Connection status callback #58
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This patch adds an optional "status_callback" parameter to the connection options. This callback is called with a single boolean parameter indicating the connection status only when the state changes (i.e. it does not repeatedly fire with "false" when a connection attempt fails).
If your code relies on the websocket connection for major functionality, this provides a means to give feedback to the user and/or client code if the connection is lost. I'm open to other ideas to achieve this goal, but this seemed like the simplest and most flexible way to get there.