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Update base image to latest version of Raspbian (based on Debian Stretch)
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Fix "initial message" bug that occasionally resulted in absurdly high bufferReferenceTime values.
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Add intermittent server pinging. (This fixes dropped connections bug when server is hosted on AWS, and makes the disconnection–reconnection updates below possible.)
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Improve how disconnection–reconnection gets handled, and improve feedback to the user when connection to server is lost.