If the sender, the receiver, and the topic are the same, and you are
using reliable transport (not sure about the unreliable one), you will
have in-order delivery.

On Fri, 2010-07-23 at 19:46 +0000, Peter Müller wrote:
> Hi,
> 
> I have a question again. 
> So I am (more or less) aware how two nodes communicate. Since
> currently I use a TCP-Stream between the nodes, can I assume that
> every published message arrives at the subscriber of a topic in the
> same order?
> 
> TCP suggests it does, however I am not sure with ROS as a "layer".
> 
> Thanks in advance.
> 
> 
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