Add deviceSelectionMode to MicrobitWebUSBConnectionOptions

[microbit-grace]

Added a new configuration (deviceSelectionMode) for how a device should be selected.

DeviceSelectionMode.AlwaysAsk - Attempts to connect to known device, otherwise asks which device to connect with.
DeviceSelectionMode.UseAnyAllowed - Attempts to connect to known device, otherwise attempts to connect with any allowed devices. If that fails, asks which device to connect with.

[cloudflare-workers-and-pages]

Deploying microbit-connection with    Cloudflare Pages

Latest commit:	909da96
Status:	✅  Deploy successful!
Preview URL:	https://220f96b2.microbit-connection.pages.dev
Branch Preview URL:	https://device-connect-mode.microbit-connection.pages.dev

View logs

[microbit-matt-hillsdon]

Added some comments.

What are/should be the consequences for the bluetooth connection?

[microbit-grace]

Thanks for the comments.

What are/should be the consequences for the bluetooth connection?

I assume no consequence for bluetooth connection since we are only changing the WebUSB device fallback behaviour.

For radio connection, if the MicrobitWebUSBConnection is configured as DeviceFallbackMode.AllowedOrSelect, the micro:bit would automatically try to connect to allowed devices and if successful, would establish radio connection without having the user to select a device. I think this behaviour matches the expectation of the configuration applied. By default, MicrobitWebUSBConnection is configured as DeviceFallbackMode.Select which is more explicit in terms of what device is selected. That seems like a good default to me.

Not sure if I have missed something.

[microbit-matt-hillsdon]

Minor comments and a final suggestion re name, but happy to discuss. I think it's worth the effort for something others might use.

[microbit-matt-hillsdon]

I assume no consequence for bluetooth connection since we are only changing the WebUSB device fallback behaviour.

Yeah I guess I was pondering whether it should have similar logic as there's a similar notion of already having permitted access to a device. But I think fine to leave for now.