The session id is a UUID, postfixed by an incrementing number. The UUID stays
the same for Tuhi's livetime, the number increments with every bluetooth
connect/disconnect. Result is e.g. 4e55c30035d043ce9f6f4914fb223820-2.
This session id is printed to the log file, added to the YAML raw logs and to
the JSON file, making it easier which log part resulted in which drawing, etc.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Peter Hutterer