Support Sit(X) Websockets

[CoryFoy]

This is a follow-up to #65 which is currently using the API PLI Post method. Ideally we can also use Websocket connections to stream data two-ways. We may want to offer both options in an advanced setting since the POST method is likely to use less battery life due to not maintaining an open connection at all times.

Per the Sit(X) Documentation, the websocket URL is of the form https://<subdomain>.takserver.parteamconnect.com/<group-id>