diff --git a/package.json b/package.json
index 94ba206..2ce8d7d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "arduino-iot-js",
-  "version": "0.13.0",
+  "version": "0.14.0",
   "license": "GPLv3",
   "description": "JS module providing Arduino Create IoT Cloud Connection",
   "main": "./lib/index.js",
diff --git a/src/builder/IArduinoIoTCloudFactory.ts b/src/builder/IArduinoIoTCloudFactory.ts
index 035cc67..8095162 100644
--- a/src/builder/IArduinoIoTCloudFactory.ts
+++ b/src/builder/IArduinoIoTCloudFactory.ts
@@ -8,6 +8,6 @@ export type CloudFactoryOptions = (APIOptions | CredentialsOptions | BrowserOpti
 
 export interface IArduinoIoTCloudFactory {
   connect(options: APIOptions & Partial<CloudOptions>): Promise<IMultiPropertiesCloudClient>;
-  connect(options: CredentialsOptions & Partial<CloudOptions>): Promise<ISinglePropertyCloudClient>;
   connect(options: BrowserOptions & Partial<CloudOptions>): Promise<IMultiPropertiesCloudClient>;
+  connect(options: CredentialsOptions & Partial<CloudOptions>): Promise<ISinglePropertyCloudClient>;
 }
diff --git a/src/client/BaseCloudClient.ts b/src/client/BaseCloudClient.ts
index 0a9cff7..0789c9d 100644
--- a/src/client/BaseCloudClient.ts
+++ b/src/client/BaseCloudClient.ts
@@ -63,12 +63,14 @@ export class BaseCloudClient<T extends IConnection = IConnection> implements ICl
       if (err) throw new Error(`subscription failed: ${err.toString()}`);
 
       subscription = this.connection.messages.pipe(filter((v) => v.topic === topic)).subscribe((v) => subject.next(v));
+      this.options.onConnected();
     });
 
     const originalMethod = subject.unsubscribe;
     subject.unsubscribe = () => {
       subscription.unsubscribe();
       originalMethod();
+      this.options.onDisconnect();
     };
 
     return subject;
diff --git a/src/client/SinglePropertyCloudClient.ts b/src/client/SinglePropertyCloudClient.ts
index f76aa4a..acdc308 100644
--- a/src/client/SinglePropertyCloudClient.ts
+++ b/src/client/SinglePropertyCloudClient.ts
@@ -31,7 +31,6 @@ export class SinglePropertyCloudClient extends BaseCloudClient implements ISingl
       return;
     }
 
-    console.log('found association to thing:', thingId);
     this.thingId = thingId;
     if (this.onThingResponse) this.onThingResponse(thingId);
     this.subscription = this.observe(`/a/t/${this.thingId}/e/i`).subscribe((v) => {
diff --git a/src/senML/index.ts b/src/senML/index.ts
index f668a4f..296127b 100644
--- a/src/senML/index.ts
+++ b/src/senML/index.ts
@@ -102,9 +102,9 @@ export function format(value: CloudMessageValue, name: string, timestamp: number
     parsed.bn = `urn:uuid:${deviceId}`;
   }
 
-  if (Utils.isNumber(value)) parsed.v = value;
-  if (Utils.isString(value)) parsed.vs = value;
-  if (Utils.isBoolean(value)) parsed.vb = value;
+  if (Utils.isNumber(value)) parsed.v = Number(value);
+  if (Utils.isString(value)) parsed.vs = String(value);
+  if (Utils.isBoolean(value)) parsed.vb = Boolean(value);
 
   return parsed;
 }
diff --git a/src/utils/index.ts b/src/utils/index.ts
index aaf9e10..fc092e4 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -11,24 +11,28 @@ export class ArduinoCloudError extends Error {
   }
 }
 
+export function isNil(value: unknown): value is undefined | null {
+  return value === undefined || value == null;
+}
+
 export function isObject(value: CloudMessageValue): value is object {
-  return value && typeof value === 'object';
+  return !isNil(value) && typeof value === 'object';
 }
 
 export function isNumber(value: CloudMessageValue): value is number {
-  return value && typeof value === 'number';
+  return !isNil(value) && typeof value === 'number';
 }
 
 export function isString(value: CloudMessageValue): value is string {
-  return value && typeof value === 'string';
+  return !isNil(value) && typeof value === 'string';
 }
 
 export function isBoolean(value: CloudMessageValue): value is boolean {
-  return value && typeof value === 'boolean';
+  return !isNil(value) && typeof value === 'boolean';
 }
 
 export function isArray<T>(value: CloudMessageValue): value is T[] {
-  return value && Array.isArray(value);
+  return !isNil(value) && Array.isArray(value);
 }
 
 export function isNotAnEmptyObject(value: any): boolean {