetError());
   35: 		return -1;
   36: 	}
   37: 
   38: 	siz = send(sock, args->msg->msg_base, siz, 0);
   39: 	if (siz == -1) {
   40: 		printf("Error:: send() #%d - %s\n", errno, strerror(errno));
   41: 		return -1;
   42: 	} else
   43: 		ioVERBOSE(3) printf("Sended CONNECT %d bytes\n", siz);
   44: 
   45: 	pfd.fd = sock;
   46: 	pfd.events = POLLIN;
   47: 	switch (poll(&pfd, 1, args->ka * 1000)) {
   48: 		case -1:
   49: 			printf("Error:: poll() #%d - %s\n", errno, strerror(errno));
   50: 			return -1;
   51: 		case 0:
   52: 			ioVERBOSE(3) printf("Timeout reached (%d) ...\n", args->ka * 1000);
   53: 			return -1;
   54: 	}
   55: 	if (pfd.revents & (POLLERR | POLLHUP | POLLNVAL))
   56: 		return -1;
   57: 
   58: 	siz = recv(sock, args->msg->msg_base, args->msg->msg_len, 0);
   59: 	if (siz == -1) {
   60: 		printf("Error:: recv() #%d - %s\n", errno, strerror(errno));
   61: 		return -1;
   62: 	} else
   63: 		ioVERBOSE(3) printf("Received %d bytes\n", siz);
   64: 
   65: 	return (u_char) mqtt_readCONNACK(args->msg);
   66: }