PRTG Manual: MQTT Round Trip Sensor

Credentials

This sensor requires credentials for MQTT.

IPv6

This sensor supports IPv6.

Performance impact

This sensor has a low performance impact.

New framework

This sensor was converted to a new framework. MQTT Round Trip sensors that were added before PRTG 20.2.59 do not work anymore. We recommend that you pause existing sensors to keep their historic data. To continue monitoring, please add a new MQTT Round Trip sensor.

Lookups

This sensor uses lookups to determine the status values of one or more channels.

Multi-platform probe

You can add this sensor to a multi-platform probe.

Topic

Enter the topic for the round trip. The default is PRTG/roundtrip/%sensorid.

PRTG replaces %sensorid with the sensor's ID.

Connection Settings

Define the connection settings for the connection to the MQTT broker:

• Use default settings: Use the default connection settings.
• Use custom settings: Use a ClientID that you can specify below.

ClientID

This setting is only visible if you select Use custom settings above.

Enter the ClientID for the connection to the MQTT broker. The default is PRTG_%sensorid.

PRTG replaces %sensorid with the sensor's ID. For the subscribing client, PRTG automatically adds _subscriber to the ClientID. For the publishing client, PRTG automatically adds _publisher to the ClientID.

Primary Channel

Select a channel from the list to define it as the primary channel. In the device tree, PRTG displays the last value of the primary channel below the sensor's name. The available options depend on what channels are available for this sensor.

You can set a different primary channel later by clicking below a channel gauge on the sensor's Overview tab.

Graph Type

Define how this sensor shows different channels:

• Show channels independently (default): Show a graph for each channel.
• Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
  You cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).

Stack Unit

This setting is only visible if you select Stack channels on top of each other above.

Select a unit from the list. PRTG stacks all channels with this unit on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so.

Result Handling

Define what PRTG does with the sensor result:

• Discard result: Do not store the sensor result.
• Store result: Store the sensor result and the last response in the \Logs\sensors subfolder of the PRTG data directory on the probe system. The file name is Result of Sensor [ID].log. This setting is for debugging purposes. PRTG overwrites this file with each scanning interval.

This option is not available when the sensor runs on the hosted probe of a PRTG Hosted Monitor instance.

In a cluster, PRTG stores the result in the PRTG data directory of the master node.

Downtime

In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status.

Publisher Connection Time

The time it takes the publisher to connect

Round Trip Time

The RTT of the message (after both publisher and subscriber connect)

This channel is the primary channel by default.

Status

The round trip status

• Up status: Roundtrip Complete
• Down status: Message Not Received, Message Not Sent, Publisher Could Not Connect, Subscriber Could Not Connect

Subscriber Connection Time

The time it takes the subscriber to connect