All clocks in the sfptpd PTP slave server can be stepped at any
time using the sfptpdctl utility.
Clocks will be stepped, forwards or backwards, into the same second period as the parent clock.
When clocks are stepped, entries similar to the following are generated in the
sfptpd
message log or stats_log:
# sfptpdctl stepclocks
notice: received 'stepclocks' control command: stepping clocks to current offset
info: clock phc0: applying offset 0.288991267 seconds
info: clock phc1: applying offset 1.376286052 seconds
info: clock system: applying offset 0.380292621 seconds