Set slave default to 0, as already documented in Modbus #66921
Merged
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Breaking change
Proposed change
The documentation (and the code expects) slave to be 0 is not positively added to configuration.yaml, we depended on the pymodbus library to secure this, however there are cases where this is not done.
To secure consistency a default = 0 is added to the optional "slave" attribute.
The tests needed to be updated, since the config dicts (used to setup the tests) are not passing voluptuous and thus the default is not set.
Type of change
Additional information
This PR contains a schema change, so it should not be added to a dot release (even though the change makes no difference seen from a user POW).
Documentation already states that slave is 0 by default.
Checklist
black --fast homeassistant tests
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