Merge pull request #451 from mtconnect/431_websockets_subscriptions #308

Job	Run time
MacOS Latest, Shared: True	26m 49s
Ubuntu Latest, Shared: True	22m 32s
MacOS Latest, Shared: False	28m 39s
Windows 2019 Arch: x86, Shared: False	39m 27s
Ubuntu Latest, Shared: False	24m 23s
Windows 2019 Arch: amd64, Shared: True	46m 38s
Windows 2019 Arch: amd64, Shared: False	44m 7s
	3h 52m 35s

Provide feedback