Can a ros node do the equivalent of 'rosnode ping'

asked 2012-03-06 05:30:23 -0500

Murph
1033 ●33 ●41 ●55 http://localhost/

Is there a way (hopefully in rospy) do something like 'rosnode ping' natively? I want to check if another node is running.

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answered 2012-03-06 05:35:19 -0500

kwc
12244 ●54 ●90 ●132 http://kwc.org/

Yes, but its probably a bad idea to code this sort of logic into your nodes. The intent of an anon pub/sub system is to not know what other nodes are running. That way you can freely interchange bags, alternate implementations, etc... Instead, test for the data/state you want to see, rather than the nodes you want to see.

For how to do the ping operation, simply read the source of rosnode. It requires making outbound XMLRPC calls, so it is a 'slow' operation.

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Thanks for the answer. Yeah, this is not a good idea generally, but it makes sense for my project.

Murph ( 2012-03-07 08:29:12 -0500 )edit

As a follow-up, can a node figure out it's actual name? (If it was created with anonymous=True).

Murph ( 2012-03-07 08:30:18 -0500 )edit

Please see the API overview docs: http://ros.org/wiki/rospy/Overview/Names%20and%20Node%20Information

kwc ( 2012-03-07 09:46:09 -0500 )edit

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answered 2022-06-03 06:06:37 -0500

mohamed ahmed
65 ●6 ●12 ●14

You can use rosnode_ping_all() or rosnode_ping()

     import rosnode

     alive_nodes, unpinged_nodes = rosnode.rosnode_ping_all() 

     rosnode.rosnode_ping(node, max_count=5)

you can find the documentation of the rosnode module here

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Can a ros node do the equivalent of 'rosnode ping'

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