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

[Babak Yakhchali]

thank you all for your answers. As I want to implement it using only java
and tcp I think using session heartbeat with a monitoring timer is my best
solution.

On Wed, Aug 5, 2015 at 3:21 PM, Regis M <regis.freeswitch.org at tornad.net>
wrote:

> As Stanislas said.. in TCP, broken socket is detected by client only if
> server closes it properly or client is trying to sending something on
> closed/died server socket.... I think in nodejs, an open connection will
> wait forever too if not sending anything.
>
> 2015-08-05 12:35 GMT+02:00 Danny Gershman <danny.gershman at gmail.com>:
>
>> 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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>
>
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