In the default "time" form of pyepics, if PVs are not ready when running add_callback(self._callback, with_ctrlvars=True), pv.get_ctrlvars() and with_ctrlvars=True cannot take effect, and subsequent callback of pyepics will not contain metadata when PVs are back online.
In the default "time" form of pyepics, if PVs are not ready when running
add_callback(self._callback, with_ctrlvars=True),pv.get_ctrlvars()andwith_ctrlvars=Truecannot take effect, and subsequent callback of pyepics will not contain metadata when PVs are back online.