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