How to set a udp socket peer connect timeout?

Question

Using the latest nRF_Connect_SDK 
 How can we set a udp/dtls socket, peer connect timeout for this call: 
 //** zsock_connect - connect socket to peer network
	//** https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/zephyr/connectivity/networking/api/sockets.html
	err = connect(client_fd, (struct sockaddr *)&host_addr, sizeof(struct sockaddr_in));
	if (err < 0) {
 printk("Connect failed : %d
", errno);
 goto error;
	}
	else {
 DBG_PRINTF("Server Connected
");
	}
 
 If there is no way to set a timeout for the call itself, is there a way to abort the call? Then a separate timeout can be set. 
 Thanks.

Ron Segal · Accepted Answer

Hi Sigurd 
 Yes, bearing in mind that this is a dtls link (as mentioned above, although the question should probably have been titled that), connect (zsock_connect) is blocking. This is clear because the print diagnostics in the code above is never reached until the call eventually times out. 
 However, by implementing the SO_SNDTIMEO socket option that you mentioned, the dtls connect is now timing out at the set number of seconds. Here's code that works: 
 struct timeval timeo = {
 .tv_sec = 5,
 .tv_usec = 0,
	};

	err = setsockopt(client_fd, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo));
	if (err) {
 DBG_PRINTF("Failed to set socket timeout, errno %d", errno);
 err = -errno;
 goto error;
	}

	DBG_PRINTF("Trying to connect to: ");
#ifdef CONFIG_PRINT_DBG
	printhex(host_addr.data,sizeof(host_addr.data));
#endif
	DBG_PRINTF("
");

	//** zsock_connect - connect socket to dtls peer - our udp2mqtt gateway
	//** https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/zephyr/connectivity/networking/api/sockets.html
	err = connect(client_fd, (struct sockaddr *)&host_addr, sizeof(struct sockaddr_in));
	if (err < 0) {
 printk("Connect failed : %d
", errno);
 goto error;
	}
	else {
 DBG_PRINTF("Server Connected
");
	}

	return 0;
 
 So problem solved. Thanks for your help in putting me on the right track. 
 Cheers, Ron

How to set a udp socket peer connect timeout?

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