Ensure connection with peers after going offline (#297)

* Redial relay node on failure and after going offline

* Redial only relay node if not connected

* Refactor and rename methods

* Only close existing connection to relay node

* Hearbeat check only for relay node

* Refactor startHeartbeatCheck method

packages/peer-test-app/src/App.tsx

@@ -14,6 +14,7 @@ declare global {
   interface Window {
     broadcast: (message: string) => void;
     flood: (message: string) => void;
+    peer: Peer;
   }
 }
 
@@ -28,6 +29,9 @@ function App() {
       return
     }
 
+    // For debugging
+    window.peer = peer;
+
     // Subscribe to messages from remote peers
     const unsubscribeMessage = peer.subscribeMessage((peerId, message) => {
       console.log(`${peerId.toString()} > ${message}`)