Add support for ESPHome dashboard discovery (#4084)

supervisor/discovery/services/esphome.py

@@ -0,0 +1,9 @@
+"""Discovery service for the ESPHome Dashboard."""
+import voluptuous as vol
+
+from ...validate import network_port
+from ..const import ATTR_HOST, ATTR_PORT
+
+SCHEMA = vol.Schema(
+    {vol.Required(ATTR_HOST): str, vol.Required(ATTR_PORT): network_port}
+)

tests/discovery/test_esphome.py

@@ -0,0 +1,25 @@
+"""Test ESPHome Dashboard discovery."""
+
+import pytest
+import voluptuous as vol
+
+from supervisor.discovery.validate import valid_discovery_config
+
+
+def test_good_config():
+    """Test good ESPHome config."""
+
+    valid_discovery_config("esphome", {"host": "test", "port": 6052})
+
+
+def test_bad_config():
+    """Test bad ESPHome config."""
+
+    with pytest.raises(vol.Invalid):
+        valid_discovery_config("esphome", {"host": "test"})
+
+    with pytest.raises(vol.Invalid):
+        valid_discovery_config("esphome", {"port": 6052})
+
+    with pytest.raises(vol.Invalid):
+        valid_discovery_config("esphome", {"port": -1})