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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/diameter-1.3.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>Diameter</strong><br><strong>Reference Manual</strong><br><small>Version 1.3</small></p>
<br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Table of Contents</strong></small></p>
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<li id="no" title="diameter " expanded="false">diameter<ul>
<li><a href="diameter.html">
Top of manual page
</a></li>
<li title="add_transport-2"><a href="diameter.html#add_transport-2">add_transport/2</a></li>
<li title="call-4"><a href="diameter.html#call-4">call/4</a></li>
<li title="origin_state_id-0"><a href="diameter.html#origin_state_id-0">origin_state_id/0</a></li>
<li title="remove_transport-2"><a href="diameter.html#remove_transport-2">remove_transport/2</a></li>
<li title="service_info-2"><a href="diameter.html#service_info-2">service_info/2</a></li>
<li title="services-0"><a href="diameter.html#services-0">services/0</a></li>
<li title="session_id-1"><a href="diameter.html#session_id-1">session_id/1</a></li>
<li title="start-0"><a href="diameter.html#start-0">start/0</a></li>
<li title="start_service-2"><a href="diameter.html#start_service-2">start_service/2</a></li>
<li title="stop-0"><a href="diameter.html#stop-0">stop/0</a></li>
<li title="stop_service-1"><a href="diameter.html#stop_service-1">stop_service/1</a></li>
<li title="subscribe-1"><a href="diameter.html#subscribe-1">subscribe/1</a></li>
<li title="unsubscribe-1"><a href="diameter.html#unsubscribe-1">unsubscribe/1</a></li>
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</li>
<li title="diameterc"><a href="diameterc.html">diameterc</a></li>
<li id="no" title="diameter_app " expanded="false">diameter_app<ul>
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</a></li>
<li title="Mod:peer_up-3"><a href="diameter_app.html#Mod:peer_up-3">Mod:peer_up/3</a></li>
<li title="Mod:peer_down-3"><a href="diameter_app.html#Mod:peer_down-3">Mod:peer_down/3</a></li>
<li title="Mod:pick_peer-4"><a href="diameter_app.html#Mod:pick_peer-4">Mod:pick_peer/4</a></li>
<li title="Mod:prepare_request-3"><a href="diameter_app.html#Mod:prepare_request-3">Mod:prepare_request/3</a></li>
<li title="Mod:prepare_retransmit-3"><a href="diameter_app.html#Mod:prepare_retransmit-3">Mod:prepare_retransmit/3</a></li>
<li title="Mod:handle_answer-4"><a href="diameter_app.html#Mod:handle_answer-4">Mod:handle_answer/4</a></li>
<li title="Mod:handle_error-4"><a href="diameter_app.html#Mod:handle_error-4">Mod:handle_error/4</a></li>
<li title="Mod:handle_request-3"><a href="diameter_app.html#Mod:handle_request-3">Mod:handle_request/3</a></li>
</ul>
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<li title="decode-2"><a href="diameter_codec.html#decode-2">decode/2</a></li>
<li title="encode-2"><a href="diameter_codec.html#encode-2">encode/2</a></li>
</ul>
</li>
<li title="diameter_dict"><a href="diameter_dict.html">diameter_dict</a></li>
<li id="no" title="diameter_make " expanded="false">diameter_make<ul>
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</a></li>
<li title="codec-2"><a href="diameter_make.html#codec-2">codec/2</a></li>
</ul>
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<li id="no" title="diameter_transport " expanded="false">diameter_transport<ul>
<li><a href="diameter_transport.html">
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</a></li>
<li title="Mod:start-3"><a href="diameter_transport.html#Mod:start-3">Mod:start/3</a></li>
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<li id="no" title="diameter_tcp " expanded="false">diameter_tcp<ul>
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<li title="start-3"><a href="diameter_tcp.html#start-3">start/3</a></li>
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<li id="loadscrollpos" title="diameter_sctp " expanded="true">diameter_sctp<ul>
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<li title="start-3"><a href="diameter_sctp.html#start-3">start/3</a></li>
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<!-- refpage --><center><h1>diameter_sctp</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">diameter_sctp</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">Diameter transport over SCTP.</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>
This module implements diameter transport over SCTP using <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','gen_sctp.html');">gen_sctp(3)</a></span>.
It can be specified as the value of a transport_module option to
<span class="bold_code"><a href="diameter.html#add_transport-2">diameter:add_transport/2</a></span>
and implements the behaviour documented in
<span class="bold_code"><a href="diameter_transport.html">diameter_transport(3)</a></span>.</p>
<a name="start"></a>
</p></div>
<h3>EXPORTS</h3>
<p><a name="start-3"><span class="bold_code">start({Type, Ref}, Svc, [Opt])
-> {ok, Pid, [LAddr]} | {error, Reason}</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Type = connect | accept</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Ref = <span class="bold_code"><a href="diameter.html#transport_ref">diameter:transport_ref()</a></span></span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Svc = #diameter_service{}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Opt = {raddr, <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','inet.html#type-ip_address');">inet:ip_address()</a></span>} | {rport, integer()} | term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Pid = pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">LAddr = <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','inet.html#type-ip_address');">inet:ip_address()</a></span></span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>
The start function required by <span class="bold_code"><a href="diameter_transport.html">diameter_transport(3)</a></span>.</p>
<p>
The only diameter_sctp-specific argument is the options list.
Options <span class="code">raddr</span> and <span class="code">rport</span> specify the remote address
and port for a connecting transport and not valid for a listening
transport: the former is required while latter defaults to 3868 if
unspecified.
More than one <span class="code">raddr</span> option can be specified, in which case the
connecting transport in question attempts each in sequence until
an association is established.
Remaining options are any accepted by <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','gen_sctp.html#open-1');">gen_sctp:open/1</a></span>, with the exception
of options <span class="code">mode</span>, <span class="code">binary</span>, <span class="code">list</span>, <span class="code">active</span>
and <span class="code">sctp_events</span>.
Note that options <span class="code">ip</span> and <span class="code">port</span> specify the local address
and port respectively.</p>
<p>
Multiple <span class="code">ip</span> options can be specified for a multihomed peer.
If none are specified then the values of <span class="code">Host-IP-Address</span>
in the <span class="code">#diameter_service{}</span> record are used.
(In particular, one of these must be specified.)
Option <span class="code">port</span> defaults to 3868 for a listening transport and 0 for a
connecting transport.</p>
<div class="warning">
<div class="label">Warning</div>
<div class="content"><p>
<p>
An insufficiently large receive buffer may result in a peer having to
resend incoming messages: set the <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','inet.html');">inet(3)</a></span> option <span class="code">recbuf</span> to increase
the buffer size.</p>
<p>
An insufficiently large send buffer may result in outgoing messages
being discarded: set the <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','inet.html');">inet(3)</a></span> option <span class="code">sndbuf</span> to increase
the buffer size.</p>
</p></div>
</div>
<p>
diameter_sctp uses the <span class="code">transport_data</span> field of
the <span class="code">#diameter_packet{}</span> record to communicate the stream on which an
inbound message has been received, or on which an outbound message
should be sent: the value will be of the form <span class="code">{stream, Id}</span>
on an inbound message passed to a <span class="bold_code"><a href="diameter_app.html#Mod:handle_request-3">handle_request/3</a></span> or
<span class="bold_code"><a href="diameter_app.html#Mod:handle_answer-4">handle_answer/4</a></span> callback.
For an outbound message, either <span class="code">undefined</span> (explicitly or
by receiving the outbound message as a <span class="code">binary()</span>) or a tuple
should be set in the return value of <span class="bold_code"><a href="diameter_app.html#Mod:handle_request-3">handle_request/3</a></span>
(typically by retaining the value passed into this function)
or <span class="bold_code"><a href="diameter_app.html#Mod:prepare_request-3">prepare_request/3</a></span>.
The value <span class="code">undefined</span> uses a "next outbound stream" id and
increments this modulo the total number outbound streams.
That is, successive values of <span class="code">undefined</span> cycle through all
outbound streams.</p>
</p></div>
<h3><a name="id79199">SEE ALSO</a></h3>
<div class="REFBODY">
<p>
<span class="bold_code"><a href="diameter.html">diameter(3)</a></span>, <span class="bold_code"><a href="diameter_transport.html">diameter_transport(3)</a></span>, <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','gen_sctp.html');">gen_sctp(3)</a></span>, <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','inet.html');">inet(3)</a></span></p>
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