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mosquitto.conf

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+# Config file for mosquitto
+#
+# See mosquitto.conf(5) for more information.
+#
+# Default values are shown, uncomment to change.
+#
+# Use the # character to indicate a comment, but only if it is the 
+# very first character on the line.
+
+# =================================================================
+# General configuration
+# =================================================================
+
+# Time in seconds to wait before resending an outgoing QoS=1 or 
+# QoS=2 message.
+#retry_interval 20
+
+# Time in seconds between updates of the $SYS tree.
+# Set to 0 to disable the publishing of the $SYS tree.
+#sys_interval 10
+
+# Time in seconds between cleaning the internal message store of 
+# unreferenced messages. Lower values will result in lower memory 
+# usage but more processor time, higher values will have the 
+# opposite effect.
+# Setting a value of 0 means the unreferenced messages will be 
+# disposed of as quickly as possible.
+#store_clean_interval 10
+
+# Write process id to a file. Default is a blank string which means 
+# a pid file shouldn't be written.
+# This should be set to /var/run/mosquitto.pid if mosquitto is
+# being run automatically on boot with an init script and 
+# start-stop-daemon or similar.
+#pid_file
+
+# When run as root, drop privileges to this user and its primary 
+# group.
+# Leave blank to stay as root, but this is not recommended.
+# If run as a non-root user, this setting has no effect.
+# Note that on Windows this has no effect and so mosquitto should 
+# be started by the user you wish it to run as.
+#user mosquitto
+
+# The maximum number of QoS 1 and 2 messages currently inflight per 
+# client.
+# This includes messages that are partway through handshakes and 
+# those that are being retried. Defaults to 20. Set to 0 for no 
+# maximum. Setting to 1 will guarantee in-order delivery of QoS 1 
+# and 2 messages.
+#max_inflight_messages 20
+
+# The maximum number of QoS 1 and 2 messages to hold in a queue 
+# above those that are currently in-flight.  Defaults to 100. Set 
+# to 0 for no maximum (not recommended).
+# See also queue_qos0_messages.
+#max_queued_messages 100
+
+# Set to true to queue messages with QoS 0 when a persistent client is
+# disconnected. These messages are included in the limit imposed by
+# max_queued_messages.
+# Defaults to false.
+# This is a non-standard option for the MQTT v3.1 spec but is allowed in
+# v3.1.1.
+#queue_qos0_messages false
+
+# This option sets the maximum publish payload size that the broker will allow.
+# Received messages that exceed this size will not be accepted by the broker.
+# The default value is 0, which means that all valid MQTT messages are
+# accepted. MQTT imposes a maximum payload size of 268435455 bytes. 
+#message_size_limit 0
+
+# This option controls whether a client is allowed to connect with a zero
+# length client id or not. This option only affects clients using MQTT v3.1.1
+# and later. If set to false, clients connecting with a zero length client id
+# are disconnected. If set to true, clients will be allocated a client id by
+# the broker. This means it is only useful for clients with clean session set
+# to true.
+#allow_zero_length_clientid true
+
+# If allow_zero_length_clientid is true, this option allows you to set a prefix
+# to automatically generated client ids to aid visibility in logs.
+#auto_id_prefix
+
+# This option allows persistent clients (those with clean session set to false)
+# to be removed if they do not reconnect within a certain time frame.
+#
+# This is a non-standard option in MQTT V3.1 but allowed in MQTT v3.1.1.
+#
+# Badly designed clients may set clean session to false whilst using a randomly
+# generated client id. This leads to persistent clients that will never
+# reconnect. This option allows these clients to be removed.
+#
+# The expiration period should be an integer followed by one of h d w m y for
+# hour, day, week, month and year respectively. For example
+#
+# persistent_client_expiration 2m
+# persistent_client_expiration 14d
+# persistent_client_expiration 1y
+#
+# The default if not set is to never expire persistent clients.
+#persistent_client_expiration
+
+# If a client is subscribed to multiple subscriptions that overlap, e.g. foo/#
+# and foo/+/baz , then MQTT expects that when the broker receives a message on
+# a topic that matches both subscriptions, such as foo/bar/baz, then the client
+# should only receive the message once.
+# Mosquitto keeps track of which clients a message has been sent to in order to
+# meet this requirement. The allow_duplicate_messages option allows this
+# behaviour to be disabled, which may be useful if you have a large number of
+# clients subscribed to the same set of topics and are very concerned about
+# minimising memory usage.
+# It can be safely set to true if you know in advance that your clients will
+# never have overlapping subscriptions, otherwise your clients must be able to
+# correctly deal with duplicate messages even when then have QoS=2.
+#allow_duplicate_messages false
+
+# The MQTT specification requires that the QoS of a message delivered to a
+# subscriber is never upgraded to match the QoS of the subscription. Enabling
+# this option changes this behaviour. If upgrade_outgoing_qos is set true,
+# messages sent to a subscriber will always match the QoS of its subscription.
+# This is a non-standard option explicitly disallowed by the spec.
+#upgrade_outgoing_qos false
+
+# This option affects the scenario when a client subscribes to a topic that has
+# retained messages. It is possible that the client that published the retained
+# message to the topic had access at the time they published, but that access
+# has been subsequently removed. If check_retain_source is set to true, the
+# default, the source of a retained message will be checked for access rights
+# before it is republished. When set to false, no check will be made and the
+# retained message will always be published. This affects all listeners.
+#check_retain_source true
+
+# =================================================================
+# Default listener
+# =================================================================
+
+# IP address/hostname to bind the default listener to. If not
+# given, the default listener will not be bound to a specific 
+# address and so will be accessible to all network interfaces.
+# bind_address ip-address/host name
+#bind_address
+
+# Port to use for the default listener.
+port 1883
+
+# The maximum number of client connections to allow. This is 
+# a per listener setting.
+# Default is -1, which means unlimited connections.
+# Note that other process limits mean that unlimited connections 
+# are not really possible. Typically the default maximum number of 
+# connections possible is around 1024.
+#max_connections -1
+
+# Choose the protocol to use when listening.
+# This can be either mqtt or websockets.
+# Websockets support is currently disabled by default at compile time.
+# Certificate based TLS may be used with websockets, except that
+# only the cafile, certfile, keyfile and ciphers options are supported.
+protocol mqtt
+
+# When a listener is using the websockets protocol, it is possible to serve
+# http data as well. Set http_dir to a directory which contains the files you
+# wish to serve. If this option is not specified, then no normal http
+# connections will be possible.
+#http_dir
+
+# Set use_username_as_clientid to true to replace the clientid that a client
+# connected with with its username. This allows authentication to be tied to
+# the clientid, which means that it is possible to prevent one client
+# disconnecting another by using the same clientid.
+# If a client connects with no username it will be disconnected as not
+# authorised when this option is set to true.
+# Do not use in conjunction with clientid_prefixes.
+# See also use_identity_as_username.
+#use_username_as_clientid
+
+# -----------------------------------------------------------------
+# Certificate based SSL/TLS support
+# -----------------------------------------------------------------
+# The following options can be used to enable SSL/TLS support for 
+# this listener. Note that the recommended port for MQTT over TLS
+# is 8883, but this must be set manually.
+#
+# See also the mosquitto-tls man page.
+
+# At least one of cafile or capath must be defined. They both 
+# define methods of accessing the PEM encoded Certificate 
+# Authority certificates that have signed your server certificate 
+# and that you wish to trust.
+# cafile defines the path to a file containing the CA certificates.
+# capath defines a directory that will be searched for files
+# containing the CA certificates. For capath to work correctly, the
+# certificate files must have ".crt" as the file ending and you must run
+# "openssl rehash <path to capath>" each time you add/remove a certificate.
+#cafile
+#capath
+
+# Path to the PEM encoded server certificate.
+#certfile
+
+# Path to the PEM encoded keyfile.
+#keyfile
+
+# This option defines the version of the TLS protocol to use for this listener.
+# The default value allows v1.2, v1.1 and v1.0, if they are all supported by
+# the version of openssl that the broker was compiled against. For openssl >=
+# 1.0.1 the valid values are tlsv1.2 tlsv1.1 and tlsv1. For openssl < 1.0.1 the
+# valid values are tlsv1.
+#tls_version
+
+# By default a TLS enabled listener will operate in a similar fashion to a
+# https enabled web server, in that the server has a certificate signed by a CA
+# and the client will verify that it is a trusted certificate. The overall aim
+# is encryption of the network traffic. By setting require_certificate to true,
+# the client must provide a valid certificate in order for the network
+# connection to proceed. This allows access to the broker to be controlled
+# outside of the mechanisms provided by MQTT.
+#require_certificate false
+
+# If require_certificate is true, you may set use_identity_as_username to true
+# to use the CN value from the client certificate as a username. If this is
+# true, the password_file option will not be used for this listener.
+#use_identity_as_username false
+
+# If you have require_certificate set to true, you can create a certificate
+# revocation list file to revoke access to particular client certificates. If
+# you have done this, use crlfile to point to the PEM encoded revocation file.
+#crlfile
+
+# If you wish to control which encryption ciphers are used, use the ciphers
+# option. The list of available ciphers can be obtained using the "openssl
+# ciphers" command and should be provided in the same format as the output of
+# that command.
+# If unset defaults to DEFAULT:!aNULL:!eNULL:!LOW:!EXPORT:!SSLv2:@STRENGTH
+#ciphers DEFAULT:!aNULL:!eNULL:!LOW:!EXPORT:!SSLv2:@STRENGTH
+
+# -----------------------------------------------------------------
+# Pre-shared-key based SSL/TLS support
+# -----------------------------------------------------------------
+# The following options can be used to enable PSK based SSL/TLS support for
+# this listener. Note that the recommended port for MQTT over TLS is 8883, but
+# this must be set manually.
+#
+# See also the mosquitto-tls man page and the "Certificate based SSL/TLS
+# support" section. Only one of certificate or PSK encryption support can be
+# enabled for any listener.
+
+# The psk_hint option enables pre-shared-key support for this listener and also
+# acts as an identifier for this listener. The hint is sent to clients and may
+# be used locally to aid authentication. The hint is a free form string that
+# doesn't have much meaning in itself, so feel free to be creative.
+# If this option is provided, see psk_file to define the pre-shared keys to be
+# used or create a security plugin to handle them.
+#psk_hint
+
+# Set use_identity_as_username to have the psk identity sent by the client used
+# as its username. Authentication will be carried out using the PSK rather than
+# the MQTT username/password and so password_file will not be used for this
+# listener.
+#use_identity_as_username false
+
+# When using PSK, the encryption ciphers used will be chosen from the list of
+# available PSK ciphers. If you want to control which ciphers are available,
+# use the "ciphers" option.  The list of available ciphers can be obtained
+# using the "openssl ciphers" command and should be provided in the same format
+# as the output of that command.
+#ciphers
+
+# =================================================================
+# Extra listeners
+# =================================================================
+
+# Listen on a port/ip address combination. By using this variable 
+# multiple times, mosquitto can listen on more than one port. If 
+# this variable is used and neither bind_address nor port given, 
+# then the default listener will not be started.
+# The port number to listen on must be given. Optionally, an ip 
+# address or host name may be supplied as a second argument. In 
+# this case, mosquitto will attempt to bind the listener to that 
+# address and so restrict access to the associated network and 
+# interface. By default, mosquitto will listen on all interfaces.
+# Note that for a websockets listener it is not possible to bind to a host
+# name.
+# listener port-number [ip address/host name]
+listener 8080
+
+# The maximum number of client connections to allow. This is 
+# a per listener setting.
+# Default is -1, which means unlimited connections.
+# Note that other process limits mean that unlimited connections 
+# are not really possible. Typically the default maximum number of 
+# connections possible is around 1024.
+#max_connections -1
+
+# The listener can be restricted to operating within a topic hierarchy using
+# the mount_point option. This is achieved be prefixing the mount_point string
+# to all topics for any clients connected to this listener. This prefixing only
+# happens internally to the broker; the client will not see the prefix.
+#mount_point
+
+# Choose the protocol to use when listening.
+# This can be either mqtt or websockets.
+# Certificate based TLS may be used with websockets, except that only the
+# cafile, certfile, keyfile and ciphers options are supported.
+protocol websockets
+
+# When a listener is using the websockets protocol, it is possible to serve
+# http data as well. Set http_dir to a directory which contains the files you
+# wish to serve. If this option is not specified, then no normal http
+# connections will be possible.
+#http_dir
+
+# Set use_username_as_clientid to true to replace the clientid that a client
+# connected with with its username. This allows authentication to be tied to
+# the clientid, which means that it is possible to prevent one client
+# disconnecting another by using the same clientid.
+# If a client connects with no username it will be disconnected as not
+# authorised when this option is set to true.
+# Do not use in conjunction with clientid_prefixes.
+# See also use_identity_as_username.
+#use_username_as_clientid
+
+# -----------------------------------------------------------------
+# Certificate based SSL/TLS support
+# -----------------------------------------------------------------
+# The following options can be used to enable certificate based SSL/TLS support
+# for this listener. Note that the recommended port for MQTT over TLS is 8883,
+# but this must be set manually.
+#
+# See also the mosquitto-tls man page and the "Pre-shared-key based SSL/TLS
+# support" section. Only one of certificate or PSK encryption support can be
+# enabled for any listener.
+
+# At least one of cafile or capath must be defined to enable certificate based
+# TLS encryption. They both define methods of accessing the PEM encoded
+# Certificate Authority certificates that have signed your server certificate
+# and that you wish to trust.
+# cafile defines the path to a file containing the CA certificates.
+# capath defines a directory that will be searched for files
+# containing the CA certificates. For capath to work correctly, the
+# certificate files must have ".crt" as the file ending and you must run
+# "openssl rehash <path to capath>" each time you add/remove a certificate.
+#cafile
+#capath
+
+# Path to the PEM encoded server certificate.
+#certfile
+
+# Path to the PEM encoded keyfile.
+#keyfile
+
+# By default an TLS enabled listener will operate in a similar fashion to a
+# https enabled web server, in that the server has a certificate signed by a CA
+# and the client will verify that it is a trusted certificate. The overall aim
+# is encryption of the network traffic. By setting require_certificate to true,
+# the client must provide a valid certificate in order for the network
+# connection to proceed. This allows access to the broker to be controlled
+# outside of the mechanisms provided by MQTT.
+#require_certificate false
+
+# If require_certificate is true, you may set use_identity_as_username to true
+# to use the CN value from the client certificate as a username. If this is
+# true, the password_file option will not be used for this listener.
+#use_identity_as_username false
+
+# If you have require_certificate set to true, you can create a certificate
+# revocation list file to revoke access to particular client certificates. If
+# you have done this, use crlfile to point to the PEM encoded revocation file.
+#crlfile
+
+# If you wish to control which encryption ciphers are used, use the ciphers
+# option. The list of available ciphers can be optained using the "openssl
+# ciphers" command and should be provided in the same format as the output of
+# that command.
+#ciphers
+
+# -----------------------------------------------------------------
+# Pre-shared-key based SSL/TLS support
+# -----------------------------------------------------------------
+# The following options can be used to enable PSK based SSL/TLS support for
+# this listener. Note that the recommended port for MQTT over TLS is 8883, but
+# this must be set manually.
+#
+# See also the mosquitto-tls man page and the "Certificate based SSL/TLS
+# support" section. Only one of certificate or PSK encryption support can be
+# enabled for any listener.
+
+# The psk_hint option enables pre-shared-key support for this listener and also
+# acts as an identifier for this listener. The hint is sent to clients and may
+# be used locally to aid authentication. The hint is a free form string that
+# doesn't have much meaning in itself, so feel free to be creative.
+# If this option is provided, see psk_file to define the pre-shared keys to be
+# used or create a security plugin to handle them.
+#psk_hint
+
+# Set use_identity_as_username to have the psk identity sent by the client used
+# as its username. Authentication will be carried out using the PSK rather than
+# the MQTT username/password and so password_file will not be used for this
+# listener.
+#use_identity_as_username false
+
+# When using PSK, the encryption ciphers used will be chosen from the list of
+# available PSK ciphers. If you want to control which ciphers are available,
+# use the "ciphers" option.  The list of available ciphers can be optained
+# using the "openssl ciphers" command and should be provided in the same format
+# as the output of that command.
+#ciphers
+
+# =================================================================
+# Persistence
+# =================================================================
+
+# If persistence is enabled, save the in-memory database to disk 
+# every autosave_interval seconds. If set to 0, the persistence 
+# database will only be written when mosquitto exits. See also
+# autosave_on_changes.
+# Note that writing of the persistence database can be forced by 
+# sending mosquitto a SIGUSR1 signal.
+#autosave_interval 1800
+
+# If true, mosquitto will count the number of subscription changes, retained
+# messages received and queued messages and if the total exceeds
+# autosave_interval then the in-memory database will be saved to disk.
+# If false, mosquitto will save the in-memory database to disk by treating
+# autosave_interval as a time in seconds.
+#autosave_on_changes false
+
+# Save persistent message data to disk (true/false).
+# This saves information about all messages, including 
+# subscriptions, currently in-flight messages and retained 
+# messages.
+# retained_persistence is a synonym for this option.
+#persistence false
+
+# The filename to use for the persistent database, not including 
+# the path.
+#persistence_file mosquitto.db
+
+# Location for persistent database. Must include trailing /
+# Default is an empty string (current directory).
+# Set to e.g. /var/lib/mosquitto/ if running as a proper service on Linux or
+# similar.
+#persistence_location
+
+# =================================================================
+# Logging
+# =================================================================
+
+# Places to log to. Use multiple log_dest lines for multiple 
+# logging destinations.
+# Possible destinations are: stdout stderr syslog topic file
+#
+# stdout and stderr log to the console on the named output.
+#
+# syslog uses the userspace syslog facility which usually ends up 
+# in /var/log/messages or similar.
+#
+# topic logs to the broker topic '$SYS/broker/log/<severity>', 
+# where severity is one of D, E, W, N, I, M which are debug, error, 
+# warning, notice, information and message. Message type severity is used by
+# the subscribe/unsubscribe log_types and publishes log messages to
+# $SYS/broker/log/M/susbcribe or $SYS/broker/log/M/unsubscribe.
+#
+# The file destination requires an additional parameter which is the file to be
+# logged to, e.g. "log_dest file /var/log/mosquitto.log". The file will be
+# closed and reopened when the broker receives a HUP signal. Only a single file
+# destination may be configured.
+#
+# Note that if the broker is running as a Windows service it will default to
+# "log_dest none" and neither stdout nor stderr logging is available.
+# Use "log_dest none" if you wish to disable logging.
+#log_dest stderr
+
+# If using syslog logging (not on Windows), messages will be logged to the
+# "daemon" facility by default. Use the log_facility option to choose which of
+# local0 to local7 to log to instead. The option value should be an integer
+# value, e.g. "log_facility 5" to use local5.
+#log_facility
+
+# Types of messages to log. Use multiple log_type lines for logging
+# multiple types of messages.
+# Possible types are: debug, error, warning, notice, information, 
+# none, subscribe, unsubscribe, websockets, all.
+# Note that debug type messages are for decoding the incoming/outgoing
+# network packets. They are not logged in "topics".
+#log_type error
+#log_type warning
+#log_type notice
+#log_type information
+
+# Change the websockets logging level. This is a global option, it is not
+# possible to set per listener. This is an integer that is interpreted by
+# libwebsockets as a bit mask for its lws_log_levels enum. See the
+# libwebsockets documentation for more details. "log_type websockets" must also
+# be enabled.
+#websockets_log_level 0
+
+# If set to true, client connection and disconnection messages will be included
+# in the log.
+#connection_messages true
+
+# If set to true, add a timestamp value to each log message.
+#log_timestamp true
+
+# =================================================================
+# Security
+# =================================================================
+
+# If set, only clients that have a matching prefix on their 
+# clientid will be allowed to connect to the broker. By default, 
+# all clients may connect.
+# For example, setting "secure-" here would mean a client "secure-
+# client" could connect but another with clientid "mqtt" couldn't.
+#clientid_prefixes
+
+# Boolean value that determines whether clients that connect 
+# without providing a username are allowed to connect. If set to 
+# false then a password file should be created (see the 
+# password_file option) to control authenticated client access. 
+# Defaults to true.
+allow_anonymous false
+
+# In addition to the clientid_prefixes, allow_anonymous and TLS 
+# authentication options, username based authentication is also 
+# possible. The default support is described in "Default 
+# authentication and topic access control" below. The auth_plugin 
+# allows another authentication method to be used.
+# Specify the path to the loadable plugin and see the 
+# "Authentication and topic access plugin options" section below.
+#auth_plugin
+
+# If auth_plugin_deny_special_chars is true, the default, then before an ACL
+# check is made, the username/client id of the client needing the check is
+# searched for the presence of either a '+' or '#' character. If either of
+# these characters is found in either the username or client id, then the ACL
+# check is denied before it is sent to the plugin.o
+#
+# This check prevents the case where a malicious user could circumvent an ACL
+# check by using one of these characters as their username or client id. This
+# is the same issue as was reported with mosquitto itself as CVE-2017-7650.
+#
+# If you are entirely sure that the plugin you are using is not vulnerable to
+# this attack (i.e. if you never use usernames or client ids in topics) then
+# you can disable this extra check and have all ACL checks delivered to your
+# plugin by setting auth_plugin_deny_special_chars to false.
+#auth_plugin_deny_special_chars true
+
+# -----------------------------------------------------------------
+# Default authentication and topic access control
+# -----------------------------------------------------------------
+
+# Control access to the broker using a password file. This file can be
+# generated using the mosquitto_passwd utility. If TLS support is not compiled
+# into mosquitto (it is recommended that TLS support should be included) then
+# plain text passwords are used, in which case the file should be a text file
+# with lines in the format:
+# username:password
+# The password (and colon) may be omitted if desired, although this 
+# offers very little in the way of security.
+# 
+# See the TLS client require_certificate and use_identity_as_username options
+# for alternative authentication options.
+#password_file
+
+# Access may also be controlled using a pre-shared-key file. This requires
+# TLS-PSK support and a listener configured to use it. The file should be text
+# lines in the format:
+# identity:key
+# The key should be in hexadecimal format without a leading "0x".
+#psk_file
+
+# Control access to topics on the broker using an access control list
+# file. If this parameter is defined then only the topics listed will
+# have access.
+# If the first character of a line of the ACL file is a # it is treated as a
+# comment.
+# Topic access is added with lines of the format:
+#
+# topic [read|write|readwrite] <topic>
+# 
+# The access type is controlled using "read", "write" or "readwrite". This
+# parameter is optional (unless <topic> contains a space character) - if not
+# given then the access is read/write.  <topic> can contain the + or #
+# wildcards as in subscriptions.
+# 
+# The first set of topics are applied to anonymous clients, assuming
+# allow_anonymous is true. User specific topic ACLs are added after a 
+# user line as follows:
+#
+# user <username>
+#
+# The username referred to here is the same as in password_file. It is
+# not the clientid.
+#
+#
+# If is also possible to define ACLs based on pattern substitution within the
+# topic. The patterns available for substition are:
+#
+# %c to match the client id of the client
+# %u to match the username of the client
+#
+# The substitution pattern must be the only text for that level of hierarchy.
+#
+# The form is the same as for the topic keyword, but using pattern as the
+# keyword.
+# Pattern ACLs apply to all users even if the "user" keyword has previously
+# been given.
+#
+# If using bridges with usernames and ACLs, connection messages can be allowed
+# with the following pattern:
+# pattern write $SYS/broker/connection/%c/state
+#
+# pattern [read|write|readwrite] <topic>
+#
+# Example:
+#
+# pattern write sensor/%u/data
+#
+#acl_file
+
+# -----------------------------------------------------------------
+# Authentication and topic access plugin options
+# -----------------------------------------------------------------
+
+# If the auth_plugin option above is used, define options to pass to the
+# plugin here as described by the plugin instructions. All options named
+# using the format auth_opt_* will be passed to the plugin, for example:
+#
+# auth_opt_db_host
+# auth_opt_db_port 
+# auth_opt_db_username
+# auth_opt_db_password
+
+
+# =================================================================
+# Bridges
+# =================================================================
+
+# A bridge is a way of connecting multiple MQTT brokers together.
+# Create a new bridge using the "connection" option as described below. Set
+# options for the bridges using the remaining parameters. You must specify the
+# address and at least one topic to subscribe to.
+# Each connection must have a unique name.
+# The address line may have multiple host address and ports specified. See
+# below in the round_robin description for more details on bridge behaviour if
+# multiple addresses are used.
+# The direction that the topic will be shared can be chosen by 
+# specifying out, in or both, where the default value is out. 
+# The QoS level of the bridged communication can be specified with the next
+# topic option. The default QoS level is 0, to change the QoS the topic
+# direction must also be given.
+# The local and remote prefix options allow a topic to be remapped when it is
+# bridged to/from the remote broker. This provides the ability to place a topic
+# tree in an appropriate location. 
+# For more details see the mosquitto.conf man page.
+# Multiple topics can be specified per connection, but be careful 
+# not to create any loops.
+# If you are using bridges with cleansession set to false (the default), then
+# you may get unexpected behaviour from incoming topics if you change what
+# topics you are subscribing to. This is because the remote broker keeps the
+# subscription for the old topic. If you have this problem, connect your bridge
+# with cleansession set to true, then reconnect with cleansession set to false
+# as normal.
+#connection <name>
+#address <host>[:<port>] [<host>[:<port>]]
+#topic <topic> [[[out | in | both] qos-level] local-prefix remote-prefix]
+
+# Set the version of the MQTT protocol to use with for this bridge. Can be one
+# of mqttv31 or mqttv311. Defaults to mqttv31.
+#bridge_protocol_version mqttv31
+
+# If a bridge has topics that have "out" direction, the default behaviour is to
+# send an unsubscribe request to the remote broker on that topic. This means
+# that changing a topic direction from "in" to "out" will not keep receiving
+# incoming messages. Sending these unsubscribe requests is not always
+# desirable, setting bridge_attempt_unsubscribe to false will disable sending
+# the unsubscribe request.
+#bridge_attempt_unsubscribe true
+
+# If the bridge has more than one address given in the address/addresses
+# configuration, the round_robin option defines the behaviour of the bridge on
+# a failure of the bridge connection. If round_robin is false, the default
+# value, then the first address is treated as the main bridge connection. If
+# the connection fails, the other secondary addresses will be attempted in
+# turn. Whilst connected to a secondary bridge, the bridge will periodically
+# attempt to reconnect to the main bridge until successful.
+# If round_robin is true, then all addresses are treated as equals. If a
+# connection fails, the next address will be tried and if successful will
+# remain connected until it fails
+#round_robin false
+
+# Set the client id to use on the remote end of this bridge connection. If not
+# defined, this defaults to 'name.hostname' where name is the connection name
+# and hostname is the hostname of this computer.
+# This replaces the old "clientid" option to avoid confusion. "clientid"
+# remains valid for the time being.
+#remote_clientid
+
+# Set the clientid to use on the local broker. If not defined, this defaults to
+# 'local.<clientid>'. If you are bridging a broker to itself, it is important
+# that local_clientid and clientid do not match.
+#local_clientid
+
+# Set the clean session variable for this bridge.
+# When set to true, when the bridge disconnects for any reason, all 
+# messages and subscriptions will be cleaned up on the remote 
+# broker. Note that with cleansession set to true, there may be a 
+# significant amount of retained messages sent when the bridge 
+# reconnects after losing its connection.
+# When set to false, the subscriptions and messages are kept on the 
+# remote broker, and delivered when the bridge reconnects.
+#cleansession false
+
+# If set to true, publish notification messages to the local and remote brokers
+# giving information about the state of the bridge connection. Retained
+# messages are published to the topic $SYS/broker/connection/<clientid>/state
+# unless the notification_topic option is used.
+# If the message is 1 then the connection is active, or 0 if the connection has
+# failed.
+#notifications true
+
+# Choose the topic on which notification messages for this bridge are
+# published. If not set, messages are published on the topic
+# $SYS/broker/connection/<clientid>/state
+#notification_topic 
+
+# Set the keepalive interval for this bridge connection, in 
+# seconds.
+#keepalive_interval 60
+
+# Set the start type of the bridge. This controls how the bridge starts and
+# can be one of three types: automatic, lazy and once. Note that RSMB provides
+# a fourth start type "manual" which isn't currently supported by mosquitto.
+#
+# "automatic" is the default start type and means that the bridge connection
+# will be started automatically when the broker starts and also restarted
+# after a short delay (30 seconds) if the connection fails.
+#
+# Bridges using the "lazy" start type will be started automatically when the
+# number of queued messages exceeds the number set with the "threshold"
+# parameter. It will be stopped automatically after the time set by the
+# "idle_timeout" parameter. Use this start type if you wish the connection to
+# only be active when it is needed.
+#
+# A bridge using the "once" start type will be started automatically when the
+# broker starts but will not be restarted if the connection fails.
+#start_type automatic
+
+# Set the amount of time a bridge using the automatic start type will wait
+# until attempting to reconnect.  Defaults to 30 seconds.
+#restart_timeout 30
+
+# Set the amount of time a bridge using the lazy start type must be idle before
+# it will be stopped. Defaults to 60 seconds.
+#idle_timeout 60
+
+# Set the number of messages that need to be queued for a bridge with lazy
+# start type to be restarted. Defaults to 10 messages.
+# Must be less than max_queued_messages.
+#threshold 10
+
+# If try_private is set to true, the bridge will attempt to indicate to the
+# remote broker that it is a bridge not an ordinary client. If successful, this
+# means that loop detection will be more effective and that retained messages
+# will be propagated correctly. Not all brokers support this feature so it may
+# be necessary to set try_private to false if your bridge does not connect
+# properly.
+#try_private true
+
+# Set the username to use when connecting to a broker that requires
+# authentication.
+# This replaces the old "username" option to avoid confusion. "username"
+# remains valid for the time being.
+#remote_username
+
+# Set the password to use when connecting to a broker that requires
+# authentication. This option is only used if remote_username is also set.
+# This replaces the old "password" option to avoid confusion. "password"
+# remains valid for the time being.
+#remote_password
+
+# -----------------------------------------------------------------
+# Certificate based SSL/TLS support
+# -----------------------------------------------------------------
+# Either bridge_cafile or bridge_capath must be defined to enable TLS support
+# for this bridge.
+# bridge_cafile defines the path to a file containing the
+# Certificate Authority certificates that have signed the remote broker
+# certificate.
+# bridge_capath defines a directory that will be searched for files containing
+# the CA certificates. For bridge_capath to work correctly, the certificate
+# files must have ".crt" as the file ending and you must run "openssl rehash <path to
+# capath>" each time you add/remove a certificate.
+#bridge_cafile
+#bridge_capath
+
+# Path to the PEM encoded client certificate, if required by the remote broker.
+#bridge_certfile
+
+# Path to the PEM encoded client private key, if required by the remote broker.
+#bridge_keyfile
+
+# When using certificate based encryption, bridge_insecure 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 only. 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.
+#bridge_insecure false
+
+# -----------------------------------------------------------------
+# PSK based SSL/TLS support
+# -----------------------------------------------------------------
+# Pre-shared-key encryption provides an alternative to certificate based
+# encryption. A bridge can be configured to use PSK with the bridge_identity
+# and bridge_psk options. These are the client PSK identity, and pre-shared-key
+# in hexadecimal format with no "0x". Only one of certificate and PSK based
+# encryption can be used on one
+# bridge at once.
+#bridge_identity
+#bridge_psk
+
+
+# =================================================================
+# External config files
+# =================================================================
+
+# External configuration files may be included by using the 
+# include_dir option. This defines a directory that will be searched
+# for config files. All files that end in '.conf' will be loaded as
+# a configuration file. It is best to have this as the last option
+# in the main file. This option will only be processed from the main
+# configuration file. The directory specified must not contain the 
+# main configuration file.
+#include_dir
+
+# =================================================================
+# rsmb options - unlikely to ever be supported
+# =================================================================
+
+#ffdc_output
+#max_log_entries
+#trace_level
+#trace_output