Turtlebot 3 e-manual - trouble contacting master

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Hi All,

I`m very new to programming, using Linux etc. But I have worked my way through the ROS programming book and am not working through the Turtlebot3 E-manual.

I am trying to bring up basic packages to start the Turtlebot 3 applications but am having an issue in contacting the master (my laptop).

• So I have run 'roscore'
• I then entered 'roslaunch turtlebot3_bringup turtlebot3_robot.launch' on my Turtbebot PC (Raspbian). But I cannot contact the master and am getting the error message: ERROR: unable to contact ROS master at {http://my IP address is here}, The traceback for the exception was written to the log file"".

I have done an extensive search online for a solution and have found many discussions, but due to my inexperienced I am failing to see which solution suits my problem.

Any help greatly appreciated.

Thanks :)