as special events.

If we store all received events to a file, this dump is now
self-contained. Helps to analyze traces.

Some functions have also been factorized in the process, too much
duplication.

(Also tracer/Makefile was forgotten in previous commit, included
in this one...)

This message sends configuration for all events.

to connect until it succeeds

it probably makes things zillion times slower but it seems to be necessary