How to use services ?

asked 2017-05-17 02:51:52 -0500

Milow
1 ●3 ●3 ●5

updated 2017-05-17 02:53:48 -0500

According to this tutorial [ http://wiki.ros.org/ROS/Tutorials/Wri... ], I thought we could use a service like :

    client = n.serviceClient<std_srvs::Empty>("/reset_positions");
    ros::service::waitForService("/reset_positions");
    std_srvs::Empty reset_srv;
    client.call(reset_srv);

But execution is blocked on the waitForService instruction and return :

[ INFO] [1495007235.234008766]: waitForService: Service [/reset_positions] has not been advertised, waiting...

Is there something I missed to run this service ?

answered 2017-05-17 03:00:08 -0500

NEngelhard
3519 ●24 ●58 ●89

It looks like you have only a client, but no node that is actually providing the service. What is the outout of 'rosservice list' before running your client?

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There is only this two lines :
/rosout/get_loggers
/rosout/set_logger_level

How can I launch the node to provide the service ?

Milow ( 2017-05-17 03:06:58 -0500 )edit

Just do the tutorial you linked...

NEngelhard ( 2017-05-17 09:28:36 -0500 )edit

I did it, I created a ServiceServer who is running a personnal service. I can call this service (only displaying a "hello world" when called). But I don't see how to use the reset_positions service to reset the position of my turtlebot.

Milow ( 2017-05-17 09:33:05 -0500 )edit

So to reword, I know how to create my own service, but it's not what I want to do. I would like to run an existing service called "reset_positions". I can create a service called the same name and advertised it from a node and run that, that's the tutorial, but it would be useless to me. Any idea ?

Milow ( 2017-05-18 02:47:33 -0500 )edit

Can anyone tell me how client.call function uses TCP protocol ?

shantanu543 ( 2017-06-21 01:44:09 -0500 )edit

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