climate: zone/central mode state from status frames only

custom_components/myhome/gateway_events.py

@@ -45,7 +45,7 @@
     LOGGER,
 )
 from .topology import peer_handles_who
-from .where_grammar import is_central_thermo_where, is_probe, where_param
+from .where_grammar import is_central_unit_report, is_probe, where_param
 
 if TYPE_CHECKING:
     from .gateway import MyHOMEGatewayHandler
@@ -306,7 +306,7 @@ async def process_message(self, message: Any) -> None:
             or isinstance(message, OWNHeatingEvent)
         ):
             if not message.is_translation:
-                if isinstance(message, OWNHeatingEvent) and is_central_thermo_where(message):
+                if isinstance(message, OWNHeatingEvent) and is_central_unit_report(message):
                     self.handler.has_central_unit = True
                 if isinstance(message, OWNLightingEvent) and self._is_active_for_who(1):
                     if (

custom_components/myhome/strings.json

@@ -600,6 +600,15 @@
     "fan_speed_zone_only": {
       "message": "{name} has no fan speed of its own: only a zone (1-99) takes one"
     },
+    "auto_standalone_zone": {
+      "message": "{name} is a standalone thermostat: the central unit has no program for it"
+    },
+    "zone_heat_in_conditioning_season": {
+      "message": "{name} follows the central unit, which is in the conditioning season: change the season on the central unit"
+    },
+    "zone_cool_in_heating_season": {
+      "message": "{name} follows the central unit, which is in the heating season: change the season on the central unit"
+    },
     "command_delivery_cancelled": {
       "message": "{name}: direction command delivery was cancelled before reaching the bus"
     },

custom_components/myhome/translations/en.json

@@ -600,6 +600,15 @@
     "fan_speed_zone_only": {
       "message": "{name} has no fan speed of its own: only a zone (1-99) takes one"
     },
+    "auto_standalone_zone": {
+      "message": "{name} is a standalone thermostat: the central unit has no program for it"
+    },
+    "zone_heat_in_conditioning_season": {
+      "message": "{name} follows the central unit, which is in the conditioning season: change the season on the central unit"
+    },
+    "zone_cool_in_heating_season": {
+      "message": "{name} follows the central unit, which is in the heating season: change the season on the central unit"
+    },
     "command_delivery_cancelled": {
       "message": "{name}: direction command delivery was cancelled before reaching the bus"
     },

custom_components/myhome/translations/fr.json

@@ -536,6 +536,15 @@
     "fan_speed_zone_only": {
       "message": "{name} n'a pas de vitesse de ventilation propre : seule une zone (1-99) peut en avoir une"
     },
+    "auto_standalone_zone": {
+      "message": "{name} est un thermostat autonome : la centrale n'a pas de programme pour lui"
+    },
+    "zone_heat_in_conditioning_season": {
+      "message": "{name} suit la centrale, qui est en saison de climatisation : changez la saison sur la centrale"
+    },
+    "zone_cool_in_heating_season": {
+      "message": "{name} suit la centrale, qui est en saison de chauffage : changez la saison sur la centrale"
+    },
     "command_delivery_cancelled": {
       "message": "{name} : l'envoi de la commande de direction a été annulé avant d'atteindre le bus"
     },

custom_components/myhome/translations/it.json

@@ -536,6 +536,15 @@
     "fan_speed_zone_only": {
       "message": "{name} non ha una velocità del ventilatore propria: solo una zona (1-99) può averne una"
     },
+    "auto_standalone_zone": {
+      "message": "{name} è un termostato autonomo: la centrale non ha un programma per esso"
+    },
+    "zone_heat_in_conditioning_season": {
+      "message": "{name} segue la centrale, che è nella stagione di condizionamento: cambia la stagione sulla centrale"
+    },
+    "zone_cool_in_heating_season": {
+      "message": "{name} segue la centrale, che è nella stagione di riscaldamento: cambia la stagione sulla centrale"
+    },
     "command_delivery_cancelled": {
       "message": "{name}: l'invio del comando di direzione è stato annullato prima di raggiungere il bus"
     },

custom_components/myhome/translations/nl.json

@@ -536,6 +536,15 @@
     "fan_speed_zone_only": {
       "message": "{name} heeft geen eigen ventilatorsnelheid: alleen een zone (1-99) kan er een krijgen"
     },
+    "auto_standalone_zone": {
+      "message": "{name} is een zelfstandige thermostaat: de centrale heeft er geen programma voor"
+    },
+    "zone_heat_in_conditioning_season": {
+      "message": "{name} volgt de centrale, die in het koelseizoen staat: wijzig het seizoen op de centrale"
+    },
+    "zone_cool_in_heating_season": {
+      "message": "{name} volgt de centrale, die in het stookseizoen staat: wijzig het seizoen op de centrale"
+    },
     "command_delivery_cancelled": {
       "message": "{name}: de aflevering van het richtingscommando is geannuleerd voordat het de bus bereikte"
     },

custom_components/myhome/where_grammar.py

@@ -201,6 +201,7 @@ def _sound_step_delta(self: Any) -> int | None:
     "is_actuator_where",
     "is_apl_address",
     "is_central_thermo_where",
+    "is_central_unit_report",
     "is_probe",
     "is_pump",
     "is_valid_hs_tuple",
@@ -290,6 +291,34 @@ def is_central_thermo_where(message: Any) -> bool:
     return raw.startswith("#") and head.isdigit() and not is_probe(head)
 
 
+# Zone operation mode by central unit with its season (WHO 4 p. 65, 1.9.4; p. 9): 110 / 210
+# manual, 111 / 211 automatic, 103 / 203 off, 102 / 202 protection. The generic 310 / 311
+# (p. 9 lists them on the monitor session too) are also the command text, and an F455
+# makes up *4*311*#Z## for a standalone thermostat; the live 3550 reported its zone 4 as
+# *4*210*#4##, also in its quarter-hour push, so a central unit is still found.
+_CENTRAL_ZONE_STATUS_WHATS = frozenset({"110", "210", "111", "211", "103", "203", "102", "202"})
+
+
+def is_central_unit_report(message: Any) -> bool:
+    """Whether a WHO=4 frame shows that the plant has a central unit.
+
+    ``#0`` and ``#0#N`` are the central unit itself (WHO 4 p. 6, p. 64). A ``#Z`` frame counts
+    when it is a dimension or a zone status with its season (WHO 4 p. 65). A generic one does
+    not: an F455 puts ``*4*311*#2##`` on its event session after every status of a standalone
+    thermostat, on a plant with or without a central unit (live, 2026-11-08).
+    """
+    if not is_central_thermo_where(message):
+        return False
+    raw = str(getattr(message, "where", None) or "").strip().removeprefix("4-")
+    if raw.removeprefix("#").split("#", 1)[0] == "0":
+        return True
+    frame = str(message)
+    if not frame.startswith("*4*"):
+        return True
+    what = frame.split("*")[2].split("#", 1)[0]
+    return what in _CENTRAL_ZONE_STATUS_WHATS
+
+
 def canonical_point_spelling(where: str) -> str:
     """``0004`` -> ``04``, silently; anything else as typed.