I want to get Apple Watch unique id or UDID. Is there anything available like UDID or unique identifier?
How to get Apple Watch Unique id or UDID programmatically?
Ray Wenderlich's site has a tutorial called "How to Install iOS 9 and watchOS 2" and it has a "Using Xcode to Get Your Device’s UUID" section.
Not programmatically, no.
There is an equivalent for identifierForVendor in watchOS that can be used to generate a unique ID.
if let uuid = WKInterfaceDevice.current().identifierForVendor?.uuidString {
print("UUID is",uuid)
}