Re: Change TCP_USER_TIMEOUT

From: JH (jupiter.hce_at_[hidden])
Date: 2019-11-01 10:01:45

Hi,

I tried to use setsockopt(socket_fd, SOL_TCP, TCP_USER_TIMEOUT,
&tcpTimeout, sizeof(int)) to set up TCP_USER_TIMEOUT, but stuck with
the boost::asio::ssl::stream<boost::asio::ip::tcp::socket>, how could
I get socket file handler number from the boost asio socket?

Thank you.

Kind regards,

- jh

On 10/31/19, JH <jupiter.hce_at_[hidden]> wrote:
> Hi,
>
> I am using boost asio TCP socket in my device application for network
> connection in Linux platform.
>
> I am troubled currently by long TCP tmeout issues in a device to
> switch application between WiFi and 4G LTE.
>
> If my application TCP was connected via 4G LTE initially, when WiFi is
> available, the network is switched to WiFi, but the application TCP
> connection would  have 30 minutes timeout before it terminated the 4G
> LTE and reconnects to WiFi. That 30 minutes is too long.
>
> I checked TCP document for TCP_USER_TIMEOUT:
>
> TCP_USER_TIMEOUT
> Decreasing user timeouts allows applications to "fail fast", if so
> desired.  Otherwise, failure may take up to 20 minutes with the
> current system defaults in a normal WAN environment.
>
> My question is, in boost asio socket, is there an API to change
> TCP_USER_TIMEOUT?
>
> Appreciate if showing an example or point me to a document how to do it.
>
> Thank you.
>
> Kind regards,
>
> - jh
>