[openthread] Backport address resolution support to prevent OTA crash

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

esphome/const.py

@@ -696,6 +696,7 @@ CONF_OPEN_DRAIN = "open_drain"
 CONF_OPEN_DRAIN_INTERRUPT = "open_drain_interrupt"
 CONF_OPEN_DURATION = "open_duration"
 CONF_OPEN_ENDSTOP = "open_endstop"
+CONF_OPENTHREAD = "openthread"
 CONF_OPERATION = "operation"
 CONF_OPTIMISTIC = "optimistic"
 CONF_OPTION = "option"

esphome/core/__init__.py

@@ -11,6 +11,7 @@ from esphome.const import (
     CONF_COMMENT,
     CONF_ESPHOME,
     CONF_ETHERNET,
+    CONF_OPENTHREAD,
     CONF_PORT,
     CONF_USE_ADDRESS,
     CONF_WEB_SERVER,
@@ -641,6 +642,9 @@ class EsphomeCore:
         if CONF_ETHERNET in self.config:
             return self.config[CONF_ETHERNET][CONF_USE_ADDRESS]
 
+        if CONF_OPENTHREAD in self.config:
+            return f"{self.name}.local"
+
         return None
 
     @property

tests/unit_tests/test_core.py

@@ -570,6 +570,13 @@ class TestEsphomeCore:
 
         assert target.address == "4.3.2.1"
 
+    def test_address__openthread(self, target):
+        target.name = "test-device"
+        target.config = {}
+        target.config[const.CONF_OPENTHREAD] = {}
+
+        assert target.address == "test-device.local"
+
     def test_is_esp32(self, target):
         target.data[const.KEY_CORE] = {const.KEY_TARGET_PLATFORM: "esp32"}