When <seecref="P:IoTSharp.Data.DeviceIdentity.IdentityType"/> Is <seecref="F:IoTSharp.Data.IdentityType.AccessToken"/> ,this is a Token.
When <seecref="P:IoTSharp.Data.DeviceIdentity.IdentityType"/> Is <seecref="F:IoTSharp.Data.IdentityType.DevicePassword"/> ,this is a device name.
When <seecref="P:IoTSharp.Data.DeviceIdentity.IdentityType"/> Is <seecref="F:IoTSharp.Data.IdentityType.X509Certificate"/> ,this is X509 Certificate' Fingerprint.
When <seecref="P:IoTSharp.Data.DeviceIdentity.IdentityType"/> Is <seecref="F:IoTSharp.Data.IdentityType.AccessToken"/> ,this is null.
When <seecref="P:IoTSharp.Data.DeviceIdentity.IdentityType"/> Is <seecref="F:IoTSharp.Data.IdentityType.DevicePassword"/> ,this is a password.
When <seecref="P:IoTSharp.Data.DeviceIdentity.IdentityType"/> Is <seecref="F:IoTSharp.Data.IdentityType.X509Certificate"/> ,this is X509 Certificate' PEM.