The two most important communication features in ROS 2 are Topics and Services.

Topics are used for data streams, and Services for a client/server interaction.

At the end of this section you’ll be able to make your nodes communicate with ROS2 Services.

Here’s what you’ll do:

• Understand what ROS Services are, and when to use them, thanks to a real life analogy.

• Write your own Service (client + server) in both Python and C++.

• Introspect Services from the terminal.

• Experiment on Turtlesim.

And, as usual, you will finish the section with an activity, based on all the code you’ve written so far.

When you feel ready, let’s get started!