Set the parameters for a uni-station mode connection for the
given SLCD struct. If the stream entry already exists, overwrite
the previous settings.
Also sets the multi-station flag to 0 (false).
Parameters:
selectors selectors for this net/station, null if none.
seqnum SeedLink sequence number of last packet received,
-1 to start at the next data.
timestamp SeedLink time stamp in a UTCDateTime format
for last packet received, null for none.