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I think gazebo would react to a service call, not to a parameter change on the parameter server

maybe try using the

rosservice call /gazebo/set_physics_properties

and copy the current properties that you get with

rosservice call /gazebo/get_physics_properties

something like

rosservice call /gazebo/set_physics_properties "time_step: 0.001
max_update_rate: 1000.0
gravity: 
  x: 0.0
  y: 0.0
  z: 0.0
ode_config: 
  auto_disable_bodies: False
  sor_pgs_precon_iters: 0
  sor_pgs_iters: 50
  sor_pgs_w: 1.3
  sor_pgs_rms_error_tol: 0.0
  contact_surface_layer: 0.001
  contact_max_correcting_vel: 100.0
  cfm: 0.0
  erp: 0.2
  max_contacts: 100"