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<refentry xml:id="mosquitto_rr" xmlns:xlink="http://www.w3.org/1999/xlink">
	<refmeta>
		<refentrytitle>mosquitto_rr</refentrytitle>
		<manvolnum>1</manvolnum>
		<refmiscinfo class="source">Mosquitto Project</refmiscinfo>
		<refmiscinfo class="manual">Commands</refmiscinfo>
	</refmeta>

	<refnamediv>
		<refname>mosquitto_rr</refname>
		<refpurpose>an MQTT version 5/3.1.1 client for request/response messaging</refpurpose>
	</refnamediv>

	<refsynopsisdiv>
		<cmdsynopsis>
			<command>mosquitto_rr</command>
			<arg choice='plain'><option>-e</option> <replaceable>response-topic</replaceable></arg>
			<group choice='req'>
				<arg choice='plain'>
					<arg><option>-h</option> <replaceable>hostname</replaceable></arg>
					<arg><option>--unix</option> <replaceable>socket path</replaceable></arg>
					<arg><option>-p</option> <replaceable>port-number</replaceable></arg>
					<arg><option>-u</option> <replaceable>username</replaceable></arg>
					<arg><option>-P</option> <replaceable>password</replaceable></arg>
					<arg choice='plain' rep='repeat'><option>-t</option> <replaceable>message-topic</replaceable></arg>
				</arg>
				<arg choice='plain'>
					<arg choice='plain'><option>-L</option> <replaceable>URL</replaceable></arg>
					<arg choice='opt' rep='repeat'><option>-t</option> <replaceable>message-topic</replaceable></arg>
				</arg>
			</group>
			<group choice='req'>
				<arg choice='plain'><option>-f</option> <replaceable>file</replaceable></arg>
				<arg choice='plain'><option>-m</option> <replaceable>message</replaceable></arg>
				<arg choice='plain'><option>-n</option></arg>
				<arg choice='plain'><option>-s</option></arg>
			</group>
			<arg><option>-A</option> <replaceable>bind-address</replaceable></arg>
			<arg><option>-c</option></arg>
			<arg><option>-d</option></arg>
			<arg><option>-D</option> <replaceable>command</replaceable> <replaceable>identifier</replaceable> <replaceable>value</replaceable></arg>
			<arg><option>-i</option> <replaceable>client-id</replaceable></arg>
			<arg><option>-I</option> <replaceable>client-id-prefix</replaceable></arg>
			<arg><option>-k</option> <replaceable>keepalive-time</replaceable></arg>
			<arg><option>-N</option></arg>
			<arg><option>--nodelay</option></arg>
			<arg><option>--pretty</option></arg>
			<arg><option>-q</option> <replaceable>message-QoS</replaceable></arg>
			<arg><option>-R</option></arg>
			<arg><option>-S</option></arg>
			<arg><option>-v</option></arg>
			<arg><option>-V</option> <replaceable>protocol-version</replaceable></arg>
			<arg><option>-W</option> <replaceable>message-processing-timeout</replaceable></arg>
			<arg><option>-x</option> <replaceable>session-expiry-interval</replaceable></arg>
			<arg><option>--proxy</option> <replaceable>socks-url</replaceable></arg>
			<arg><option>--quiet</option></arg>
			<arg>
				<option>--will-topic</option> <replaceable>topic</replaceable>
				<arg><option>--will-payload</option> <replaceable>payload</replaceable></arg>
				<arg><option>--will-qos</option> <replaceable>qos</replaceable></arg>
				<arg><option>--will-retain</option></arg>
			</arg>
			<group>
				<arg>
					<group choice='req'>
						<arg choice='plain'><option>--cafile</option> <replaceable>file</replaceable></arg>
						<arg choice='plain'><option>--capath</option> <replaceable>dir</replaceable></arg>
					</group>
					<arg><option>--cert</option> <replaceable>file</replaceable></arg>
					<arg><option>--key</option> <replaceable>file</replaceable></arg>
					<arg><option>--ciphers</option> <replaceable>ciphers</replaceable></arg>
					<arg><option>--tls-version</option> <replaceable>version</replaceable></arg>
					<arg><option>--tls-alpn</option> <replaceable>protocol</replaceable></arg>
					<arg><option>--tls-engine</option> <replaceable>engine</replaceable></arg>
					<arg><option>--keyform</option>
					<group choice='req'>
						<arg choice='plain'><replaceable>pem</replaceable></arg>
						<arg choice='plain'><replaceable>engine</replaceable></arg>
					</group></arg>
					<arg><option>--tls-engine-kpass-sha1</option> <replaceable>kpass-sha1</replaceable></arg>
					<arg><option>--tls-use-os-certs</option></arg>
					<arg><option>--insecure</option></arg>
				</arg>
				<arg>
					<arg choice='plain'><option>--psk</option> <replaceable>hex-key</replaceable></arg>
					<arg choice='plain'><option>--psk-identity</option> <replaceable>identity</replaceable></arg>
					<arg><option>--ciphers</option> <replaceable>ciphers</replaceable></arg>
					<arg><option>--tls-version</option> <replaceable>version</replaceable></arg>
				</arg>
			</group>
		</cmdsynopsis>
		<cmdsynopsis>
			<command>mosquitto_rr</command>
			<group choice='plain'>
				<arg><option>--help</option></arg>
			</group>
		</cmdsynopsis>
	</refsynopsisdiv>

	<refsect1>
		<title>Description</title>
		<para><command>mosquitto_rr</command> is an MQTT version 5/3.1.1
			client that can be used to publish a request message and wait for a
			response. When using MQTT v5, which is the default,
			<command>mosquitto_rr</command> will use the Request-Response
			feature.</para>
		<para>The important options are <option>-t</option>, <option>-e</option>,
			and one of <option>-f</option>, <option>-m</option>, <option>-n</option>,
			and <option>-s</option>.</para>
		<para>Example: <code>mosquitto_rr -t request-topic -e response-topic -m message</code></para>
	</refsect1>

	<refsect1>
		<title>Encrypted Connections</title>
		<para><command>mosquitto_rr</command> supports TLS encrypted
			connections. It is strongly recommended that you use an encrypted
			connection for anything more than the most basic setup.</para>
		<para>To enable TLS connections when using x509 certificates, one of
			either <option>--cafile</option> or <option>--capath</option> can
			be provided as an option.</para>
		<para>Alternatively, if the <option>-p 8883</option> option is used
			then the OS provided certificates will be loaded and neither
			<option>--cafile</option> or <option>--capath</option> are
			needed</para>
		<para>To enable TLS connections when using TLS-PSK, you must use the
			<option>--psk</option> and the <option>--psk-identity</option>
			options.</para>
	</refsect1>

	<refsect1>
		<title>Options</title>
		<para>The options below may be given on the command line, but may also
			be placed in a config file located at
			<option>$XDG_CONFIG_HOME/mosquitto_rr</option> or
			<option>$HOME/.config/mosquitto_rr</option> with one pair of
			<option>-option <replaceable>value</replaceable></option>
			per line. The values in the config file will be used as defaults
			and can be overridden by using the command line. The exceptions to
			this is <option>-t</option>, which if given in the config file will
			not be overridden. Note also that currently some options cannot be
			negated, e.g. <option>-S</option>. Config file lines that have a
			<option>#</option> as the first character are treated as comments
			and not processed any further.</para>
		<variablelist>
			<varlistentry>
				<term><option>-A</option></term>
				<listitem>
					<para>Bind the outgoing connection to a local ip
						address/hostname. Use this argument if you need to
						restrict network communication to a particular
						interface.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-c</option></term>
				<term><option>--disable-clean-session</option></term>
				<listitem>
					<para>Disable 'clean session' / enable persistent client mode.
						When this argument is used, the broker will be instructed
						not to clean existing sessions for the same client id when
						the client connects, and sessions will never expire when
						the client disconnects. MQTT v5 clients can change their
						session expiry interval with the <option>-x</option> argument.
					</para>
					<para>When a session is persisted on the broker, the subscriptions
						for the client will be maintained after it disconnects, along
						with subsequent QoS 1 and QoS 2 messages that arrive. When the
						client reconnects and does not clean the session, it will
						receive all of the queued messages.</para>
					<para>If using this option, the client id must be set
						manually with <option>--id</option></para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--cafile</option></term>
				<listitem>
					<para>Define the path to a file containing PEM encoded CA
						certificates that are trusted. Used to enable SSL
						communication.</para>
					<para>See also <option>--capath</option></para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--capath</option></term>
				<listitem>
					<para>Define the path to a directory containing PEM encoded CA
						certificates that are trusted. Used to enable SSL
						communication.</para>
					<para>For <option>--capath</option> to work correctly, the
						certificate files must have ".crt" as the file ending
						and you must run "openssl rehash &lt;path to capath&gt;" each
						time you add/remove a certificate.</para>
					<para>See also <option>--cafile</option></para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--cert</option></term>
				<listitem>
					<para>Define the path to a file containing a PEM encoded
						certificate for this client, if required by the
						server.</para>
					<para>See also <option>--key</option> and the Encrypted Connections section.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--ciphers</option></term>
				<listitem>
					<para>An openssl compatible list of TLS ciphers to support
						in the client. See
						<citerefentry><refentrytitle><link xlink:href="https://linux.die.net/man/1/ciphers">ciphers</link></refentrytitle><manvolnum>1</manvolnum></citerefentry>
						for more information.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-d</option></term>
				<term><option>--debug</option></term>
				<listitem>
					<para>Enable debug messages.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-D</option></term>
				<term><option>--property</option></term>
				<listitem>
					<para>Use an MQTT v5 property with this publish. If you use
						this option, the client will be set to be an MQTT v5
						client. This option has two forms:</para>
					<para><option>-D command identifier value</option></para>
					<para><option>-D command identifier name value</option></para>
					<para><option>command</option> is the MQTT command/packet
						identifier and can be one of CONNECT, PUBACK, PUBREC,
						PUBCOMP, SUBSCRIBE, UNSUBSCRIBE, DISCONNECT, AUTH, or
						WILL. The properties available for each command are
						listed in the Properties section.</para>

					<para><option>identifier</option> is the name of the
						property to add. This is as described in the
						specification, but with '-' as a word separator. For
						example:
						<option>payload-format-indicator</option>. More details
						are in the <link linkend='properties'>Properties</link>
						section.</para>

					<para><option>value</option> is the value of the property
						to add, with a data type that is property
						specific.</para>

					<para><option>name</option> is only used for the
						<option>user-property</option> property as the first of
						the two strings in the string pair. In that case,
						<option>value</option> is the second of the strings in
						the pair.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-e</option></term>
				<listitem>
					<para>Response topic. The client will subscribe to this topic to wait for a response.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-f</option></term>
				<term><option>--file</option></term>
				<listitem>
					<para>Send the contents of a file as the request message.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-F</option></term>
				<listitem>
					<para>Specify output printing format. This option allows
						you to choose what information from each message is
						printed to the screen. See the <link
							linkend='outputformat'>Output Format</link> section
						below for full details.</para>
					<para>This option overrides the <option>-v</option> option,
						but does not override the <option>-N</option>
						option.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--help</option></term>
				<listitem>
					<para>Display usage information.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-h</option></term>
				<term><option>--host</option></term>
				<listitem>
					<para>Specify the host to connect to. Defaults to localhost.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-i</option></term>
				<term><option>--id</option></term>
				<listitem>
					<para>The id to use for this client. If not given, a client id will
					be generated depending on the MQTT version being used. For v3.1.1/v3.1,
					the client generates a client id in the format
					<option>mosq-XXXXXXXXXXXXXXXXXX</option>, where the
					<option>X</option> are replaced with random alphanumeric
					characters. For v5.0, the client sends a zero length client id, and the
					server will generate a client id for the client.</para>

					<para>This option cannot be used at the same time as the
					<option>--id-prefix</option> argument.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-I</option></term>
				<term><option>--id-prefix</option></term>
				<listitem>
					<para>Provide a prefix that the client id will be built
					from by appending the process id of the client. This is
					useful where the broker is using the clientid_prefixes
					option. Cannot be used at the same time as the
					<option>--id</option> argument.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--insecure</option></term>
				<listitem>
					<para>When using certificate based encryption, this option
						disables verification of the server hostname in the
						server certificate. This can be useful when testing
						initial server configurations but makes it possible for
						a malicious third party to impersonate your server
						through DNS spoofing, for example. Use this option in
						testing <emphasis>only</emphasis>. If you need to
						resort to using this option in a production
						environment, your setup is at fault and there is no
						point using encryption.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-k</option></term>
				<term><option>--keepalive</option></term>
				<listitem>
					<para>The number of seconds between sending PING commands
					to the broker for the purposes of informing it we are still
					connected and functioning. Defaults to 60 seconds.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--key</option></term>
				<listitem>
					<para>Define the path to a file containing a PEM encoded
						private key for this client, if required by the
						server.</para>
					<para>See also <option>--cert</option> and the Encrypted Connections section.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--keyform</option></term>
				<listitem>
					<para>Specifies the type of private key in use when making
						TLS connections.. This can be "pem" or "engine". This
						parameter is useful when a TPM module is being used and
						the private key has been created with it. Defaults to
						"pem", which means normal private key files are
						used.</para>
					<para>See also <option>--tls-engine</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-L</option></term>
				<term><option>--url</option></term>
				<listitem>
					<para>Specify specify user, password, hostname, port and
						topic at once as a URL.  The URL must be in the form:
						mqtt(s)://[username[:password]@]host[:port]/topic</para>
					<para>If the scheme is mqtt:// then the port defaults to
						1883. If the scheme is mqtts:// then the port defaults
						to 8883.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-m</option></term>
				<term><option>--message</option></term>
				<listitem>
					<para>Send a single request message from the command line.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-N</option></term>
				<listitem>
					<para>Do not append an end of line character to the payload
						when printing. This allows streaming of payload data
						from multiple messages directly to another application
						unmodified. Only really makes sense when not using
						<option>-v</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-n</option></term>
				<term><option>--null-message</option></term>
				<listitem>
					<para>Send a null (zero length) request message.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--nodelay</option></term>
				<listitem>
					<para>Disable Nagle's algorithm for the socket. This means
						that latency of sent messages is reduced, which is
						particularly noticeable for small, reasonably infrequent
						messages. Using this option may result in more packets
						being sent than would normally be necessary.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-p</option></term>
				<term><option>--port</option></term>
				<listitem>
					<para>Connect to the port specified. If not given, the
						default of 1883 for plain MQTT or 8883 for MQTT over
						TLS will be used.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-P</option></term>
				<term><option>--pw</option></term>
				<listitem>
					<para>Provide a password to be used for authenticating with
						the broker. Using this argument without also specifying
						a username is invalid when using MQTT v3.1 or v3.1.1.
						See also the <option>--username</option> option.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--pretty</option></term>
				<listitem>
                    <para>
						When using the JSON output format %j or %J, the default
						is to print in an unformatted fashion. Specifying
						<option>--pretty</option> prints messages in a prettier,
						more human readable format.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--proxy</option></term>
				<listitem>
					<para>Specify a SOCKS5 proxy to connect through. "None" and
						"username" authentication types are supported. The
						<option>socks-url</option> must be of the form
						<option>socks5h://[username[:password]@]host[:port]</option>.
						The protocol prefix <option>socks5h</option> means that
						hostnames are resolved by the proxy. The symbols %25,
						%3A and %40 are URL decoded into %, : and @
						respectively, if present in the username or
						password.</para>
					<para>If username is not given, then no authentication is
						attempted. If the port is not given, then the default
						of 1080 is used.</para>
					<para>More SOCKS versions may be available in the future,
						depending on demand, and will use different protocol
						prefixes as described in <citerefentry>
							<refentrytitle><link xlink:href="https://linux.die.net/man/1/curl">curl</link></refentrytitle>
							<manvolnum>1</manvolnum> </citerefentry>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--psk</option></term>
				<listitem>
					<para>Provide the hexadecimal (no leading 0x)
						pre-shared-key matching the one used on the broker to
						use TLS-PSK encryption support.
						<option>--psk-identity</option> must also be provided
						to enable TLS-PSK.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--psk-identity</option></term>
				<listitem>
					<para>The client identity to use with TLS-PSK support. This
						may be used instead of a username if the broker is
						configured to do so.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-q</option></term>
				<term><option>--qos</option></term>
				<listitem>
					<para>Specify the quality of service desired for the
					incoming messages, from 0, 1 and 2. Defaults to 0. See
					<citerefentry><refentrytitle><link xlink:href="mqtt-7.html">mqtt</link></refentrytitle><manvolnum>7</manvolnum></citerefentry>
					for more information on QoS.</para>
					<para>The QoS is identical for all topics subscribed to in
					a single instance of mosquitto_rr.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--quiet</option></term>
				<listitem>
					<para>If this argument is given, no runtime errors will be
					printed. This excludes any error messages given in case of
					invalid user input (e.g. using <option>--port</option> without a
					port).</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-R</option></term>
				<listitem>
					<para>If this argument is given, messages that are received
						that have the retain bit set will not be printed.
						Messages with retain set are "stale", in that it is not
						known when they were originally published. When
						subscribing to a wildcard topic there may be a large
						number of retained messages. This argument suppresses
						their display.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-S</option></term>
				<listitem>
					<para>Use SRV lookups to determine which host to connect
						to. Performs lookups to
						<option>_mqtt._tcp.&lt;host&gt;</option> when used in
						conjunction with <option>-h</option>, otherwise uses
						<option>_mqtt._tcp.&lt;local dns
							domain&gt;</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-s</option></term>
				<term><option>--stdin-file</option></term>
				<listitem>
					<para>Send a request message read from stdin, sending the entire content as a single message.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-t</option></term>
				<term><option>--topic</option></term>
				<listitem>
					<para>The MQTT topic where the request message will be sent.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--tls-alpn</option></term>
				<listitem>
					<para>Provide a protocol to use when connecting to a broker
						that has multiple protocols available on a single port,
						e.g. MQTT and WebSockets.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--tls-engine</option></term>
				<listitem>
					<para>A valid openssl engine id. These can be listed with
						openssl engine command.</para>
					<para>See also <option>--keyform</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--tls-engine-kpass-sha1</option></term>
				<listitem>
					<para>SHA1 of the private key password when using an TLS
						engine.  Some TLS engines such as the TPM engine may
						require the use of a password in order to be accessed.
						This option allows a hex encoded SHA1 hash of the
						password to the engine directly, instead of the user
						being prompted for the password.</para>
					<para>See also <option>--tls-engine</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--tls-use-os-certs</option></term>
				<listitem>
                    <para>
                        If used, this will load and trust the OS provided CA
                        certificates. This can be used in conjunction with
                        <option>--cafile</option> and <option>--capath</option>
                        and can be used on its own to enable TLS mode. This
						will be set by default if <option>-L mqtts://...</option>
                        is used, or if port is 8883 and no other certificate
                        options are used.
					</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--tls-version</option></term>
				<listitem>
					<para>Choose which TLS protocol version to use when
						communicating with the broker. Valid options are
						<option>tlsv1.3</option>, <option>tlsv1.2</option> and
						<option>tlsv1.1</option>. The default value is
						<option>tlsv1.2</option>. Must match the protocol
						version used by the broker.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-u</option></term>
				<term><option>--username</option></term>
				<listitem>
					<para>Provide a username to be used for authenticating with
						the broker. See also the <option>--pw</option>
						argument.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--unix</option></term>
				<listitem>
					<para>Connect to a broker through a local unix domain socket
						instead of a TCP socket. This is a replacement for
						<option>-h</option> and <option>-L</option>. For example:
						<option>mosquitto_pub --unix /tmp/mosquitto.sock ...</option>
					</para>
					<para>See the <option>socket_domain</option> option in
						<refentrytitle>
							<link xlink:href="mosquitto-conf-5.html">mosquitto.conf</link>
						</refentrytitle><manvolnum>5</manvolnum>
						to configure Mosquitto to listen on a unix socket.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-v</option></term>
				<term><option>--verbose</option></term>
				<listitem>
					<para>Print received messages verbosely. With this
					argument, messages will be printed as "topic payload". When
					this argument is not given, the messages are printed as
					"payload".</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-V</option></term>
				<term><option>--protocol-version</option></term>
				<listitem>
					<para>Specify which version of the MQTT protocol should be
						used when connecting to the rmeote broker. Can be
						<option>5</option>, <option>311</option>,
						<option>31</option>, or the more verbose
						<option>mqttv5</option>, <option>mqttv311</option>, or
						<option>mqttv31</option>.
						Defaults to <option>5</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-W</option></term>
				<listitem>
					<para>Provide a timeout as an integer number of seconds.
						mosquitto_sub will stop processing messages and
						disconnect after this number of seconds has
						passed. The timeout starts just after the client has
						connected to the broker.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--will-payload</option></term>
				<listitem>
					<para>Specify a message that will be stored by the broker
					and sent out if this client disconnects unexpectedly. This
					must be used in conjunction with <option>--will-topic</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--will-qos</option></term>
				<listitem>
					<para>The QoS to use for the Will. Defaults to 0. This must
					be used in conjunction with <option>--will-topic</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--will-retain</option></term>
				<listitem>
					<para>If given, if the client disconnects unexpectedly the
					message sent out will be treated as a retained message.
					This must be used in conjunction with <option>--will-topic</option>.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>--will-topic</option></term>
				<listitem>
					<para>The topic on which to send a Will, in the event that
					the client disconnects unexpectedly.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><option>-x</option></term>
				<listitem>
					<para>Set the session-expiry-interval property on the CONNECT packet.
						Applies to MQTT v5 clients only. Set to 0-4294967294 to specify
						the session will expire in that many seconds after the client
						disconnects, or use -1, 4294967295, or ∞ for a session that does
						not expire. Defaults to -1 if -c is also given, or 0 if -c not
						given.</para>
					<para>If the session is set to never expire, either with -x or -c, then
						a client id must be provided.</para>
				</listitem>
			</varlistentry>
		</variablelist>
	</refsect1>

	<refsect1 id='outputformat'>
		<title>Output format</title>
		<para>There are three ways of formatting the output from mosquitto_rr.
			In all cases a new-line character is appended for each message
			received unless the <option>-N</option> argument is passed to
			mosquitto_rr.</para>
		<para>Payload-only is the default output format and will
			print the payload exactly as it is received.</para>
		<para>Verbose mode is activated with <option>-v</option> and prints the
			message topic and the payload, separated by a space.</para>
		<para>The final option is formatted output, which allows the user to
			define a custom output format.  The behaviour is controlled with
			the <option>-F format-string</option> option. The format string is
			a free text string where interpreted sequences are replaced by
			different parameters. The available interpreted sequences are
			described below.</para>
		<para>Three characters are used to start an interpreted sequence:
			<option>%</option>, <option>@</option> and <option>\</option>.
			Sequences starting with <option>%</option> are either parameters
			related to the MQTT message being printed, or are helper sequences
			to avoid the need to type long date format strings for example.
			Sequences starting with <option>@</option> are passed to the
			<citerefentry><refentrytitle><link xlink:href="https://linux.die.net/man/3/strftime">strftime</link></refentrytitle><manvolnum>3</manvolnum></citerefentry>
			function (with the @ replaced with a % - note that only the
			character immediately after the @ is passed to strftime). This
			allows the construction of a wide variety of time based outputs.
			The output options for strftime vary from platform to platform, so
			please check what is available for your platform. mosquitto_rr
			does provide one extension to strftime which is
			<option>@N</option>, which can be used to obtain the number of
			nanoseconds passed in the current second. The resolution of this
			option varies depending on the platform. The final sequence
			character is <option>\</option>, which is used to input some
			characters that would otherwise be difficult to enter.</para>

		<refsect2>
			<title>MQTT related parameters</title>
			<itemizedlist mark="circle">
				<listitem><para><option>%%</option> a literal %.</para></listitem>
				<listitem><para><option>%A</option> the MQTT v5 topic-alias property, if present.</para></listitem>
				<listitem><para><option>%C</option> the MQTT v5 content-type property, if present.</para></listitem>
				<listitem><para><option>%D</option> the MQTT v5 correlation-data property, if present. Note that this
						property is specified as binary data, so may produce non-printable characters.</para></listitem>
				<listitem><para><option>%E</option> the MQTT v5 message-expiry-interval property, if present.</para></listitem>
				<listitem><para><option>%F</option> the MQTT v5 payload-format-indicator property, if present.</para></listitem>
				<listitem><para><option>%l</option> the length of the payload in bytes.</para></listitem>
				<listitem><para><option>%m</option> the message id (only relevant for messages with QoS>0).</para></listitem>
				<listitem><para><option>%P</option> the MQTT v5 user-property property, if present. This will be printed in the
						form key:value. It is possible for any number of user properties to be attached to a message, and to
						have duplicate keys.</para></listitem>
				<listitem><para><option>%p</option> the payload raw bytes (may produce non-printable characters depending on the payload).</para></listitem>
				<listitem><para><option>%q</option> the message QoS.</para></listitem>
				<listitem><para><option>%R</option> the MQTT v5 response-topic property, if present.</para></listitem>
				<listitem><para><option>%r</option> the retained flag for the message.</para></listitem>
				<listitem><para><option>%S</option> the MQTT v5 subscription-identifier property, if present.</para></listitem>
				<listitem><para><option>%t</option> the message topic.</para></listitem>
				<listitem><para><option>%x</option> the payload with each byte as a hexadecimal number (lower case).</para></listitem>
				<listitem><para><option>%X</option> the payload with each byte as a hexadecimal number (upper case).</para></listitem>
			</itemizedlist>
		</refsect2>

		<refsect2>
			<title>Helpers</title>
			<itemizedlist mark="circle">
				<listitem><para><option>%I</option> ISO-8601 format date and time, e.g. 2016-08-10T09:47:38+0100</para></listitem>
				<listitem><para><option>%j</option> JSON output of message
						parameters and timestamp, with a quoted and escaped
						payload. For example
						<code>{"tst":"2020-05-06T22:12:00.000000+0100","topic":"greeting","qos":0,"retain":0,"payload":"hello
							world"}</code></para></listitem>
				<listitem><para><option>%J</option> JSON output of message
						parameters and timestamp, with a non-quoted and
						non-escaped payload - this means the payload must
						itself be valid JSON. For example:
						<code>{"tst":"2020-05-06T22:12:00.000000+0100","topic":"foo","qos":0,"retain":0,"payload":{"temperature":27.0,"humidity":57}}</code>.</para>
					<para>If the payload is not valid JSON, then the error message "Error: Message payload is not valid JSON on topic
						&lt;topic&gt;" will be printed to stderr.</para></listitem>
				<listitem><para><option>%I</option> ISO-8601 format date and time, e.g. 2016-08-10T09:47:38+0100</para></listitem>
				<listitem><para><option>%U</option> Unix timestamp with nanoseconds, e.g. 1470818943.786368637</para></listitem>
			</itemizedlist>
		</refsect2>

		<refsect2>
			<title>Time related parameters</title>
			<itemizedlist mark="circle">
				<listitem><para><option>@@</option> a literal @.</para></listitem>
				<listitem><para><option>@X</option> pass the character represented
						by <option>X</option> to the strftime function as
						<option>%X</option>. The options supported are platform
						dependent.</para></listitem>
				<listitem><para><option>@N</option> the number of nanoseconds that
						have passed in the current second, with varying timing
						resolution depending on platform.</para></listitem>
			</itemizedlist>
		</refsect2>

		<refsect2>
			<title>Escape characters</title>
			<itemizedlist mark="circle">
				<listitem><para><option>\\</option> a literal \.</para></listitem>
				<listitem><para><option>\0</option> a null character. Can be used
						to separate different parameters that may contain spaces
						(e.g. topic, payload) so that processing with tools such as
						<citerefentry><refentrytitle><link xlink:href="https://linux.die.net/man/1/xargs">xargs</link></refentrytitle><manvolnum>1</manvolnum></citerefentry>
						is easier.</para></listitem>
				<listitem><para><option>\a</option> alert/bell.</para></listitem>
				<listitem><para><option>\e</option> the escape sequence, which can
						be used with ANSI colour codes to provide coloured output
						for example.</para></listitem>
				<listitem><para><option>\n</option> end of line.</para></listitem>
				<listitem><para><option>\r</option> carriage return.</para></listitem>
				<listitem><para><option>\t</option> horizontal tab.</para></listitem>
				<listitem><para><option>\v</option> vertical tab.</para></listitem>
			</itemizedlist>
		</refsect2>
	</refsect1>

	<refsect1>
		<title>Wills</title>
		<para>mosquitto_rr can register a message with the broker that will be
		sent out if it disconnects unexpectedly. See
		<citerefentry><refentrytitle><link xlink:href="mqtt-7.html">mqtt</link></refentrytitle><manvolnum>7</manvolnum></citerefentry>
		for more information.</para>
		<para>The minimum requirement for this is to use <option>--will-topic</option> to
		specify which topic the will should be sent out on. This will result in
		a non-retained, zero length message with QoS 0.</para>
		<para>Use the <option>--will-retain</option>, <option>--will-payload</option> and <option>--will-qos</option> arguments to
		modify the other will parameters.</para>
	</refsect1>

	<refsect1 id='properties'>
		<title>Properties</title>
		<para>The <option>-D</option> / <option>--property</option> option
			allows adding properties to different stages of the mosquitto_rr
			run. The properties supported for each command are as
			follows:</para>

		<refsect2>
			<title>Connect</title>
			<itemizedlist>
				<listitem><para><option>authentication-data</option> (binary data - note treated as a string in mosquitto_rr)</para></listitem>
				<listitem><para><option>authentication-method</option> (UTF-8 string pair)</para></listitem>
				<listitem><para><option>maximum-packet-size</option> (32-bit unsigned integer)</para></listitem>
				<listitem><para><option>receive-maximum</option> (16-bit unsigned integer)</para></listitem>
				<listitem><para><option>request-problem-information</option> (8-bit unsigned integer)</para></listitem>
				<listitem><para><option>request-response-information</option> (8-bit unsigned integer)</para></listitem>
				<listitem><para><option>session-expiry-interval</option> (32-bit unsigned integer, note use <option>-x</option> instead)</para></listitem>
				<listitem><para><option>topic-alias-maximum</option> (16-bit unsigned integer)</para></listitem>
				<listitem><para><option>user-property</option> (UTF-8 string pair)</para></listitem>
			</itemizedlist>
		</refsect2>

		<refsect2>
			<title>Publish</title>
			<itemizedlist>
				<listitem><para><option>content-type</option> (UTF-8 string)</para></listitem>
				<listitem><para><option>correlation-data</option> (binary data - note treated as a string in mosquitto_rr)</para></listitem>
				<listitem><para><option>message-expiry-interval</option> (32-bit unsigned integer)</para></listitem>
				<listitem><para><option>payload-format-indicator</option> (8-bit unsigned integer)</para></listitem>
				<listitem><para><option>response-topic</option> (UTF-8 string)</para></listitem>
				<listitem><para><option>topic-alias</option> (16-bit unsigned integer)</para></listitem>
				<listitem><para><option>user-property</option> (UTF-8 string pair)</para></listitem>
			</itemizedlist>
		</refsect2>

		<refsect2>
			<title>Subscribe</title>
			<itemizedlist>
				<listitem><para><option>user-property</option> (UTF-8 string pair)</para></listitem>
			</itemizedlist>
		</refsect2>

		<refsect2>
			<title>Unsubscribe</title>
			<itemizedlist>
				<listitem><para><option>user-property</option> (UTF-8 string pair)</para></listitem>
			</itemizedlist>
		</refsect2>

		<refsect2>
			<title>Disconnect</title>
			<itemizedlist>
				<listitem><para><option>session-expiry-interval</option> (32-bit unsigned integer)</para></listitem>
				<listitem><para><option>user-property</option> (UTF-8 string pair)</para></listitem>
			</itemizedlist>
		</refsect2>

		<refsect2>
			<title>Will properties</title>
			<itemizedlist>
				<listitem><para><option>content-type</option> (UTF-8 string)</para></listitem>
				<listitem><para><option>correlation-data</option> (binary data - note treated as a string in mosquitto_pub)</para></listitem>
				<listitem><para><option>message-expiry-interval</option> (32-bit unsigned integer)</para></listitem>
				<listitem><para><option>payload-format-indicator</option> (8-bit unsigned integer)</para></listitem>
				<listitem><para><option>response-topic</option> (UTF-8 string)</para></listitem>
				<listitem><para><option>user-property</option> (UTF-8 string pair)</para></listitem>
				<listitem><para><option>will-delay-interval</option> (32-bit unsigned integer)</para></listitem>
			</itemizedlist>
		</refsect2>
	</refsect1>

	<refsect1>
		<title>Exit Values</title>
		<variablelist>
			<varlistentry>
				<term><option>0</option></term>
				<listitem><para>Success</para></listitem>
			</varlistentry>
			<varlistentry>
				<term><option>27</option></term>
				<listitem><para>Timed out waiting for message</para></listitem>
			</varlistentry>
			<varlistentry>
				<term><option>Other non-zero value</option></term>
				<listitem><para>Unspecified failure</para></listitem>
			</varlistentry>
		</variablelist>
	</refsect1>

	<refsect1>
		<title>Files</title>
		<variablelist>
			<varlistentry>
				<term><filename>$XDG_CONFIG_HOME/mosquitto_rr</filename></term>
				<term><filename>$HOME/.config/mosquitto_rr</filename></term>
				<term><filename>$HOME/snap/mosquitto/current/.config/mosquitto_rr</filename> (for snap installs)</term>
				<listitem>
					<para>Configuration file for default options.</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_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="mosquitto-8.html">mosquitto</link></refentrytitle>
					<manvolnum>8</manvolnum>
				</citerefentry>
			</member>
			<member>
				<citerefentry>
					<refentrytitle><link xlink:href="libmosquitto-3.html">libmosquitto</link></refentrytitle>
					<manvolnum>3</manvolnum>
				</citerefentry>
			</member>
			<member>
				<citerefentry>
					<refentrytitle><link xlink:href="mosquitto-tls-7.html">mosquitto-tls</link></refentrytitle>
					<manvolnum>7</manvolnum>
				</citerefentry>
			</member>
		</simplelist>
	</refsect1>

	<refsect1>
		<title>Author</title>
		<para>Roger Light <email>roger@atchoo.org</email></para>
	</refsect1>
</refentry>
