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It sounds that you didn't configure your ROS_IP variable.

Let's assume that the IP of your master (where the roscore is running - the raspberry pi in your case) is 192.168.1.1, so you will have to run

export ROS_MASTER_URI=http://192.168.1.1:11311

export ROS_IP=192.168.1.1

And assume on the slave computer the IP is 192.168.1.2, you will have to run

export ROS_MASTER_URI=http://192.168.1.1:11311

export ROS_IP=192.168.1.2

After that you should have ROS connectivity

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