Turtlebot3 doesn't connect properly

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Hello guys,

I'm working with a turtlebot3 waffle_pi. I followed the guidelines of https://emanual.robotis.com/docs/en/p..., to set up the robot. After finishing this set up, I tried to bring up connection between PC and raspberry PI. The commando ssh ubuntu@{IP_ADDRESS_OF_RASPBERRY_PI} works, so I'm connected to the turtlebot. After this I tried to run the following command: roslaunch turtlebot3_bringup turtlebot3_robot.launch, when this command is running the ROS_MASTER_URI is set back to localhost: ROS_MASTER_URI=http://localhost:11311. All the settings in ~/.bashrc are set following the guidelines, thus: export ROS_MASTER_URI=http://IP_OF_MY_REMOTE_PC:11311 and export ROS_HOSTNAME=IP_OF_MY_TURTLEBOT3.

Does anybody know what can be wrong in my setup? Or how to fix this problem?

Thanks in advance!