This library isn't just a wrapper around MQTT.js for angular >= 2. It uses observables and takes care of subscription handling and message routing.
For reasons of convenience, I removed the copied typings from mqtt.js and added it as a dev-dependency while still bundling the browserified latest version of it.
This means although you have the possibility to use
wxs as the protocol in the client options, you can't, because this is a browser library where you can't conntect with something other than websockets. You also can't use
ca for the same reasons.
If you have any issues using this library, please visit it's homepage and look for similar issues in the issue tracker before you file a bug.