topic Re: Connect to TCP Server time-out issue. in MQX Software Solutions

Connect to TCP Server time-out issue.

tongjianwu — Wed, 25 May 2016 09:07:00 GMT

Hello everyone!

When creating one TCP client socket in my board to connect other TCP server which is unreachable, the time-out interval is very long, so whether can I modify the interval to some little certain value，less than 20 seconds ?

The following is the default value:

Connect Timeout

                    "> Option name OPT_CONNECT_TIMEOUT
                         Protocol level SOL_TCP
                         Values >=180,000 (RTCS maintains the connection for this number of milliseconds).
                         Default value 480,000 (eight minutes).

Thanks!

From sincerely Jianwu.

Re: Connect to TCP Server time-out issue.

tongjianwu — Wed, 25 May 2016 17:29:17 GMT

Need help,thanks.

Re: Connect to TCP Server time-out issue.

soledad — Wed, 25 May 2016 20:01:10 GMT

Hello Jianwu,

The RTCS setsockopt() API permits the application to set the OPT_CONNECT_TIMEOUT option on a stream socket, which indicates the timeout (in millisec.) when a call to the connect API using that socket will return indicating a connection time-out error.

The RTCS User's Guide appears to indicate the value specified for the OPT_CONNECT_TIMEOUT option is to be >= 180000 msec.

You can change TCP_SENDTIMEOUT_MIN (tcp_prv.h) to your expected value

#define TCP_SENDTIMEOUT_MIN 100000L /* as per RFC1122 4.2.3.5 */

But it is not recommended, because it violates the RFC1122

Have a great day,
Sol

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Re: Connect to TCP Server time-out issue.

tongjianwu — Thu, 26 May 2016 02:04:17 GMT

Hi,Sol

Thanks for your quickly reply.

I modified the macro "TCP_SENDTIMEOUT_MIN",now it works.

When the value is modified,what bad things can happen?

Best Regards.