Main Speedify SDK calls.

The main interface to the Speedify SDK for Desktop/Embedded
For all methods that take a callback, specifying a callback of NULL will perform synchronous calls. If your specify a callback, this method will not block and your callback will be called from another thread.
Methods marked 'Supports Subscription' support subscribing to updates for that result. Return true from the callback to continue receiving updates. Return false to stop. The result object returned from these methods includes an eventId that can be used to disable further updates;
Methods marked 'Subscription Only' must be given a callback.