Make sure the bridge doesn't crash (and crashloop) it the token is invalid

src/discordas.ts

@@ -214,20 +214,34 @@ async function run(): Promise<void> {
 
     roomhandler.bindThirdparty();
 
+    try {
+        await startDiscordBot(discordbot);
+        log.info("Discordbot started successfully");
+    } catch (err) {
+        log.error(err);
+        log.error("Failure during startup. Exiting");
+        process.exit(1);
+    }
+
     await appservice.begin();
     log.info(`Started listening on port ${port}`);
 
+}
+
+async function startDiscordBot(discordbot: DiscordBot, falloffSeconds = 5) {
     try {
         await discordbot.init();
         await discordbot.run();
-        log.info("Discordbot started successfully");
     } catch (err) {
-        log.error(err);
-        log.error("Failure during startup. Exiting");
-        process.exit(1);
+        // no more than 5 minutes
+        const newFalloffSeconds = Math.min(falloffSeconds * 2, 5 * 60);
+        log.error(`Failed do start Discordbot: ${err.code}. Will try again in ${newFalloffSeconds} seconds`);
+        await new Promise((r, _) => setTimeout(r, newFalloffSeconds * 1000));
+        return startDiscordBot(discordbot, newFalloffSeconds);
     }
 }
 
+
 run().catch((err) => {
     log.error("A fatal error occurred during startup:", err);
     process.exit(1);