/kb/events

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/kb/events Quick Facts

Category

Knowledge and reasoning

Message type

knowledge_core/Event

Allow to subscribe to events by providing a (set of) partially-bound triples. Calling the service returns an event id. Subscribe then to /kb/events/<id> to be notified everytime a new instance/class match the provided pattern.

See KnowledgeCore documentation for details.

Quick snippets

Call the service from command-line

$ rosservice call /kb/events knowledge_core/Event
# (tip: press Tab to complete the message prototype)

Call the service from a Python script

#!/usr/bin/env python

import rospy
from knowledge_core.srv import *


if __name__ == "__main__":

    rospy.wait_for_service("/kb/events")

    try:
        proxy = rospy.ServiceProxy("/kb/events", Event)
        response = proxy(args...) # check the knowledge_core/Event message type for the expected arguments
        rospy.loginfo(response)

    except rospy.ServiceException as e:
        rospy.logerror("Service call failed: %s" % e)