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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2000</year><year>2016</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
</legalnotice>
<title>megaco_udp</title>
<prepared>Lars Thorsén</prepared>
<responsible>Lars Thorsén</responsible>
<docno></docno>
<approved>Lars Thorsén</approved>
<checked></checked>
<date>2007-06-15</date>
<rev>%VSN%</rev>
<file>megaco_udp.xml</file>
</header>
<module since="">megaco_udp</module>
<modulesummary>Interface module to UDP transport protocol for Megaco/H.248.</modulesummary>
<description>
<p>This module contains the public interface to the UDP/IP version
transport protocol for Megaco/H.248.</p>
</description>
<funcs>
<func>
<name since="">start_transport() -> {ok, TransportRef}</name>
<fsummary></fsummary>
<type>
<v>TransportRef = pid()</v>
</type>
<desc>
<p>This function is used for starting the UDP/IP transport service.
Use exit(TransportRef, Reason) to stop the transport service.</p>
</desc>
</func>
<func>
<name since="">open(TransportRef, OptionList) -> {ok, Handle, ControlPid} | {error, Reason}</name>
<fsummary></fsummary>
<type>
<v>TransportRef = pid() | regname()</v>
<v>OptionList = [option()]</v>
<v>option() = {port, integer()} |{options, list()} |{receive_handle, receive_handle()} |{module, atom()}</v>
<v>Handle = socket_handle()</v>
<v>receive_handle() = term()</v>
<v>ControlPid = pid()</v>
<v>Reason = term()</v>
</type>
<desc>
<p>This function is used to open an UDP/IP socket.</p>
<p>The <c><![CDATA[module]]></c> option makes it possible for the user to provide
their own callback module. The functions <c><![CDATA[receive_message/4]]></c> or
<c><![CDATA[process_received_message/4]]></c> 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 since="">close(Handle, Msg) -> ok</name>
<fsummary></fsummary>
<type>
<v>Handle = socket_handle()</v>
<v>Msg</v>
</type>
<desc>
<p>This function is used for closing an active UDP socket.</p>
</desc>
</func>
<func>
<name since="">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 since="">create_send_handle(Handle, Host, Port) -> send_handle()</name>
<fsummary></fsummary>
<type>
<v>Handle = socket_handle()</v>
<v>Host = {A,B,C,D} | string()</v>
<v>Port = integer()</v>
</type>
<desc>
<p>Creates a send handle from a transport handle. The send
handle is intended to be used by megaco_udp:send_message/2.</p>
</desc>
</func>
<func>
<name since="">send_message(SendHandle, Msg) -> ok</name>
<fsummary></fsummary>
<type>
<v>SendHandle = send_handle()</v>
<v>Message = binary() | iolist()</v>
</type>
<desc>
<p>Sends a message on a socket. The send handle is obtained by
megaco_udp:create_send_handle/3. Increments the NumOutMessages
and NumOutOctets counters if message successfully sent. In case
of a failure to send, the NumErrors counter is <em>not</em>
incremented. This is done elsewhere in the megaco app.</p>
</desc>
</func>
<func>
<name since="">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 since="">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 since="">upgrade_receive_handle(ControlPid, NewHandle) -> ok</name>
<fsummary></fsummary>
<type>
<v>ControlPid = pid()</v>
<v>NewHandle = receive_handle()</v>
<v>receive_handle() = term()</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 since="">get_stats() -> {ok, TotalStats} | {error, Reason}</name>
<name since="">get_stats(SendHandle) -> {ok, SendHandleStats} | {error, Reason}</name>
<name since="">get_stats(SendHandle, Counter) -> {ok, CounterStats} | {error, Reason}</name>
<fsummary></fsummary>
<type>
<v>TotalStats = [total_stats()]</v>
<v>total_stats() = {send_handle(), [stats()]}</v>
<v>SendHandle = send_handle()</v>
<v>SendHandleStats = [stats()]</v>
<v>Counter = udp_stats_counter()</v>
<v>CounterStats = integer()</v>
<v>stats() = {udp_stats_counter(), integer()}</v>
<v>tcp_stats_counter() = medGwyGatewayNumInMessages | medGwyGatewayNumInOctets | medGwyGatewayNumOutMessages | medGwyGatewayNumOutOctets | medGwyGatewayNumErrors</v>
<v>Reason = term()</v>
</type>
<desc>
<p>Retreive the UDP related (SNMP) statistics counters.</p>
</desc>
</func>
<func>
<name since="">reset_stats() -> void()</name>
<name since="">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>
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