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I have a suspicion that may be the service clients are returning prematurely (check http://docs.ros.org/api/roscpp/html/service__client_8h_source.html#l00081) because the service calls are issued before the services are actually up and ready. So adding

srvcl1.waitForExistence();
srvcl2.waitForExistence();
srvcl3.waitForExistence();

should solve this issue.

(I am assuming the service servers are working fine since the rosservice call commands are working fine. It would always help to post a more descriptive code than just snippets to provide a more authoritative answer :))

I have a suspicion that may be the service clients are returning prematurely (check http://docs.ros.org/api/roscpp/html/service__client_8h_source.html#l00081) because the service calls are issued before the services are actually up and ready. So adding

srvcl1.waitForExistence();
srvcl2.waitForExistence();
srvcl3.waitForExistence();

before the loop should solve this issue.

(I am assuming the service servers are working fine since the rosservice call commands are working fine. It would always help to post a more descriptive code than just snippets to provide a more authoritative answer :))