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mosquitto.8.xml
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<?xml version='1.0' encoding='UTF-8'?>
<?xml-stylesheet type="text/xsl" href="manpage.xsl"?>
<refentry xml:id="mosquitto" xmlns:xlink="http://www.w3.org/1999/xlink">
<refmeta>
<refentrytitle>mosquitto</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="source">Mosquitto Project</refmiscinfo>
<refmiscinfo class="manual">System management commands</refmiscinfo>
</refmeta>
<refnamediv>
<refname>mosquitto</refname>
<refpurpose>an MQTT broker</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>mosquitto</command>
<arg>-c <replaceable>config file</replaceable></arg>
<group>
<arg choice='plain'>-d</arg>
<arg choice='plain'>--daemon</arg>
</group>
<arg>-p <replaceable>port number</replaceable></arg>
<arg>-v</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>mosquitto</command> is a broker for the MQTT protocol version 3.1.</para>
</refsect1>
<refsect1>
<title>Options</title>
<variablelist>
<varlistentry>
<term><option>-c</option></term>
<term><option>--config-file</option></term>
<listitem>
<para>Load configuration from a file. If not given, the default values as described in <citerefentry><refentrytitle>mosquitto.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> are used.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-d</option></term>
<term><option>--daemon</option></term>
<listitem>
<para>Run <command>mosquitto</command> in the background as a daemon. All other behaviour remains the same.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-p</option></term>
<term><option>--port</option></term>
<listitem>
<para>Listen on the port specified instead of the default 1883. This acts in addition to the port setting in the config file. May be specified multiple times to open multiple sockets listening on different ports. This socket will be bound to all network interfaces.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-v</option></term>
<term><option>--verbose</option></term>
<listitem>
<para>Use verbose logging. This is equivalent to setting
<option>log_type</option> to <option>all</option> in
the configuration file. This overrides and logging
options given in the configuration file.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Configuration</title>
<para>The broker can be configured using a configuration file as
described in
<citerefentry><refentrytitle>mosquitto.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
and this is the main point of information for mosquitto.
The files required for SSL/TLS support are described in
<citerefentry><refentrytitle>mosquitto-tls</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>Broker Status</title>
<para>Clients can find information about the broker by subscribing to
topics in the $SYS hierarchy as follows. Topics marked as static are
only sent once per client on subscription. All other topics are updated
every <option>sys_interval</option> seconds. If
<option>sys_interval</option> is 0, then updates are not sent.</para>
<para>Note that if you are using a command line client to interact with the
$SYS topics and your shell interprets $ as an environment variable,
you need to place the topic in single quotes '$SYS/...' or to
escape the dollar symbol: \$SYS/... otherwise the $SYS will be
treated as an environment variable.</para>
<variablelist>
<varlistentry>
<term><option>$SYS/broker/bytes/received</option></term>
<listitem>
<para>The total number of bytes received since the broker
started.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/bytes/sent</option></term>
<listitem>
<para>The total number of bytes sent since the broker
started.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/clients/connected</option></term>
<term><option>$SYS/broker/clients/active</option> (deprecated)</term>
<listitem>
<para>The number of currently connected clients.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/clients/expired</option></term>
<listitem>
<para>The number of disconnected persistent clients that
have been expired and removed through the
persistent_client_expiration option.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/clients/disconnected</option></term>
<term><option>$SYS/broker/clients/inactive</option> (deprecated)</term>
<listitem>
<para>The total number of persistent clients (with clean
session disabled) that are registered at the broker but are
currently disconnected.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/clients/maximum</option></term>
<listitem>
<para>The maximum number of clients that have been
connected to the broker at the same time.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/clients/total</option></term>
<listitem>
<para>The total number of active and inactive clients
currently connected and registered on the
broker.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/connection/#</option></term>
<listitem>
<para>When bridges are configured to/from the broker,
common practice is to provide a status topic that
indicates the state of the connection. This is provided
within $SYS/broker/connection/ by default. If the value
of the topic is 1 the connection is active, if 0 then
it is not active. See the Bridges section below for
more information on bridges.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/heap/current size</option></term>
<listitem>
<para>The current size of the heap memory in use by
mosquitto. Note that this topic may be unavailable
depending on compile time options.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/heap/maximum size</option></term>
<listitem>
<para>The largest amount of heap memory used by
mosquitto. Note that this topic may be unavailable
depending on compile time options.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/connections/+</option></term>
<listitem>
<para>The moving average of the number of CONNECT packets
received by the broker over different time intervals.
The final "+" of the hierarchy can be 1min, 5min or
15min. The value returned represents the number of
connections received in 1 minute, averaged over 1, 5 or
15 minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/bytes/received/+</option></term>
<listitem>
<para>The moving average of the number of bytes received by
the broker over different time intervals. The final "+"
of the hierarchy can be 1min, 5min or 15min. The value
returned represents the number of bytes received in 1
minute, averaged over 1, 5 or 15 minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/bytes/sent/+</option></term>
<listitem>
<para>The moving average of the number of bytes sent by the
broker over different time intervals. The final "+" of
the hierarchy can be 1min, 5min or 15min. The value
returned represents the number of bytes sent in 1
minute, averaged over 1, 5 or 15 minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/messages/received/+</option></term>
<listitem>
<para>The moving average of the number of all types of MQTT
messages received by the broker over different time
intervals. The final "+" of the hierarchy can be 1min,
5min or 15min. The value returned represents the number
of messages received in 1 minute, averaged over 1, 5 or
15 minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/messages/sent/+</option></term>
<listitem>
<para>The moving average of the number of all types of MQTT
messages sent by the broker over different time
intervals. The final "+" of the hierarchy can be 1min,
5min or 15min. The value returned represents the number
of messages send in 1 minute, averaged over 1, 5 or 15
minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/publish/dropped/+</option></term>
<listitem>
<para>The moving average of the number of publish messages
dropped by the broker over different time intervals.
This shows the rate at which durable clients that are
disconnected are losing messages. The final "+" of the
hierarchy can be 1min, 5min or 15min. The value
returned represents the number of messages dropped in 1
minute, averaged over 1, 5 or 15 minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/publish/received/+</option></term>
<listitem>
<para>The moving average of the number of publish messages
received by the broker over different time intervals.
The final "+" of the hierarchy can be 1min, 5min or
15min. The value returned represents the number of
publish messages received in 1 minute, averaged over 1,
5 or 15 minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/publish/sent/+</option></term>
<listitem>
<para>The moving average of the number of publish messages
sent by the broker over different time intervals. The
final "+" of the hierarchy can be 1min, 5min or 15min.
The value returned represents the number of publish
messages sent in 1 minute, averaged over 1, 5 or 15
minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/load/sockets/+</option></term>
<listitem>
<para>The moving average of the number of socket
connections opened to the broker over different time
intervals. The final "+" of the hierarchy can be 1min,
5min or 15min. The value returned represents the number
of socket connections in 1 minute, averaged over 1, 5
or 15 minutes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/messages/inflight</option></term>
<listitem>
<para>The number of messages with QoS>0 that are awaiting
acknowledgments.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/messages/received</option></term>
<listitem>
<para>The total number of messages of any type received since the broker started.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/messages/sent</option></term>
<listitem>
<para>The total number of messages of any type sent since the broker started.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/messages/stored</option></term>
<listitem>
<para>The number of messages currently held in the message
store. This includes retained messages and messages
queued for durable clients.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/publish/messages/dropped</option></term>
<listitem>
<para>The total number of publish messages that have been
dropped due to inflight/queuing limits. See the
max_inflight_messages and max_queued_messages options
in
<citerefentry><refentrytitle>mosquitto.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for more information.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/publish/messages/received</option></term>
<listitem>
<para>The total number of PUBLISH messages received since the broker started.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/publish/messages/sent</option></term>
<listitem>
<para>The total number of PUBLISH messages sent since the broker started.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/retained messages/count</option></term>
<listitem>
<para>The total number of retained messages active on the broker.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/subscriptions/count</option></term>
<listitem>
<para>The total number of subscriptions active on the broker.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/timestamp</option></term>
<listitem>
<para>The timestamp at which this particular build of the broker was made. Static.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/uptime</option></term>
<listitem>
<para>The amount of time in seconds the broker has been online.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>$SYS/broker/version</option></term>
<listitem>
<para>The version of the broker. Static.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Wildcard Topic Subscriptions</title>
<para>In addition to allowing clients to subscribe to specific topics,
mosquitto also allows the use of two wildcards in subscriptions.
<option>+</option> is the wildcard used to match a single level of
hierarchy. For example, for a topic of "a/b/c/d", the following example
subscriptions will match:</para>
<itemizedlist mark="circle">
<listitem><para>a/b/c/d</para></listitem>
<listitem><para>+/b/c/d</para></listitem>
<listitem><para>a/+/c/d</para></listitem>
<listitem><para>a/+/+/d</para></listitem>
<listitem><para>+/+/+/+</para></listitem>
</itemizedlist>
<para>The following subscriptions will not match:</para>
<itemizedlist mark="circle">
<listitem><para>a/b/c</para></listitem>
<listitem><para>b/+/c/d</para></listitem>
<listitem><para>+/+/+</para></listitem>
</itemizedlist>
<para>The second wildcard is <option>#</option> and is used to match
all subsequent levels of hierarchy. With a topic of "a/b/c/d", the
following example subscriptions will match:</para>
<itemizedlist mark="circle">
<listitem><para>a/b/c/d</para></listitem>
<listitem><para>#</para></listitem>
<listitem><para>a/#</para></listitem>
<listitem><para>a/b/#</para></listitem>
<listitem><para>a/b/c/#</para></listitem>
<listitem><para>+/b/c/#</para></listitem>
</itemizedlist>
<para>The $SYS hierarchy does not match a subscription of
"#". If you want to observe the entire $SYS hierarchy, subscribe to
$SYS/#.</para>
<para>Note that the wildcards must be only ever used on their own, so a
subscription of "a/b+/c" is not valid use of a wildcard. The
<option>#</option> wildcard must only ever be used as the final
character of a subscription.</para>
</refsect1>
<refsect1>
<title>Bridges</title>
<para>Multiple brokers can be connected together with the bridging
functionality. This is useful where it is desirable to share
information between locations, but where not all of the information
needs to be shared. An example could be where a number of users are
running a broker to help record power usage and for a number of other
reasons. The power usage could be shared through bridging all of the
user brokers to a common broker, allowing the power usage of all
users to be collected and compared. The other information would remain
local to each
broker.</para>
<para>For information on configuring bridges, see
<citerefentry><refentrytitle>mosquitto.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</refsect1>
<refsect1>
<title>Signals</title>
<variablelist>
<varlistentry>
<term>SIGHUP</term>
<listitem>
<para>Upon receiving the SIGHUP signal, mosquitto will
attempt to reload configuration file data, assuming that
the <option>-c</option> argument was provided when
mosquitto was started. Not all configuration parameters can
be reloaded without restarting. See
<citerefentry><refentrytitle>mosquitto.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>SIGUSR1</term>
<listitem>
<para>Upon receiving the SIGUSR1 signal, mosquitto will
write the persistence database to disk. This signal is only
acted upon if persistence is enabled.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>SIGUSR2</term>
<listitem>
<para>The SIGUSR2 signal causes mosquitto to print out the
current subscription tree, along with information about
where retained messages exist. This is intended as a
testing feature only and may be removed at any time.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Files</title>
<variablelist>
<varlistentry>
<term><filename>/etc/mosquitto/mosquitto.conf</filename></term>
<listitem>
<para>Configuration file. See <citerefentry><refentrytitle>mosquitto.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>/var/lib/mosquitto/mosquitto.db</filename></term>
<listitem>
<para>Persistent message data storage location if persist enabled.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>/etc/hosts.allow</filename></term>
<term><filename>/etc/hosts.deny</filename></term>
<listitem>
<para>Host access control via tcp-wrappers as described in <citerefentry><refentrytitle>hosts_access</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Bugs</title>
<para><command>mosquitto</command> bug information can be found at
<ulink url="https://github.com/eclipse/mosquitto/issues"/></para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member>
<citerefentry>
<refentrytitle><link xlink:href="mqtt-7.html">mqtt</link></refentrytitle>
<manvolnum>7</manvolnum>
</citerefentry>
</member>
<member>
<citerefentry>
<refentrytitle><link xlink:href="mosquitto-tls-7.html">mosquitto-tls</link></refentrytitle>
<manvolnum>7</manvolnum>
</citerefentry>
</member>
<member>
<citerefentry>
<refentrytitle><link xlink:href="mosquitto-conf-5.html">mosquitto.conf</link></refentrytitle>
<manvolnum>5</manvolnum>
</citerefentry>
</member>
<member>
<citerefentry>
<refentrytitle><link xlink:href="https://linux.die.net/man/5/hosts_access">hosts_access</link></refentrytitle>
<manvolnum>5</manvolnum>
</citerefentry>
</member>
<member>
<citerefentry>
<refentrytitle><link xlink:href="mosquitto_passwd-1.html">mosquitto_passwd</link></refentrytitle>
<manvolnum>1</manvolnum>
</citerefentry>
</member>
<member>
<citerefentry>
<refentrytitle><link xlink:href="mosquitto_pub-1.html">mosquitto_pub</link></refentrytitle>
<manvolnum>1</manvolnum>
</citerefentry>
</member>
<member>
<citerefentry>
<refentrytitle><link xlink:href="mosquitto_sub-1.html">mosquitto_sub</link></refentrytitle>
<manvolnum>1</manvolnum>
</citerefentry>
</member>
<member>
<citerefentry>
<refentrytitle><link xlink:href="libmosquitto-3.html">libmosquitto</link></refentrytitle>
<manvolnum>3</manvolnum>
</citerefentry>
</member>
</simplelist>
</refsect1>
<refsect1>
<title>Thanks</title>
<para>Thanks to Andy Stanford-Clark for being one of the people who
came up with MQTT in the first place. Thanks to Andy and Nicholas
O'Leary for providing clarifications of the protocol.</para>
<para>Thanks also to everybody at the Ubuntu UK Podcast and Linux
Outlaws for organising OggCamp, where Andy gave a talk that
inspired mosquitto.</para>
</refsect1>
<refsect1>
<title>Author</title>
<para>Roger Light <email>[email protected]</email></para>
</refsect1>
</refentry>