Hi, I would recommend taking a good look at the mesh sdk v2.1.1 documentation found here. If you look at the light switch example, you will notice that the bool m_relay_enabled is set true, which allows for automatic relaying between the different mesh nodes. The example also shows how the client device is able to send unicast & broadcast messages to the server devices to turn the server device lights on & off. In addition, all provisioned nodes send health messages to the provisioner device. All nodes relay messages to each other, so this is a good example that showcases how you can send messages & how the relay functionality works.
