diff --git a/src/locutus.ts b/src/locutus.ts
index 5a8e2dc..b021184 100644
--- a/src/locutus.ts
+++ b/src/locutus.ts
@@ -29,6 +29,18 @@ export class App {
         this.handleUrl(document.URL);
     }
 
+    close() {
+        if (this.session) this.session.close();
+    }
+
+    sleep() {
+        if (this.session) this.session.sleep();
+    }
+
+    async wakeup() {
+        if (this.session) await this.session.wakeup();
+    }
+
     setHash(hash: string) {
         const url = new URL(document.URL);
         url.hash = hash;
@@ -244,8 +256,8 @@ export class App {
             }
         });
 
-        this.session.subscribe(response => {
-            this.addMessage(response.data.data.message);
+        this.session.subscribe(event => {
+            this.addMessage(event.data.message);
         });
     }
 }
diff --git a/src/main.ts b/src/main.ts
index a525990..ed6248b 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -7,5 +7,32 @@ window.addEventListener("DOMContentLoaded", () => {
     for (const noscript of document.getElementsByTagName("noscript")) {
         noscript.remove();
     }
-    new Locutus.App();
+
+    const locutus = new Locutus.App();
+    if (isMobilePlatform()) {
+        console.log("MOBILE");
+        document.addEventListener("visibilitychange", () => {
+            if (document.visibilityState === 'hidden') {
+                locutus.sleep();
+            } else if (document.visibilityState === 'visible') {
+                locutus.wakeup().then();
+            }
+        });
+    } else {
+        console.log("DESKTOP");
+        window.addEventListener("beforeunload", (evt) => {
+            locutus.close();
+        });
+    }
 });
+
+function isMobilePlatform(): boolean {
+    if (window.matchMedia("(any-pointer:coarse)").matches) return true;
+    const ua = navigator.userAgent;
+    if (/(tablet|ipad|playbook|silk)|(android(?!.*mobi))/i.test(ua)) {
+        return true;
+    } else if (/Mobile|Android|iP(hone|od)|IEMobile|BlackBerry|Kindle|Silk-Accelerated|(hpw|web)OS|Opera M(obi|ini)/.test(ua)) {
+        return true;
+    }
+    return false;
+}
diff --git a/src/usimp.ts b/src/usimp.ts
index da72a4a..3e9d17a 100644
--- a/src/usimp.ts
+++ b/src/usimp.ts
@@ -30,6 +30,13 @@ interface OutputEnvelopeJson {
     } | null,
 }
 
+interface EventJson {
+    data: {
+        message: string,
+    }
+    uuid: string,
+}
+
 interface WellKnownJson {
     domain: DomainJson,
     domain_servers: DomainServerJson[]
@@ -149,6 +156,7 @@ export class Session {
     websocket: WebSocket | null;
     numRequests: number;
     subscriptions: string[];
+    subscriptionEndpoints: {cb: (a: EventJson) => void}[];
 
     constructor(domain: Domain) {
         this.domain = domain;
@@ -158,6 +166,28 @@ export class Session {
         this.httpBaseUrl = null;
         this.websocket = null;
         this.subscriptions = [];
+        this.subscriptionEndpoints = [];
+    }
+
+    close() {
+        if (this.websocket && (this.websocket.readyState !== WebSocket.CLOSING && this.websocket.readyState !== WebSocket.CLOSED)) {
+            this.websocket.close();
+            this.subscriptions = [];
+            this.websocket = null;
+            this.server = null;
+        }
+    }
+
+    sleep() {
+        this.close();
+    }
+
+    async wakeup() {
+        await this.chooseDomainServer();
+        await this.ping();
+        for (const endpoint of this.subscriptionEndpoints) {
+            await this._subscribe(endpoint.cb);
+        }
     }
 
     async chooseDomainServer(): Promise<{ http: number | null, ws: number | null } | undefined> {
@@ -289,7 +319,7 @@ export class Session {
                         responseData.duration = endTime - startTime;
                         return responseData;
                     } else {
-                        return null;  // TODO subscription id
+                        return await this.waitForWebSocketResponse(req_nr, timeout);
                     }
                 } else if (this.httpBaseUrl) {
                     const controller = new AbortController();
@@ -369,25 +399,36 @@ export class Session {
         });
     }
 
-    async subscribe(cb: (a: OutputEnvelopeJson) => void) {
+    async subscribe(cb: (a: EventJson) => void) {
+        this.subscriptionEndpoints.push({cb: cb});
+        await this._subscribe(cb);
+    }
+
+    private async _subscribe(cb: (a: EventJson) => void) {
         this.numRequests++;
         if (this.websocket !== null) {
-            let subscription = await this.send('subscribe', {}, 60_000, false, cb);
+            const subscription = await this.send('subscribe', {}, 60_000, false, (res) => {
+                if (res.data && res.data.events) {
+                    for (const event of res.data.events) {
+                        cb(event);
+                    }
+                }
+            });
             this.subscriptions.push(subscription);
             return subscription;
         } else {
             this.send('subscribe', {}, 60_000).then((res) => {
                 if (res.status === "success") {
-                    this.subscribe(cb);
+                    this._subscribe(cb);
                     cb(res);
                 } else {
                     setTimeout(() => {
-                        this.subscribe(cb);
+                        this._subscribe(cb);
                     }, 1000);
                 }
             }).catch(() => {
                 setTimeout(() => {
-                    this.subscribe(cb);
+                    this._subscribe(cb);
                 }, 1000);
             });
             return null;  // TODO subscription id