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2017-03-03 04:32:18 -0500 | asked a question | ActionServer not calling trancition callback on every goal result. Hello. I am learning to work with "non-simple" action server/client. I used tutorial that calculates Fibonacci sequence in "actionlib_tutorials" pkg and changed SimpleActionServer to ActionServer(and client). I tried to use servers goal callback only for receive goal, and do all work in thread. GoalHandles i am storing in some container to have access them from thread (is it correct?) I sending goal from and its working fine until i sending many(3 in example) goals. ActionServer receives them and start thread for each. Now im expecting the same transitions order on client side but 3 times. But only one random goal reaches example: I know that ActionServer and Client communicates with each other between topics. I changing goal states on server side without any delay and maybe its very quick for client subscriber and it looses some result messages? I used rqt topic monitor and created my own subscriber, but they are both receiving all 3 message.
Why its stuck only on Where is the problem? Thank You. Here is the code: Server Client: (more) |
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2015-08-06 09:46:14 -0500 | asked a question | Smooth JointTrajectory calculation HI.I wrote simple adapter to my robot that listen topic with JointTrajectory messages, and motors drivers rotating motor angles by this messages. First question: is JointTrajectory good option for this task? All motor features hidden from me, and i cant control motor in low level layer, i just can set rotation angle. One of the features- limitation of instant angle rotation (for example: it cant move from 0 deg to 90deg instantly, because limit on 50deg and it stops on 50deg). That limitation implemented in low level layer of motor and i don't have access to it. Right way, i think, to rotate it smoothly, by small angle, and small time interval. Second question: what can i use in ros, to calculate JointTrajectory with smooth joint rotation? I know i can calculate by myself, but i just want to know if some tool is exist. Thank you. |
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2015-07-21 04:33:35 -0500 | asked a question | Cant set Start State of robot in planning pane Hello. I generated my robots moveit package with moveit_setup_assistant, but i cant set start state in planing pane in rviz. I just can set goal state, and when i click "Plan" button, it moves between "unknown" start state and goal state in infinite loop. I have no idea what can be wrong. Thank you for any help. Thank You, gvdhoorn. It helped. But i have one more question, that i forgot to write above: There is no reaction when i move effectors ball in rviz. I looked for right option in "Planning Request" this time, but didnt find anything about this. |
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2015-06-25 04:19:03 -0500 | commented answer | How to use Twist messages in robo-arm? Thank you, it really helps! |
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2015-06-25 03:47:50 -0500 | asked a question | How to use Twist messages in robo-arm? Hello. We have arm with servo joints,we are writing controller for it, and i don't know how correctly apply Twist messages,to control it. Some questions: 1)If task is only to rotate angles of servos , i need only "angular" field of Twist? 2) If arm has 4 servos, i have to send 4 Twist for each of them? How should i do this? Arrays, separated topics or otherwise? 3) Twist not used for this tasks and this questions don't make sense. I will be appreciate any advice. Thank you very much. |
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2015-05-16 04:18:34 -0500 | asked a question | recieve all data from tf message
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