Cannot unsubscribe with application client

[myke239]

I'm having an issue unsubscribing from a previously submitted subscription.
I've configured my app client exactly how it is described in the documentation.

var Client = require('ibmiotf');
var appClient = new Client.IotfApplication(config);

and subscribed to events
appClient.subscribeToDeviceEvents("+",deviceId,"+");

and listen for events
appClient.on("deviceEvent", function (deviceType, deviceId, eventType, format, payload) {
this.payload = payload.toString('utf8');
});

but when I try to unsubscribe to events with any of the following

appClient.unsubscribeToDeviceEvents();
appClient.unsubscribeToDeviceEvents(type, id, evt, format);
appClient.unsubscribe(topic);
appClient.unsubscribe();

I still continue to receive messages from the original subscription.

I'm running node v9.11.1

Is it me or a bug in the BaseClient or ApplicationClient ??

[icraggs]

I just tried this combination:

appClient.subscribeToDeviceEvents("+", deviceid, "+");

and then:

appClient.unsubscribeToDeviceEvents("+", deviceid, "+");

and that combination worked.

[durera]

Closing as stale/no followup since @icraggs response last year.