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2018-06-12 08:51:07 -0500 | marked best answer | subscriber and if-else/switch-case statement Hi there, I am new to ROS and having a bit of problems when using subscriber. I am writing a leader following function and trying to subscribe to a rostopic under a conditional statement, switch statement in this case, but it doesn't work. Key lines of the problem are shown below: In above case, subscription fails. But when I pull the subscriber out of the conditional statement, it subscribe successfully. Could anybody be helpful on this problem if know why, please? Thanks in advance. |
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2014-08-15 17:01:44 -0500 | commented question | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) It was my own mistake that caused the problem, and sorry about that! Anyway, thanks a lot for your time! |
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2014-08-15 16:59:58 -0500 | commented answer | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) Thanks a lot for your time, t.pimentel!!! I have found where I did wrong, and it was a careless mistake. The comparison I made between squad_leader_no and integer value was in different format. Sorry about wasting your time. :/ |
2014-08-15 12:27:03 -0500 | commented answer | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) well, it does not help, either. The weird thing is, it could unsubscribe using shutdown() within callbacks and removing all those if statements in while(). But once I wanted it to resubscribe with if statements in while(), it seemed no unsubscribing and resubscribing happened, it just stayed on initial subscription. |
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2014-08-14 20:06:28 -0500 | commented answer | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) I am wondering if the frequency the loop spinning will be a potential reason causing this problem, like it needs time to proceed received data before subscribing again. |
2014-08-14 20:03:20 -0500 | commented answer | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) hi t.pimentel, I have tried boost::bind and defined squad_leader_no as local, but still got the same results, topics were not chosen and resubscribed then. But when I put 'uav1/split_cmd' as initial condition before while(ros::ok()) and remove all the if statements in while(), it could successfully be shut down. |
2014-08-14 17:00:51 -0500 | commented question | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) I have tried those, but it did not work |
2014-08-14 16:59:41 -0500 | commented answer | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) yes, the squad_leader_no is a global variable so far and its value changes. I will try your code first and let know if the problem has been solved. Thank you. |
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2014-08-14 14:41:07 -0500 | commented question | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) to be more clear, the publisher split_cmd has been defined and publishing in the same .cpp file |
2014-08-14 14:26:53 -0500 | asked a question | [roscpp] unsubscribe within a callback and resubscribe in while(ros::ok) Hi there, as new to ros and c++, I have a question to ask about unsubscribe and resubscribe. I am working on a multi-quadrotor path planning project and need to define squad leader everytime the team split into new squads. In that case, the squad member will subscribe to its leader for further commanding. But I have trouble on how to unsubscribe old leader's command and resubscribe to a new leader's. Below is the part of code that doing this little function: After a numerous tests, only once I have the subscriber resubscribed. At other times, it just seem not to work at all(no disconnection and reconnection). Also, I have tried I have searched and read a lot of tutorials and questions by other people online, it seems that I will have to use |
2014-08-14 14:04:13 -0500 | commented answer | subscriber inside if-else/switch-case statements Thanks a lot, Murilo, but I have closed this question due to duplication. :) |
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2014-08-11 15:48:52 -0500 | commented answer | subscriber and if-else/switch-case statement I have seen what the problem is and thanks for your comment! |
2014-08-11 15:46:48 -0500 | commented answer | subscriber and if-else/switch-case statement I have seen what happens and thanks a lot! |
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