I remember the data entry on the TilePi being pretty unreasonable. I'm remodeling right now and can't repeat the operation, but it took me a long time to figure out when I did it.
I finally found places on the TiltPi GUI where you HAD to hit enter, you couldn't just tab or mouse to another field.
Are you getting the web page of the Pi to update with values? If you aren't getting that then there is nothing to forward to Brewers Friend.
Also, important safety tip, Egon. When you do have a brew going and you are going to empty the fermenter - be sure to turn off the pi before you start. I had moved my fermenter from the basement to the Kitchen, but the bluetooth still picked it up. When I drained the fermenter the Tilt laid on its side and gave crazy readings. That caused my entire batch graph to be way off since it included data that was way out of range. If you don't want your graphs blown up, be sure to turn off your pi before you drain your fermenter.