Handle software version being None when setting up HomeKit accessories (#54130)

* Convert all HomeKit service info to string prior to checking for max length

* Added check for None software version

* Added test case for numeric version number

* Update tests/components/homekit/test_accessories.py

Co-authored-by: J. Nick Koston <nick@koston.org>

* Fix style & none version test

* Fix test

* revert other change since it should be covered by the format_sw_version fix

Co-authored-by: J. Nick Koston <nick@koston.org>

homeassistant/components/homekit/accessories.py

@@ -238,9 +238,10 @@ class HomeAccessory(Accessory):
             model = self.config[ATTR_MODEL]
         else:
             model = domain.title()
+        sw_version = None
         if self.config.get(ATTR_SW_VERSION) is not None:
             sw_version = format_sw_version(self.config[ATTR_SW_VERSION])
-        else:
+        if sw_version is None:
             sw_version = __version__
 
         self.set_info_service(

tests/components/homekit/test_accessories.py

@@ -133,6 +133,39 @@ async def test_home_accessory(hass, hk_driver):
     )
     assert serv.get_characteristic(CHAR_FIRMWARE_REVISION).value == "0.4.3"
 
+    acc4 = HomeAccessory(
+        hass,
+        hk_driver,
+        "Home Accessory that exceeds the maximum maximum maximum maximum maximum maximum length",
+        entity_id2,
+        3,
+        {
+            ATTR_MODEL: "Awesome Model that exceeds the maximum maximum maximum maximum maximum maximum length",
+            ATTR_MANUFACTURER: "Lux Brands that exceeds the maximum maximum maximum maximum maximum maximum length",
+            ATTR_SW_VERSION: "will_not_match_regex",
+            ATTR_INTEGRATION: "luxe that exceeds the maximum maximum maximum maximum maximum maximum length",
+        },
+    )
+    assert acc4.available is False
+    serv = acc4.services[0]  # SERV_ACCESSORY_INFO
+    assert (
+        serv.get_characteristic(CHAR_NAME).value
+        == "Home Accessory that exceeds the maximum maximum maximum maximum "
+    )
+    assert (
+        serv.get_characteristic(CHAR_MANUFACTURER).value
+        == "Lux Brands that exceeds the maximum maximum maximum maximum maxi"
+    )
+    assert (
+        serv.get_characteristic(CHAR_MODEL).value
+        == "Awesome Model that exceeds the maximum maximum maximum maximum m"
+    )
+    assert (
+        serv.get_characteristic(CHAR_SERIAL_NUMBER).value
+        == "light.accessory_that_exceeds_the_maximum_maximum_maximum_maximum"
+    )
+    assert serv.get_characteristic(CHAR_FIRMWARE_REVISION).value == hass_version
+
     hass.states.async_set(entity_id, "on")
     await hass.async_block_till_done()
     with patch(