Modify to work with Bluetooth from Linux

I have to do some tweaks in order to get reliable Bluetooth
connection to work:
* Extra sleep before open (don't really know why)
* Increase timeout to 5s (seems to work without this today, but
  let's keep it).
* Don't clear lingering data, it seems like DTS does not work
  as the code expects it to work and this code just removed the
  IOIO identification string that is the first thing sent.
* Add some extra sysouts when something goes wrong.