Self explanatory…
When I call simulation_context.render() clock is advanced :( I do not expect that though, clock should increase at complete step/phyisics step.
NOTE: it is published correctly only when ticked.
Seemingly, this is also explained in the clock.py example. However, it would be nice to have the option to tick it manullay.
However, I might suggest to add this in the clock/rosbridge init command as ppl might want to step clock with the physics (as sensors like imu should publish with the physics step not the render).