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You say you have "full internet connectivity", but it looks like name resolution is failing.

In the first log, the beginning and the end of the traceback stand out:

remote[bbone-0]: Exception while registering with roslaunch parent [http://T1538:44498/]: Traceback (most recent call last):

and

gaierror: [Errno -2] Name or service not known

It looks like your beaglebone is trying to connect to http://T1538:44498/ and failing because it can't resolve the hostname of your laptop.

As suggested in the Name Resolution section of the Network Setup guide, you should set up the ROS_IP environment variable, or configure your /etc/hosts file on each machine.