Mqtt connection timeout setting

[Stratosphere]

Hi, 

We have observed that in areas of poor lte connectivity, the client_inti() works well but the mqtt_connect() takes a couple of minutes and times out.

I need to change the mqtt connection timeout duration make it 20-30 seconds, since if it does not connect in this duration, for our use-case, it wont connect after either and the firmware can move on.

In decent lte connectivity regions, mqtt_connect returns within a second or less.

Thanks

Noaman

[Stratosphere]

Hi Haken,

I am currently using sdk 1.4.2. should this work on it?

It does not seem to be working for me. here is the console log

RRC mode: Connected
getaddrInfo errno: 0
fcntl nonblocking set: 0. fd : 0, flags: 16384, rflags: 16384
In http timer. http state: 3, currentState: 0, httpQuit: 0
In http timer. http state: 3, currentState: 3, httpQuit: 0
http waiting to connect
http: Connected

"in http timer" is printed every 5 second by a timer callback. "http waiting to connect" is printed from within the do while loop as per code below:

flags = fcntl(fd, F_GETFL, 0);
ret = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
rflags = fcntl(fd, F_GETFL, 0);	
printk("fcntl nonblocking set: %d. fd : %d, flags: %d, rflags: %d\n", ret, fd, flags, rflags);

fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TLS_1_2);
if (fd == -1) 
{
	if (DEBUG_PRINT_HTTP) printk("Failed to open socket!\n");
	errorReason = ERROR_HTTP_SOCKET_FAILED;
	goto clean_up;
}

httpState = 2;
/* Setup TLS socket options */
err = httpTlsSetup(fd);
if (err) 
{
	errorReason = ERROR_HTTP_SECURECLIENT_INIT_FAIL;
	goto clean_up;
}

httpState = 3;

//Connect
{
	waitingToConnect = 0;
	do 
	{
		err = connect(fd, res->ai_addr , sizeof(struct sockaddr_in));
		k_sleep(100);
		waitingToConnect++;
		printk("http waiting to connect\n");
	} while ((err == EINPROGRESS) && (waitingToConnect <300));

	if (err || waitingToConnect >=300)
	{
		if (DEBUG_PRINT_HTTP) printk("connect() failed, time: %d, err: %d\n", waitingToConnect, errno);
		if (errno == 23)
			sys_reboot(0);

		errorReason = ERROR_HTTP_CONNECT_FAILED;
		goto clean_up;
	}
	if (DEBUG_PRINT_HTTP) printk("http: Connected\n");
}

"http waiting to connect" should be printed every 100ms if connect() is non-blocking. so it seems that connect() is still using a blocking call.

[Håkon Alseth]

Hi,

 

My apologies for the late reply.

 

Stratosphere said:

I am currently using sdk 1.4.2. should this work on it?

This functionality was not added until more recent. Is it technically possible for you to use a newer ncs version?

 

Kind regards,

Håkon