rosservice call not implemented

Question

Luca Spanò Cuomo 2019-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/474927-rosservice-call-not-implemented

评论： Cam Salzberger 2020-1-2

Hi everyone. I am trying to use Matlab with MavRos inorder to command a drone in Gazebo. The drone is equipped with a virtual Pixhawk oard running PX4. I can retrieve information aout some sensors. My problem is I cannot call the rosservices. Matlab has Rosservice function. It implements 'list', info', 'type' and 'url' but not 'call', the most important to me. Can I bypass the problem? Thanks

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Answer 1

Cam Salzberger 2019-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/474927-rosservice-call-not-implemented#answer_386668

Hello Luca,

The rosservice function is designed to give introspection information from the network about available services. For actual setting up of service clients and servers, you can use the rossvcclient and rossvcserver functionality. See here for a comprehensive example.

-Cam

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Mub 2019-12-27

Hi,

The docs don't mention how to call a service, they just mention the following:

Create a service server
Create a service client

For example a service that already exist is called /mavros/cmd/arming

What I normally do is

rospy.wait_for_service('/mavros/cmd/arming')
armService = rospy.ServiceProxy('/mavros/cmd/arming', mavros_msgs.srv.CommandBool)
armService(True)

Any idea on how to do it in MATLAB?

Cam Salzberger 2020-1-2

See the last link I provide in my answer, when they call the "call" function. This is what performs the actual service call. In MATLAB, the call to services is synchronous, so there is no need to "wait for" it to complete.

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