Support for BBMD messages and COV pushing#127

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adam-nielsen wants to merge 11 commits intofh1ch:masterfrom

adam-nielsen:bbmd

Commits on Feb 12, 2019

fix(transport): Correctly handle messages from non-standard BACnet port numbers
adam-nielsen
committed

Commits on Mar 28, 2019

fix(client): Default to a hop count of 255 rather than 0
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feat(client): Add helper function for constructing a bit string
adam-nielsen
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feature(client): Add helper function to convert enum into string
adam-nielsen
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feat(client): add support for interfacing with, and acting as, a BBMD device
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feat(client): add confirmedCOVNotification() for pushing changes to subscribers
adam-nielsen
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refactor(client): Remove 'broadcast' from naming of iAm and iHave functions
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fix(client): Respond to message errors as unicast not broadcast
adam-nielsen
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fix(client): Make confirmedCOV function use sendBvlc
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fix(tests): Update property name
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fix(client): Address PR feedback
adam-nielsen
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