Networking TurtleBot 3 and the remote computer
The TurtleBot 3 and remote computer must be configured to set up communications on the same network. Each computer's IP address should be identified and used to establish the ROS environment variable for the communication system. The following figure shows how these variables are identified:

TurtleBot 3 and remote computer ROS network configuration
Note that the TurtleBot 3 and the remote computer identify the remote computer IP address as the ROS_MASTER_URI
variable. This setup is different than that for the ROS variables for TurtleBot 2. For TurtleBot 3, the Master resides on the remote computer.
The next two sections will step through the network configuration setup process.
Remote computer network setup
The remote computer should be set to connect to the same network as the TurtleBot 3. Determine the remote computer's IP address on that network by typing:
$ ifconfig
From the screen output, look for the IP address of this computer on the wireless...