StatisticDataPointSubscriber QML Type

Subscribes to statistics_msgs::msg::StatisticDataPoint messages — This holds the structure of a single data point of a StatisticDataType. More...

• List of all members, including inherited members

Properties

• data : double
• dataType : uint8_t
• message : statisticDataPoint

Signals

• messageReceived(statisticDataPoint msg)

Detailed Description

This message is used in MetricsStatisticsMessage, defined in MetricsStatisticsMessage.msg.

Examples of the value of data point are - average size of messages received - standard deviation of the period of messages published - maximum age of messages published

A value of nan represents no data is available. One example is that standard deviation is only available when there are two or more data points but there is only one, and in this case the value would be nan. +inf and -inf are not allowed.

StatisticDataPointSubscriber receives statisticDataPoint values from a ROS 2 topic. Set the topic and node properties, then connect to the messageReceived() signal.

See also StatisticDataPointPublisher and statisticDataPoint.

Property Documentation

data : double

The data field of the last received message. Updated whenever a new message arrives. dataChanged is emitted on every update.

dataType : uint8_t

The dataType field of the last received message. Updated whenever a new message arrives. dataTypeChanged is emitted on every update.

message : statisticDataPoint

The last message received on topic. Updated whenever a new message arrives.

Signal Documentation

messageReceived(statisticDataPoint msg)

Emitted when a new statisticDataPoint arrives on topic. msg contains the received value.