start

 void start_connection_server(){
		enum stts status;
		struct sockaddr_in addr;
		int addrlen, sock, cnt;
		struct ip_mreq mreq;
		char message[193];
		char server_name[20] = "Unul dintre servere";
		int port_tcp = htons(6001); //transforma portul din int pe 16 biti in cod specific de retea,unsigned short or an uint16_t equal to 2 bytes or 16 bits.

		message[193] = "";
		memcpy(message, server_name, 20);
		memcpy(&message[20], &port_tcp, sizeof(port_tcp));

		sock = socket(AF_INET, SOCK_DGRAM, 0);
		if (sock < 0) {
			perror("socket");
			exit(1);
		}
		bzero((char *) &addr, sizeof(addr));
		addr.sin_family = AF_INET;
		addr.sin_addr.s_addr = htonl(INADDR_ANY); //The htonl() function converts the unsigned integer hostlong from host byte order to network byte order.
		addr.sin_port = htons(EXAMPLE_PORT);
		addrlen = sizeof(addr);

		pthread_create(&start_tcp_server, NULL, &MyThread, NULL);

		if (argc <= 1) {

			/* receive */
			if (bind(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
				perror("bind");
				exit(1);
			}
			mreq.imr_multiaddr.s_addr = inet_addr(EXAMPLE_GROUP);
			mreq.imr_interface.s_addr = htonl(INADDR_ANY);
			if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) //
			< 0) {
				perror("setsockopt mreq");
				exit(1);
			}
			int l = 0;
			while (1) {
				cnt = recvfrom(sock, message, sizeof(message), 0,
						(struct sockaddr *) &addr, &addrlen);

				if (cnt < 0) {
					perror("recvfrom");
					exit(1);
				} else if (cnt == 0) {
					break;
				}
				memcpy(message, server_name, 20);
				memcpy(&message[20], &port_tcp, sizeof(port_tcp));

				// Start the server

				cnt = sendto(sock, message, sizeof(message), 0,
						(struct sockaddr *) &addr, addrlen);

				if (cnt < 0) {
					perror("sendto");
					exit(1);
				}
				printf("%s: message = \" %d \n", inet_ntoa(addr.sin_addr), message);
				l++;
			}
		}
		return 0;
 }