Do you not get warnings when doing that?  I'm pretty sure we've been meaning
to remove that ability, and you should be getting a warning like:

"Advertising on topic [<topic>] with md5sum [*].  If you are not playing
back an old bag file, this is a problem."

What output do you get when they mismatch?

Josh

On Sat, Mar 27, 2010 at 11:31 PM, Ken Tossell <ktossell@umd.edu> wrote:

> Thanks, Eric and Josh. I've used the ShapeShifter class from topic_tools
> to build a multi-topic, on-demand proxy. It's still advertising its
> topics using the '*' checksum since I really don't want to have it
> subscribe to any topics before it starts advertising them, but that
> seems to work all right (and should be fine as long as you don't have
> mismatched messages [?]).
>
> http://www.ros.org/wiki/proxy
>
> I constructed a message mismatch -- where the sender and the receiver
> (across a repeater) had different message definitions -- and tested it
> using rostopic. The connection was dropped immediately.
>
> Ken
>
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