Hi!
Prefixed time is a daytime string that is saved in a dataset.
can be 1 for a group start or individual for individual starts.
The clock of the pc - the start daytime of the race will generate the current running time.
The intermediate time and finishtime will always arrive from a netsocket. everything is on internet.
In the future I will see if add a trigger trough serial connection from a timing device or not…It will depend on the real need.
At the moment is more or less just a desire to learn how to make a program for sport.
Yep I asked to a good friend to give me an help…al the rest honestly is coming from this great community 
Thank you Didikunz, the sample you sent me at the beginning of my journey gave my great bases to proceed