OK, without modification it doesn't compain?

Line #4 should read like:

grep '00:BD:3A\|00:BD:3B'`;

Notice the \| as a separator and the '`; (quote, backtick, semicolon) at the end of the line. You should be able to add as many laps as you like as long as they have the \| in between. If you still have troubles pm me as it might be out of scope to discuss that here - all I can say is that the code runs on my N900 ... or mail me: arne at robota dot nl.