diff --git a/src/mqtt.ts b/src/mqtt.ts
index eb84b8ed2..60bca03a7 100644
--- a/src/mqtt.ts
+++ b/src/mqtt.ts
@@ -9,6 +9,7 @@ import DefaultMessageIdProvider from './lib/default-message-id-provider'
 import UniqueMessageIdProvider from './lib/unique-message-id-provider'
 import Store, { IStore } from './lib/store'
 import connect, { connectAsync } from './lib/connect'
+import PingTimer from './lib/PingTimer'
 
 export const Client = MqttClient
 export {
@@ -19,6 +20,7 @@ export {
 	DefaultMessageIdProvider,
 	UniqueMessageIdProvider,
 	IStore,
+	PingTimer,
 }
 export * from './lib/client'
 export * from './lib/shared'
diff --git a/test/abstract_client.ts b/test/abstract_client.ts
index 78983bc04..64e19d0e2 100644
--- a/test/abstract_client.ts
+++ b/test/abstract_client.ts
@@ -3112,7 +3112,7 @@ export default function abstractTest(server, config, ports) {
 						client.end(true)
 					}
 				})
-				let client = connect({ reconnectPeriod: 100 })
+				let client = connect({ reconnectPeriod: 200 })
 				let serverPublished = false
 				let clientCalledBack = false
 
@@ -3125,7 +3125,7 @@ export default function abstractTest(server, config, ports) {
 						})
 					})
 
-					// after 100ms the client should reconnect
+					// after 200ms the client should reconnect
 					server.once('client', (serverClientNew) => {
 						serverClientNew.on('publish', () => {
 							serverPublished = true
@@ -3195,7 +3195,7 @@ export default function abstractTest(server, config, ports) {
 					}
 				})
 
-				let client = connect({ reconnectPeriod: 100 })
+				let client = connect({ reconnectPeriod: 200 })
 				let serverPublished = false
 				let clientCalledBack = false
 
diff --git a/test/browser/test.js b/test/browser/test.js
index c81595ceb..3365f0407 100644
--- a/test/browser/test.js
+++ b/test/browser/test.js
@@ -94,10 +94,16 @@ describe('MQTT.js browser tests', () => {
 
 	it('should work in a Web Worker', (done) => {
 		const worker = new Worker('test/browser/worker.js')
+		let ready = false
 		worker.onmessage = (e) => {
 			if (e.data === 'worker ready') {
+				ready = true
+			} else if(e.data === 'keepalive'){
+				worker.onerror = null
+				// worker.terminate()
+				expect(ready).to.be.true
 				done()
-			} else {
+			 }else {
 				done(Error(e.data))
 			}
 		}
diff --git a/test/browser/worker.js b/test/browser/worker.js
index e3cdcee3b..ef271487e 100644
--- a/test/browser/worker.js
+++ b/test/browser/worker.js
@@ -1,10 +1,14 @@
 importScripts('/dist/mqtt.js');
 
-/** @type { import('../../src').MqttClient }*/
+/** @type { import('../../src') }*/
 const MQTT = mqtt;
 
+console.log('worker start');
+console.log('worker MQTT', MQTT);
+
 const client = MQTT.connect(`ws://localhost:4000`, {
     clientId: `testClient-worker_` + Math.random().toString(16).substr(2, 8),
+    keepalive: 2,
 });
 
 client.on('offline', () => {
@@ -19,10 +23,18 @@ client.on('error', (err) => {
     console.log('worker client error', err);
 })
 
+client.on('packetsend', (packet) => {
+    if (packet.cmd === 'pingreq') {
+        postMessage('keepalive');
+        client.end(() => {
+            console.log('worker client end');
+
+        });
+    }
+})
+
 client.on('connect', () => {
     console.log('worker client connect');
-    client.end(() => {
-        console.log('worker client end');
-        postMessage('worker ready');
-    });
+    postMessage('worker ready');
+
 })
\ No newline at end of file