path: root/lib/megaco/doc/src/megaco_tcp.xml

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<!DOCTYPE erlref SYSTEM "erlref.dtd">

<erlref>
  <header>
    <copyright>
      <year>2000</year><year>2009</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
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      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights and limitations
      under the License.
    
    </legalnotice>

    <title>megaco_tcp</title>
    <prepared>Lars Thors&eacute;n</prepared>
    <responsible>Lars Thors&eacute;n</responsible>
    <docno></docno>
    <approved>Lars Thors&eacute;n</approved>
    <checked></checked>
    <date>2007-06-15</date>
    <rev>%VSN%</rev>
    <file>megaco_tcp.xml</file>
  </header>
  <module>megaco_tcp</module>
  <modulesummary>Interface module to TPKT transport protocol for Megaco/H.248.</modulesummary>
  <description>
    <p>This module contains the public interface to the TPKT (TCP/IP) version
      transport protocol for Megaco/H.248.</p>
  </description>
  <funcs>
    <func>
      <name>start_transport() -> {ok, TransportRef}</name>
      <fsummary></fsummary>
      <type>
        <v>TransportRef = pid()</v>
      </type>
      <desc>
        <p>This function is used for starting the TCP/IP transport service.
          Use exit(TransportRef, Reason) to stop the transport service.</p>
      </desc>
    </func>
    <func>
      <name>listen(TransportRef, ListenPortSpecList) -> ok</name>
      <fsummary></fsummary>
      <type>
        <v>TransportRef = pid() | regname()</v>
        <v>OptionListPerPort = [Option]</v>
        <v>Option = {port, integer()} |{options, list()} |{receive_handle, term()}</v>
      </type>
      <desc>
        <p>This function is used for starting new TPKT listening socket
          for TCP/IP.  The option list contains the socket
          definitions.</p>
      </desc>
    </func>
    <func>
      <name>connect(TransportRef, OptionList) -> {ok, Handle, ControlPid} |  {error, Reason}</name>
      <fsummary></fsummary>
      <type>
        <v>TransportRef = pid() | regname()</v>
        <v>OptionList = [Option]</v>
        <v>Option = {host, Ipaddr} | {port, integer()}  |{options, list()} |{receive_handle, term()} |{module, atom()}</v>
        <v>Handle = socket_handle()</v>
        <v>ControlPid = pid()</v>
        <v>Reason = term()</v>
      </type>
      <desc>
        <p>This function is used to open a TPKT connection.</p>
        <p>The <c><![CDATA[module]]></c> option makes it possible for the user to provide
          their own callback module. The <c><![CDATA[receive_message/4]]></c> or
          <c><![CDATA[process_received_message/4]]></c> functions of this module is called 
          when a new message is received (which one depends on the size of the 
          message; small - receive_message, large - process_received_message). 
          Default value is <em>megaco</em>.</p>
      </desc>
    </func>
    <func>
      <name>close(Handle) -> ok</name>
      <fsummary></fsummary>
      <type>
        <v>Handle = socket_handle()</v>
      </type>
      <desc>
        <p>This function is used for closing an active TPKT connection.</p>
      </desc>
    </func>
    <func>
      <name>socket(Handle) -> Socket</name>
      <fsummary></fsummary>
      <type>
        <v>Handle = socket_handle()</v>
        <v>Socket = inet_socket()</v>
      </type>
      <desc>
        <p>This function is used to convert a socket_handle() to
          a inet_socket(). inet_socket() is a plain socket,
          see the inet module for more info.</p>
      </desc>
    </func>
    <func>
      <name>send_message(Handle, Message) -> ok</name>
      <fsummary></fsummary>
      <type>
        <v>Handle = socket_handle()</v>
        <v>Message = binary() | iolist()</v>
      </type>
      <desc>
        <p>Sends a message on a connection.</p>
      </desc>
    </func>
    <func>
      <name>block(Handle) -> ok</name>
      <fsummary></fsummary>
      <type>
        <v>Handle = socket_handle()</v>
      </type>
      <desc>
        <p>Stop receiving incoming messages on the socket.</p>
      </desc>
    </func>
    <func>
      <name>unblock(Handle) -> ok</name>
      <fsummary></fsummary>
      <type>
        <v>Handle = socket_handle()</v>
      </type>
      <desc>
        <p>Starting to receive incoming messages from the socket again.</p>
        <marker id="upgrade_receive_handle"></marker>
      </desc>
    </func>
    <func>
      <name>upgrade_receive_handle(ControlPid) -> ok</name>
      <fsummary></fsummary>
      <type>
        <v>ControlPid = pid()</v>
      </type>
      <desc>
        <p>Update the receive handle of the control process (e.g. after
          having changed protocol version).</p>
        <marker id="stats"></marker>
      </desc>
    </func>
    <func>
      <name>get_stats() -> {ok, TotalStats} | {error, Reason}</name>
      <name>get_stats(SendHandle) -> {ok, SendHandleStats} | {error, Reason}</name>
      <name>get_stats(SendHandle, Counter) -> {ok, CounterStats} | {error, Reason}</name>
      <fsummary></fsummary>
      <type>
        <v>TotalStats = [send_handle_stats()]</v>
        <v>total_stats() = {send_handle(), [stats()]}</v>
        <v>SendHandle = send_handle()</v>
        <v>SendHandleStats = [stats()]</v>
        <v>Counter = tcp_stats_counter()</v>
        <v>CounterStats = integer()</v>
        <v>stats() = {tcp_stats_counter(), integer()}</v>
        <v>tcp_stats_counter() = medGwyGatewayNumInMessages |  medGwyGatewayNumInOctets | medGwyGatewayNumOutMessages | medGwyGatewayNumOutOctets | medGwyGatewayNumErrors</v>
        <v>Reason = term()</v>
      </type>
      <desc>
        <p>Retreive the TCP related (SNMP) statistics counters.</p>
      </desc>
    </func>
    <func>
      <name>reset_stats() -> void()</name>
      <name>reset_stats(SendHandle) -> void()</name>
      <fsummary></fsummary>
      <type>
        <v>SendHandle = send_handle()</v>
      </type>
      <desc>
        <p>Reset all TCP related (SNMP) statistics counters.</p>
      </desc>
    </func>
  </funcs>

</erlref>