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You need to set the ROS_MASTER_URI to the IP of the PC running the (single) roscore. So if the roscore is running on the turtlebot it should be

ROS_MASTER_URI=http://192.168.7.2:11311

(and don't forget the Port!). And obviously, if the roscore is running on the RPI, set it to this IP.

You need to set the ROS_MASTER_URI to the IP of the PC running the (single) roscore. So if the roscore is running on the turtlebot it should be

ROS_MASTER_URI=http://192.168.7.2:11311

(and don't forget the Port!). And obviously, if the roscore is running on the RPI, set it to this IP.


Update

For general networking problems, there is a good guide line available on the ROS wiki. Check out especially the section on name resolution