TimeSequencer using system clock instead of node clock

[ichatzinikolaidis]

Hi,

I noticed that TimeSequencer is using the system clock (both here and in the definition of last_time_) instead of the node's clock. Could this be problematic when running a simulation? Shouldn't it use the node's clock, which can be configured to use either sim time or system time by setting the use_sim_time parameter?

[MichaelOrlov]

It seems to support sim_time need to use clock from the underlying node.
However, @mjcarroll needs to clarify.