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BeamOS – MQTT

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Summary

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 endpoint. RUT 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. This chapter is a summary of the MQTT function in BEAM routers.

MQTT Broker

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.

BeamOS Services MQTT Broker screen
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

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

BeamOS services MQTT broker settings secuirty screen
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: ” “
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: ” “
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: ” “
Specifies the local port that the MQTT broker will listen to
TLS Version
tlsv1.1 | tlsv1.2 | Support all; Default: Support all
Authenticates a client to a server and establishes precisely who they are

Bridge

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.

BeamOS services MQTT broker settings bridge screen
Field Name
Value
Description
Enable
yes | no; Default: no
Toggles MQTT Bridge ON or OFF
Connection Name
string; Default: ” “”
Name of the Bridge connection. Although this is used for easier management purposes, this field is mandatory
Remote Address
ip; Default: ” “
Remote Broker’s address
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: ” “
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

Micellaneous

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

BeamOS services MQTT broker settings Misc Screen
Field Name
Value
Description
ACL File
.ACL file; Default: ” “
The contents of this file are used to control client access to topics of the broker
Password File
password file; Default: ” “
The Password file stores user names and corresponding passwords, used for authentication
Persistance
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

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

BeamOS services MQTT publisher
Field Name
Value
Description
Enable
yes | no; Default: no
Toggles the MQTT Publisher ON or OFF
Hostname
host | ip; Default: ” “
Broker’s IP address or hostname
Port
integer [0..65535]; Default: 1883
Specifies the port used for connecting to the Broker
Username
string; Default: ” “
Username used for authentication when connecting to the Broke
Password
string; Default: ” “
Password used for authentication when connecting to the Broker
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