If the device is connected (inserted in cradle) to a PC I
want to disconnect it for a while. Later I want to connect
to PC again (without take the device up and insert in
cradle).
How could I do this?

I found the RasHangUp function which seems to work fine to
disconnect (I can't see the device in file explorer on PC
and I get the "disconnect" sound on device).

To connect I try to start repllog.exe but I get the
ordinary "Connect To" message with info "Status:
Connecting to Host" forever.

Any suggestions how to solve something if this?

I see the RasDial function but is it possible to know what
parameters to use+