c</li>
<li>API calls and other &ldquo;cold observables&rdquo;</li>
<li>Network Reachability</li>
<li>Navigation through the app (Redux Coordinator pattern)</li>
<li><code>CoreBluetooth</code> central or peripheral manager</li>
<li><code>CoreNFC</code> manager and delegate</li>
<li><code>NotificationCenter</code> and other delegates</li>
<li>WebSocket, TCP Socket, Multipeer and many other connectivity protocols</li>
<li><code>RxSwift</code> observables, <code>ReactiveSwift</code> signal producers, <code>Comb