pub(crate) const USAGE: &str = "usage: bobview-testioc [--only ea|motor|cam]...
Serves the example-services BL01T PVs over Channel Access and PV Access.
Honours EPICS_CA_SERVER_PORT and the other EPICS_CA(S)_* variables, and
EPICS_PVAS_SERVER_PORT / EPICS_PVAS_BROADCAST_PORT and the other
EPICS_PVA(S)_* variables.";