M8-R15: fix HA discovery identities and thermal totals

tests/test_mqtt_client.py

@@ -257,7 +257,7 @@ def test_publish_passes_topic_payload_retain_to_paho() -> None:
         manager._connected = True
         manager._client = mock_client
 
-    manager.publish("test/topic", '{"key": "value"}', retain=True, qos=1)
+    assert manager.publish("test/topic", '{"key": "value"}', retain=True, qos=1) is True
 
     mock_client.publish.assert_called_once_with(
         "test/topic", payload='{"key": "value"}', qos=1, retain=True
@@ -267,8 +267,7 @@ def test_publish_passes_topic_payload_retain_to_paho() -> None:
 def test_publish_is_noop_when_not_connected() -> None:
     manager = MqttManager()
     # No connect — should silently skip
-    manager.publish("topic", "payload", retain=False)
-    # No exception raised
+    assert manager.publish("topic", "payload", retain=False) is False
 
 
 def test_publish_does_not_raise_on_paho_error() -> None:
@@ -279,7 +278,17 @@ def test_publish_does_not_raise_on_paho_error() -> None:
     manager._connected = True
 
     # Must not raise
-    manager.publish("topic", "payload")
+    assert manager.publish("topic", "payload") is False
+
+
+def test_publish_returns_false_when_paho_rejects_message() -> None:
+    manager = MqttManager()
+    mock_client = MagicMock()
+    mock_client.publish.return_value.rc = 1
+    manager._client = mock_client
+    manager._connected = True
+
+    assert manager.publish("topic", "payload") is False
 
 
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