This ROS node listen sensor_msgs/TimeReference
and send it to ntpd via SHM (like gpsd).
Parameter ~/shm_unit
define SHM unit (in ntp.conf) (int, default: 2).
Parameter ~/time_ref
define the topic to subscribe to (string, default: "~/time_ref").
Add this to /etc/ntp.conf
:
### GPS SHM driver
server 127.127.28.2 minpoll 4 maxpoll 4
fudge 127.127.28.2 time1 0.5 stratum 12 refid ROS
And then restart ntp service.
Run example:
rosrun ntpd_driver shm_driver _shm_unit:=2 _time_ref:=/mavros/time_reference
Add this to /etc/chrony/chrony.conf
:
### SHM driver
refclock SHM 0 delay 0.5 refid ROS stratum 12
And then restart chrony service.
Run example:
rosrun ntpd_driver shm_driver _shm_unit:=0 _time_ref:=/mavros/time_reference