[ros-users] re-subscription

[Klaus Petersen]

Problem has been resolved. I tried to run roscore on my linux box again 
and this time, for mysterious reasons, it worked. That also resolved the 
re-subscription problem.

Thanks,
Klaus


Klaus Petersen さんは書きました:
> Hi Tully,
> 
> Thanks for the suggestions. I am starting roscore separately and it 
> keeps running when I restart the publisher. Indeed it seems like there 
> is something wrong with the communication to the master node for 
> re-publishing. I hear the sound of the network blues..
> 
> Klaus
> 
> 
> Tully Foote さんは書きました:
>> Klaus,
>> Are you starting your roscore seperately and is it staying up when you 
>> restart your publisher?  
>>
>> This is on speculation, but the symptoms are consistent.  If you are 
>> starting your publisher first with roslaunch it will automatically 
>> launch roscore.  However when you take down that first roslaunch the 
>> roscore will come down with it.  This will orphan any running nodes, and 
>> they will not work properly once they have lost contact with the 
>> master.  If you are relying on roslaunch to start the roscore for you, I 
>> would suggest manually starting it separately so that you can make sure 
>> it stays up when you restart other nodes. 
>>
>> Tully
>>
>> On Thu, Mar 4, 2010 at 7:51 AM, Brian Gerkey <gerkey at willowgarage.com 
>> <mailto:gerkey at willowgarage.com>> wrote:
>>
>>     On Thu, Mar 4, 2010 at 3:51 AM, Klaus Petersen
>>     <klaus at takanishi.mech.waseda.ac.jp
>>     <mailto:klaus at takanishi.mech.waseda.ac.jp>> wrote:
>>      > I have a very basic problem: First, I establish a connection
>>     between a
>>      > publisher node and a subscriber node. At this point I can receive
>>      > messages from the publisher with the subscriber node. But when I
>>      > re-start my publisher node (quit and run again) the subscriber
>>     does not
>>      > automatically resubscribe to the message. I have to restart the
>>      > subscriber as well to be able to receive again. Is this the normal
>>      > behavior with ros or am I doing something wrong? I have quite a big
>>      > robot control program tied to one of the nodes, so restarting
>>     along the
>>      > way (the initialization of the robot takes ages) is very troublesome.
>>
>>     hi Klaus,
>>
>>     Something's going wrong there.  When your publisher is restarted, it
>>     should re-advertise with the master, which should send the new
>>     publisher list to your subscriber, which should then re-connect to
>>     your publisher.
>>
>>     You can test this behavior with roscpp_tutorials/talker and
>>     roscpp_tutorials/listener; no matter in what order they're
>>     (re)started, listener will always connect to talker.
>>
>>     Can you tell us something about your publisher and subscriber? Is
>>     there anything unusual about your subscriber?
>>
>>            brian.
>>     _______________________________________________
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>>
>>
>>
>>
>> -- 
>> Tully Foote
>> Systems Engineer
>> Willow Garage, Inc.
>> tfoote at willowgarage.com <mailto:tfoote at willowgarage.com>
>> (650) 475-2827
>>
>>
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