Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

Revision history [back]

Services are synchronous, therefore your client will wait for an answer before resuming execution. Topics are asynchronous, which means you can send a request and the client can continue the execution. To get a similar behaviour to a service but async, you'll need one topic to send the request and one topic to listen for an answer.

ROS Answers is licensed under Creative Commons Attribution 3.0 Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.