Sorry for disappearing, but actual work and school took me away from this.
The purpose is not to know when the bus will arrive when I'm at the stop, but to know that before I leave home. Obviously I can download an app for Android or iOS that does that or just go online to TfLs countdown website, but having an LCD displaying that for me is a lot better than using a high end device. Also, I don't have a UK phone number, so data roaming is a big no-no for me.
Also, because I am taking the data from TfL directly there's nothing I can actually do if the data is wrong and I miss the bus. So testing at the bus stop is unnecessary. However, it would be nice to get someone to have a look at it and point out the problems with it.
So far, it doesn't behave nicely if the telegram is broken, but I haven't gotten to look into it, and for the next month that will be impossible (ship ride in the South China seas and no wired Internet at my South Korean apartment).
So if anyone interested can have a look at it, it is here: https://code.google.com/p/tfl-buses/
Please, test and comment on better ways of implementing it and/or any bugs you may have noticed.
To find the bus stop you want to monitor go to http://countdown.tfl.gov.uk/#/
, enter the bus stop name and the bus stop code will be presented there.
The results are updated every 30 seconds (according to TfL), so polling faster than that will only do worse.
Thank you for the interest.