What language(s)? Do the topics match? Is it all on one machine? What do the log files say? Do they work if you start them outside the launch file?
I am trying to get a publisher/subscriber connection working within my own ros pkg and I am having issues. I am able to get the talker/listener tutorial working but what I am doing is slightly different.
I have an ros program that sets up a TCP socket and waits for a connection. When the user sends the appropriate command on that socket, I want it to publish a message and that message is redirected to the other program. Right now, everything starts using a launch file and when it starts, the publisher shows that there are 0 subscribers and the subscriber shows that there are 0 publishers.
Are there any special timing conditions that I need to take into account? Is there anything else that I should look at?
Thanks,
Robbie
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