Connecting Hc-05 with iPhone Se iOS(V11.0)

How do I set services and characteristics for HM-10 BLE on Arduino Uno?

that's not how it works. The HM10 has the characteristics and services that you need build in and communicates
with your Arduino trough the RX and TX pins.

You need the softserial library to create an extra serial connection.

Also consider that most HM10 devices are only 3.3 volt compatible and need a level shifter to work with your Arduino!
On the other hand I connect the RX to TX and TX to RX without level shifter without a problem, but thats your risk.

Connect your TX and RX pins of your softserial port to the TX and RX pins on your HM10 device.
Create a sketch for your Arduino that can read and write to your softserial connection and you are done.

Setup your Xamarin application as BLE-client.

On the Xamarin forms application your application has to find the device,

connect to the device by getting the services,

select the service you need(for my HM10 it is 0000ffe0-0000-1000-8000-00805f9b34fb),

get the characteristics of the selected services, select the characteristic you need(for my HM10 it is 0000ffe1-0000-1000-8000-00805f9b34fb),

write the ClientCharacteristicConfigurationDescriptor to the characteristic to be able to receive notifications.

If you send a message from your Arduino(CHAR or BYTE-array wit a maximum of 20 bytes), your application can receive
it in notifications.
If you write a message from your application you can read it in Arduino.

To understand the work flow of the Xamarin application have a look at my example on Github:https://github.com/GrooverFromHolland/SimpleBleExample_by_Devicename

It is not a Xamarin example but a Universal Windows BleExample, only to show what is needed to setup a connection.

If you have a problem with the example, create an issue on my Github page.

For other questions use the comments here.

The run destination iOS Device is not valid for running the scheme

It was a bug in XCode, I closed and reopened Xcode and it started working.

I've noticed this sort of thing many many times now with Xcode with other problems, its very frustrating that the tool is so dodgy.

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