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I am new to ROS too and below are some of my experiences

1) Both workstation and the mobile robot can have different rosdistro. My current setup is Lunar + Kinect

2) Never forget to export the following three things in your terminal or ~/.bashrc. All the addresses below are for display purpose. It is different for everyone. In my case, without any one of them, the whole thing will not work.

• #export ROS_MASTER_URI=http://192.168.1.118:11311/ (address displayed on workstation's roscore)
• #export ROS_HOSTNAME=192.168.1.118 (address of master/slave)
• #export ROS_IP=192.168.1.118 (address of master/slave)

3) Lastly, try synchronize time of both workstation and the mobile robot. For example, try sudo ntpdate 192.168.6.104 (Address of master) on your mobile robot either by ssh or ~/.bashrc