return new Observable<any>((subscriber: Subscriber<any>) => {
   try {
     subscriber.error(this.transform(error));
   } catch (err) {
     subscriber.error(error);
   }
 });

 adapter.open(openOptions, (error) => {
   if (error) {
     obs.error(error);
     return;
   }
   obs.next(adapter);
   obs.complete();
 });

 adapter.disconnect(device.instanceId, (err) => {
   if (err) {
     obs.error(new DisconnectError(err, device));
     return;
   }
   obs.next();
   obs.complete();
 });

 adapter.readCharacteristicValue(characteristic.instanceId, (err, value) => {
   if (err) {
     obs.error(new ReadCharacteristicError(err, characteristic));
     return;
   }
   obs.next(toHexString(value));
   obs.complete();
 });

 adapter.getCharacteristics(service.instanceId, (err, chars) => {
   if (err) {
     obs.error(new CharacteristicDiscoveryError(err, service));
     return;
   }
   obs.next(chars);
   obs.complete();
 });

 adapter.getServices(device.instanceId, (err, services) => {
   if (err) {
     obs.error(new ServiceDiscoveryError(err, device));
     return;
   }
   obs.next(services);
   obs.complete();
 });

 this.import(data, (d, e) => {
   if (e) {
     sub.error(e);
   } else {
     sub.next(d);
     sub.complete();
   }
 });

			request(url, params, (err: Error, response: IncomingMessage, body: any) => {
				if (err) {
					return subscriber.error(err);
				}

				Request.recentResponse = response;
				subscriber.next(body);
				subscriber.complete();
			});