How to get mavros gps satellite number and gps time via mavlink?
Hi, I'm studying mavros and px4.
My OS and ROS version is Ubuntu 16.04, Kinetic, and PX4 is very recent stable version.
I need to record quadcopter gps and position data,
and I succeed with subscribe latitude, longitude, and altitude.
But I really don't know what topic has data about
GPS time, and visible GPS satellite number(Or PRN Code).
Any advice is welcome, and I'm sorry for my short English. I'm not English user, usually :)