Couldn't get Bluetooth console working with Python on my N93

I couldn't do the most basic thing and connect my terminal.app with my Python running on my Nokia N93. Aaargh!

I followed the Using the Python for Series 60 Bluetooth Console from OS X HOW TO from Erk Smartt but was unsuccessful.

Invoking the Bluetooth console from the python app on the Nokia N93 worked but then after typing "screen /dev/tty.BT_CONSOLE", I get the following error messages: "Cannot open line '/dev/tty.BT_CONSOLE' for R/W: Resource busy " followed by "Sorry, could not find a PTY. ".

What am I doing wrong? I know I had this working with my Mac and Series 60 Python on the N70 back in the day so it's a bit frustrating!