Axis 02457-001 User Manual page 36

M3057-PLR Mk II Dome Camera
The web interface
MQTT
MQTT (Message Queuing Telemetry Transport) is a standard messaging protocol for the Internet of Things (IoT). It was designed for
simplified IoT integration and is used in a wide variety of industries to connect remote devices with a small code footprint and
minimal network bandwidth. The MQTT client in Axis device firmware can simplify integration of data and events produced in the
device to systems which are not video management software (VMS).
Set up the device as an MQTT client. MQTT communication is based on two entities, the clients and the broker. The clients can
send and receive messages. The broker is responsible for routing messages between clients.
You can learn more about MQTT in AXIS OS Portal.
ALPN
ALPN is a TLS/SSL extension that allows for the selection of an application protocol during the handshake phase of the connection
between the client and server. This is used to enable MQTT traffic over the same port that is used for other protocols, such as HTTP.
In some cases, there might not be a dedicated port open for MQTT communication. A solution in such cases is to use ALPN to
negotiate the use of MQTT as the application protocol on a standard port, allowed by the firewalls.
MQTT client
Connect: Turn on or off the MQTT client.
Status: Shows the current status of the MQTT client.
Broker
Host: Enter the hostname or IP address of the MQTT server.
Protocol: Select which protocol to use.
Port: Enter the port number.
• 1883 is the default value for MQTT over TCP
• 8883 is the default value for MQTT over SSL
• 80 is the default value for MQTT over WebSocket
• 443 is the default value for MQTT over WebSocket Secure
ALPN protocol: Enter the ALPN protocol name provided by your MQTT broker provider. This is only applicable with MQTT over SSL
and MQTT over WebSocket Secure.
Username: Enter the username that the client will use to access the server.
Password: Enter a password for the username.
Client ID: Enter a client ID. The client identifier is sent to the server when the client connects to it.
Clean session: Controls the behavior at connection and disconnection time. When selected, the state information is discarded
at connect and disconnect.
Keep alive interval: The keep alive interval enables the client to detect when the server is no longer available without having
to wait for the long TCP/IP timeout.
Timeout: The time interval in seconds to allow a connect to complete. Default value: 60
Device topic prefix: Used in the default values for the topic in the connect message and LWT message on the MQTT client tab,
and in the publication conditions on the MQTT publication tab.
Reconnect automatically: Specifies whether the client should reconnect automatically after a disconnect.
Connect message
Specifies if a message should be sent out when a connection is established.
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