Request and read packet timestamps

[Georacer]

If I read the code correctly, you stamp the ROS topics with the current system time, using the C++ clock_gettime.

Is there a reason you use the local system time instead of the packet timestamp (when that is available)?

[ZdenekM]

You are right. And no - there is no special reason for that and it is not correct. Feel free to open a pull request improving this.

[Georacer]

Okay, just wanted to have a sanity check. Thanks!