The info is stored in the "connection header". Both rospy and roscpp
provide access to this data. In rospy, it is simply the
._connection_header field. In roscpp, you use MessageEvent, described
in the overview here:

http://www.ros.org/wiki/roscpp/Overview/Publishers%20and%20Subscribers#MessageEvent_.5BROS_1.1.2B-.5D

 - Ken

On Mon, Sep 20, 2010 at 8:44 AM, Axelrod, Benjamin <baxelrod@irobot.com> wrote:
> Is there any way for the receiver of a message to know who sent the
> message?  I looked through the generated header file for a message and I
> didn’t see any meta data like this.  But I believe the core should know it
> on some level, and it would be great to have this info.
>
>
>
> Thanks,
>
> -Ben
>
>
>
> Ben Axelrod
>
> Research Scientist
>
> iRobot Corporation
>
> 8 Crosby Drive, Mail Stop 8-1
>
> Bedford, MA 01730
>
> (781) 430-3315 (Tel)
>
> (781) 960-2628 (Fax)
>
> baxelrod@irobot.com
>
>
>
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