* add poll_value service
* switch vol.All to vol.Schema
* more relevant log message
* switch service name to refresh_value, add parameter to refresh all watched values, fix tests
* rename parameter and create task for polling command so we don't wait for a response
* raise ValueError for unknown entity
* better error message
* fix test
* Add entry setup and unload test
* Test home assistant stop
* Test on connect and on disconnect
* Test client connect timeout
* Test ready node added
* Test non ready node added
* Test existing node not ready
* Test device registry state
* Add common test tools module
* Add existing ready node test
* Include init module in coverage calculation
* Clean docstrings