message: Make xxx_setpoint properties read-only
diff: @@ -115,10 +115,10 @@ public:
  make_protocol_property("input_pos", &input_pos_),
  make_protocol_property("input_vel", &input_vel_),
  make_protocol_property("input_current", &input_current_),
  - make_protocol_property("pos_setpoint", &pos_setpoint_),
  - make_protocol_property("vel_setpoint", &vel_setpoint_),
  - make_protocol_property("vel_integrator_current", &vel_integrator_current_),
  - make_protocol_property("current_setpoint", &current_setpoint_),
  + make_protocol_ro_property("pos_setpoint", &pos_setpoint_),
  + make_protocol_ro_property("vel_setpoint", &vel_setpoint_),
  + make_protocol_ro_property("vel_integrator_current", &vel_integrator_current_),
  + make_protocol_ro_property("current_setpoint", &current_setpoint_),
  make_protocol_object("config",
  make_protocol_property("control_mode", &config_.control_mode),
  make_protocol_property("input_mode", &config_.input_mode),
  