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<tt>Hi, Rodrigo!<br>
<br>
The logs you are tracing are printed when OpenSIPS receives
something from the client, and then immediately responds back. Due
to the fact that we don't see any other debug messages, like SIP
parsing & stuff, makes me think that it is a CRLF pinging -
the client periodically sends a CRLFCRLF TCP message to OpenSIPS,
and OpenSIPS responds with a single CRLF. Note that this is
different from a TCP keep-alive, where each peer send a 0-length
TCP message, without any body. That message doesn't even get to
the application layer.<br>
However, tracing the communication between OpenSIPS and the client
should confirm the above :).<br>
<br>
Best regards,<br>
</tt>
<pre class="moz-signature" cols="72">Răzvan Crainea
OpenSIPS Solutions
<a class="moz-txt-link-abbreviated" href="http://www.opensips-solutions.com">www.opensips-solutions.com</a></pre>
<div class="moz-cite-prefix">On 10/26/2016 05:10 PM, Rodrigo Pimenta
Carvalho wrote:<br>
</div>
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<p>Dear OpenSIPS users,<br>
</p>
<p><br>
</p>
<p>In the OpenSIPS log I see:<br>
</p>
<p><br>
</p>
<div>Jan 01 19:30:38 colibri-imx6-jfl opensips[3444]: Jan 1
19:30:38 [3451] DBG:core:tcp_read_req: Using the global ( per
process ) buff<br>
Jan 01 19:30:38 colibri-imx6-jfl opensips[3444]: Jan 1
19:30:38 [3451] DBG:core:tcp_handle_req: content-length= 0<br>
Jan 01 19:30:38 colibri-imx6-jfl opensips[3444]: Jan 1
19:30:38 [3451] DBG:core:async_tsend_stream: Async successful
write from first try on 0x74e13548<br>
Jan 01 19:30:38 colibri-imx6-jfl opensips[3444]: Jan 1
19:30:38 [3451] DBG:core:tcp_read_req: tcp_read_req end<br>
<br>
The frequency is 1 time at each 1,5 minute. There is only one
client online. I suspect that OpenSIPS uses the socket
<span>0x74e13548</span> to send messages to such client. The
client became online using TCP.<br>
<br>
Just to confirm, is this log a result of a TCP keep alive
function enabled?<br>
<br>
Best regards.<br>
<br>
<br>
</div>
<p><br>
</p>
<p><br>
</p>
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<div class="PlainText">RODRIGO PIMENTA CARVALHO<br>
Inatel Competence Center<br>
Software<br>
Ph: +55 35 3471 9200 RAMAL 979<br>
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<br>
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