dodal connect cannot selectively mock devices when device_factory has been configured to mock specific devices

[DiamondJoseph]

On p38 we have a selection of devices that we always want to be backed by simulated backends: optical components that are a clone of the setup on i22 so the output of the beamline can be representative of the output on i22.

When we use dodal connect, we can pass True or False for the --sim-backend argument- which then overrules what configuration has been set on the beamline module.

Acceptance Criteria

• On p38 we can have devices that should be mocked by default
• When dodal connect is called for p38 with no argument to --sim-backend, the devices that should be mocked by default are connected to mock backends, and other devices connect to real backends
• There is exactly one documented way to achieve this behaviour

[DominicOram]

On p38 we can have devices that should be mocked by default

I thought this was the point of being able to do @device_factory(mock=True)?

When dodal connect is called for p38 with no argument to --sim-backend, the devices that should be mocked by default are connected to mock backends, and other devices connect to real backends

I wouldn't be adverse to removing --sim-backend I don't see a strong use-case for it

[DiamondJoseph]

Yep, those devices have device_factory(mock=True), but that value is never checked when using make_all_devices.