The KNX Backbone Key has a length of 128 bits, so written as a hexadecimal number that yields 32 digits. This fix thus replaces "numbers" with "digits" in the `invalid_backbone_key` message.
The KNX Backbone Key has a length of 128 bits, so written as a hexadecimal number that yields 32 digits. This fix thus replaces "numbers" with "digits" in the `invalid_backbone_key` message.