RUT955 MQTT (legacy WebUI)

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The information in this page is updated in accordance with the RUT9XX_R_00.06.08.5 firmware version.

Note: this user manual page is for RUT955's old WebUI style available in earlier FW versions. Click here for information based on the latest FW version.

Summary[edit source]

MQTT (MQ Telemetry Transport or Message Queue Telemetry Transport) is an ISO standard (ISO/IEC PRF 20922) publish-subscribe-based "lightweight" messaging protocol for use on top of the TCP/IP protocol. It is designed to send short messages from one client (publisher) to another (subscriber) through brokers, which are responsible for message delivery to the end point.

RUT9XX routers support this functionality via an open source Mosquitto broker. The messages are sent this way: a client (subscriber) subscribes to a topic(s); a publisher posts a message to that specific topic(s). The broker then checks who is subscribed to that particular topic(s) and transmits data from the publisher to the subscriber.

The following chapter is a summary of the MQTT function in RUT9XX routers. For in-depth MQTT configuration examples, refer to this page: Monitoring via MQTT.

MQTT Broker[edit source]

The Broker will “listen” for connections on the specified Local port. In order to accept connections from WAN, you also need to check Enable Remote Access.

Services mqtt broker.PNG

Field name Value Description
Enable yes | no; default: no Toggles MQTT Broker ON or OFF.
Local Port integer [0..65535]; default: 1883 Specifies the local port that the MQTT broker will listen to.
Enable Remote Access yes | no; default: no If enabled, MQTT Broker will be reachable by remote user (from WAN).

Security[edit source]


The MQTT Security tab is used to establish MQTT connection security via TLS/SSL.

Services mqtt broker settings security.PNG

Field name Value Description
Use TLS/SSL yes | no; default: no Toggles the use of TLS/SSL certificates ON or OFF.
CA File .ca file; default: none Certificate authority is an entity that issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate.
CERT File .crt file; default: none Certificate file is a type of digital certificate that is used by client systems to make authenticated requests to a remote server. Client certificates play a key role in many mutual authentication designs, providing strong assurances of a requester's identity.
Key File .key file; default: none Private key for client to establish connection.
TLS version tlsv1.1 | tlsv1.2 | Support all; default: Support all Authenticates a client to a server and establishes precisely who they are.

Bridge[edit source]


The MQTT Broker also supports a functionality called Bridge. An MQTT Bridge is used for the communication between two MQTT Brokers. The window of Bridge parameters is presented below. Some of these are mandatory as they are needed to create a connection: Connection Name, Remote Address and Remote Port. For more information on MQTT Bridge parameters you can read the official mosquitto.conf manual page.

Services mqtt broker settings bridge.PNG

Field name Value Description
Use TLS/SSL yes | no; default: no Toggles MQTT Bridge ON or OFF.
Connection Name string; default: none Name of the Bridge connection. Although this is used for easier management purposes, this field is mandatory.
Remote Address ip; default: none Remote Broker’s address.
Remote Port integer [0..65535]; default: 1883 Specifies which port the remote broker uses to listen for connections.
Use Remote TLS/SSL yes | no; default: no Enables the use of TSL/SSL certificates of the remote broker. If this is checked, you will be prompted to upload TLS/SSL certificates. More information can be found in the Security section of this chapter.
Use Remote Bridge Login yes | no; default: no Enables the use of Remote login data. If this is checked, you will be prompted to enter a remote client ID, username and password.
Topic string; default: none Specifies the names of the Topics that your Broker will subscribe to.
Try Private yes | no; default: no Check if the remote Broker is another instance of a daemon.
Clean Session yes | no; default: no Check to discard session state after connecting or disconnecting.

Topics[edit source]


The Topic section is used to add and configure topics for MQTT communication.

Networking rut manual mqtt broker settings bridge topics.png

Field Value Description
Topic string; default: none The name of this topic.
Direction OUT | IN | BOTH; default: OUT Specifies the direction in which messages for this topic can be shared in.
QoS level integer; default: 0 The publish/subscribe QoS level for this topic..
Delete - (interactive button) Deletes the topic next to it.

Miscellaneous[edit source]


The last section of MQTT Broker parameters is called Miscellaneous. It contains parameters that are related to neither Security nor Bridge.

Services mqtt broker settings misc.PNG

field name value description
ACL File .ACL file; default: none The contents of this file are used to control client access to topics of the broker.
Password File password file; default: none The Password file stores user names and corresponding passwords, used for authentication. The file can be produced by mosquitto_passwd on the ssh command line, see https://mosquitto.org/man/mosquitto_passwd-1.html
Persistence yes | no; default: no If enabled, connection, subscription and message data will be written to the disk. Otherwise, the data is stored in the router’s memory only.
Allow Anonymous yes | no; default: yes If enabled, the Broker allows anonymous access.

MQTT Publisher[edit source]

An MQTT Publisher is a client that sends messages to the Broker, who then forwards these messages to the Subscriber.

Networking rut955 manual mqtt publisher v1.png

field name value description
Enable yes | no; default: no Toggles the MQTT Publisher ON or OFF.
Hostname host | ip; default: none Broker’s IP address or hostname.
Port integer [0..65535]; default: 1883 Specifies the port used for connecting to the Broker.
Username string; default: none User name used for authentication when connecting to the Broker.
Password string; default: none Password used for authentication when connecting to the Broker.
TLS yes | no; default: no Toggles the TLS authentication between ON or OFF.
Allow insecure connection yes | no; default: no If enabled, router will be allowed to not verify server's authenticity.
CA file .ca file; default: none Certificate authority is an entity that issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate.
Certificate file .crt file; default: none Certificate file is a type of digital certificate that is used by client systems to make authenticated requests to a remote server. Client certificates play a key role in many mutual authentication designs, providing strong assurances of a requester's identity.
Key file .key file; default: none Private key for client to establish connection.