[Freeswitch-users] using enable_heartbeat to detect network problems in event_socket

[Danny Gershman]

Not sure this is helpful for you, but create a simple TCP socket connection
with NodeJS.  When there is a connection failure an immediate callback
occurs.

On Wed, Aug 5, 2015 at 6:25 AM Stanislav Sinyagin <ssinyagin at gmail.com>
wrote:

> it's not Java-specific really.
>
> Imagine you have an open TCP connection that has no traffic, and
> somewhere inbetween there's a network failure. You will only know
> about it when you start sending the data, and the TCP timeout occurs.
> You will get the socket error exception only after all retransmission
> attempts failed, and that may take quite some significant time. If
> ICMP is allowed in the network, some failures would generate ICMP
> messages which will speed up the process, but you can't rely on this.
>
> So, if you need to know about the failure quickly enough, you need to
> monitor the server reachability with some connectionless protocol,
> like ICMP echo or some UDP-based keepalive.
>
>
>
>
>
> On Wed, Aug 5, 2015 at 11:14 AM, Michael Jerris <mike at jerris.com> wrote:
> > are you saying Java provides no way to detect a tcp socket disconnect?
> >
> >
> > On Wednesday, August 5, 2015, Babak Yakhchali <
> babak.freeswitch at gmail.com>
> > wrote:
> >>
> >> but if for example network connection is lost the socket will remain
> open
> >> forever!
> >>
> >> On Wed, Aug 5, 2015 at 12:04 PM, Michael Jerris <mike at jerris.com>
> wrote:
> >>>
> >>> I would just detect the socket closing instead of using a heartbeat for
> >>> sure
> >>>
> >>>
> >>> On Wednesday, August 5, 2015, Babak Yakhchali
> >>> <babak.freeswitch at gmail.com> wrote:
> >>>>
> >>>> Hi
> >>>> I'm using pure java sockets (not current available esl
> implementations)
> >>>> with event_socket to control sessions. to detect lan disconnects I'm
> using
> >>>> session_heartbeat events every 1 second (this is adjustable).
> Considering
> >>>> performance is this a bad approach or not ? any better suggestions?
> >>>> if I execute enable_heartbeat before answering the call this message
> is
> >>>> printed on console:
> >>>> switch_core_session.c:1555 sofia/internal/1000 at 172.16.90.1 using
> >>>> scheduler due to bypass media or media is not established.
> >>>>
> >>>> should I answer the session before calling enable_heartbeat?
> >>>> thanks
> >>>
> >>>
> >>>
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> >>
> >
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