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The first thing an APP needs to do is to open a WebSocket connection with a HAS server. Once connected, the HAS will send a
connectedmessage with additional information.
timeout: delay (in seconds) before the server considers requests to be expired. The default value is 60 seconds.
version: HAS code version
protocol: HAS protocol version
An application should decline to connect to a HAS infrastructure whose protocol version is greater than the one it supports.