ColdObservable.swift

let timer = Observable<Int>.interval(1, scheduler: MainScheduler.instance)
                
timer.subscribeNext {
            print("First Subscription: \($0)")
        }
        
delay(2) {
    timer.subscribeNext {
            print("Second Subscription: \($0)")
        }
}

//First Subscription: 0
//First Subscription: 1
//First Subscription: 2
//Second Subscription: 0
//First Subscription: 3
//Second Subscription: 1
//First Subscription: 4
//Second Subscription: 2
//..
//..