[ros-users] Pharo client for ROS.

[Santiago Bragagnolo]

Thanks!

2012/9/13 Jack O'Quin <jack.oquin at gmail.com>

> Please ask these questions (preferably one at a time) on answers.ros.org.
> See:
>
>
> http://www.ros.org/wiki/Support#Guidelines_for_asking_a_question_.28Please_read_before_posting.29
>
> Thanks!
>
> On Thu, Sep 13, 2012 at 1:26 PM, Santiago Bragagnolo
> <santiagobragagnolo at gmail.com> wrote:
> > Hi Ros people! My name is Santiago, i'm just beginning in robot-world,
> and
> > i'm making a client from Pharo smalltalk. My first goal is make work the
> > turtle simulator from XMLRPC.
> >
> > So i have several questions, but right now i have two most important:
> >
> > Considering a remote client (without direct access to server):
> >
> > -  How can i get the message definition related to a topic? Can i ask to
> the
> > topic? Does the topic answer me in the error text something about the
> type?
> >
> > - Is any definition of a common TCPROS package to take as example of
> topic
> > usage?
> >
> >   In this case, i'd spend a lot of time today trying to send messages to
> the
> > turtle throgh the velocity topic without any response (no movement, no
> > error, no feedback at all) and i tried with the logs, but without any
> useful
> > data.
> >
> >  The process i'm following is:
> >
> >   execute roscore
> >   execute turtle node
> >
> >   then, from the client
> >
> >   register as publisher in Velocity topic
> >
> >   with the IP:PORT recived connect to the node with a TCP/ip connection
> >   sending a message with:
> >
> > header
> >         type: master getTopicTypeRelated:/turtle1/command_velocity;
>  #here i
> > get the topicType from getTopicTypes
> >         topic: /turtle1/command_velocity;
> >         latching: false;
> >         callerId: anArbitraryId;
> >         messageDefinition: 'float32 linear
> > float32 angular';
> >         md5Sum:'9d5c2dcd348ac8f76ce2a4307bd63a13'.
> >
> > in the body of the request i tried with float numbers (2.0 0.0) for
> example.
> >
> > All this data in binary.
> >
> > I browse a lot of roscpp, rospy and rosjava trying to find how them
> create
> > and serialize the data, but i dont find meaningful differences. Maybe i'm
> > missing steps?
> >
> >
> > Thank you very much!
> >
> >
> > Santiago.
> >
> >
> >
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> >
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>
>
>
> --
>  joq
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