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.

Why we need to source package in order to use rosservice

asked 2021-04-13 19:35:45 -0600

CroCo
153 ●24 ●39 ●51

I've implemented very simple node that contains service to reset a counter. When I open up a new terminal and perform the following

rosservice call /request 'reset'

I get this error:

ERROR: Unable to load type [srv_counter/CounterServiceMsg]. 
Have you typed 'make' in [srv_counter]?

Even though the node that contains this service is running and rosservice list indeed shows the service in the list. Sourcing my package source ./devel/setup.bash solves the problem. I'm wondering why this occurs. Why rosservice is able to see the service but fails to call it.

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2021-04-13 20:51:26 -0600

130s

10937 ●203 ●339 ●330 http://www.linkedin.co...

updated 2021-04-14 08:41:59 -0600

Glad you got it working!

Have you typed 'make' in [srv_counter]?

This seems to be FAQ on this forum. You may find other threds that explain this well e.g. #q254699.

ROS Service is server-client system, which consists of Service server and Service client. What rosservice list returns is a list of currently running Service server nodes. On the other hand, rosservice call creates a Service client node. As #q254699 explains, the environment for both nodes needs to know about the same Service definition, which in your case source ./devel/setup.bash resolves.

edit flag offensive delete link

add a comment

Question Tools

2 followers

Stats

Asked: 2021-04-13 19:35:45 -0600

Seen: 224 times

Last updated: Apr 14 '21

Why we need to source package in order to use rosservice edit

1 Answer

Question Tools

Stats

Related questions

Why we need to source package in order to use rosservice