Fix Peripheral state not updating upon connection

[burnhamd]

References issue #290

Found issue where if the device is disconnected and delegate does not return a didDisconnect callback on IOS (for example when bluetooth is turned off) that the state flow would stay in connecting and never show connected in the peripheral side during reconnect.

This fixes that by using shared flow instead of state flow

[twyatt]

Sorry, I don't follow how using a SharedFlow vs. a StateFlow would fix the issue?

[burnhamd]

Sorry, I don't follow how using a SharedFlow vs. a StateFlow would fix the issue?

It took us a while to figure this one out. So after the change which disconnects the peripherals in the event that bluetooth is powered off, the connectionState would remain in the previous state and not change. This would result in the peripheral state being DISCONNECTED, and the ConnectionState still having the most recent state emitted. Then once you call a connect on the peripheral, the peripheral state would change to connected, but the ConnectionState would not emit again because the state was the same as before.

So changing to a shared flow ensures that the ConnectionState emits even if it is the same value as before.

[twyatt]

Thanks @burnhamd! Great investigative work to figure out the problem and fix! 💯

[davertay-j]

LGTM, thank you @burnhamd