Allow for timestamps of other types than float#173

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christiansandberg merged 2 commits intocanopen-python:masterfrom

Sandyman:master

Dec 2, 2019

Commits on Dec 2, 2019

In stead of assigning 0 directly to a timestamp member, make it None, then check whether it exists before doing the subtraction. This way, we can potentially use other types for the timestamp, as l…
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Only update period when we have received two timestamps.
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