Add null check on finding description entry
More verbose error message on failed L-data.con to KNXnet/IP client
More accurate frame dispatching to KNX subnets (no duplicates)
Add method for creating L-Data.con with negative confirmation
Comment out tracing of KNX property changes (too much noise)
Minor formatting
Use internal method for creating L-Data.con, send .con non-blocking
Refine logging output