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Multiple subscribers to service

asked 2016-05-31 23:41:37 -0600

Rhapsodos gravatar image

Good evening,

I may have misunderstood the concept of ROS services, but is it possible to have multiple client calling for the same service?

For instance, I have a service running on a server that processes raw images and returns informations about them. Can I have a service that use those informations and another that register the output of server?

If yes, should I create a new node that publish the data, or is it possible to make the service directly speak with the database?

Thank you in advance, Julien Girard

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answered 2016-06-01 02:45:01 -0600

JohnDoe2991 gravatar image

I may have misunderstood the concept of ROS services, but is it possible to have multiple client calling for the same service?

Yes, this is possible. A service-server offers a service, that any node can use. Each client sends some information to the service and gets a corresponding response. See also here for a simple example.

For instance, I have a service running on a server that processes raw images and returns informations about them. Can I have a service that use those informations and another that register the output of server?

So, if I understand correctly, you want to send some raw images to the service server and get information about them as a response? Yes, this is possible with a service server. If your server just processes the images it gets from an external non-ROS source and you want to use them in another ROS node, then it would be better to publish them as a topic.

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Thank you very much for your explanation. Considering that I have nodes that uses differently inputs and outputs of this server, I will publish them on a topic.

Rhapsodos gravatar imageRhapsodos ( 2016-06-02 03:08:54 -0600 )edit

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Asked: 2016-05-31 23:41:37 -0600

Seen: 431 times

Last updated: Jun 02 '16