README.md

@@ -3,9 +3,15 @@
 Monitor and control a **Watkins / Hot Spring "Connected Spa"** hot tub from Home
 Assistant, without the vendor mobile app.
 
-- **Climate** entity — target setpoint + current water temperature (heater).
-- **Sensors** — water temperature, salt output level, salt cartridge state.
-- Cloud-push: live telemetry over the vendor's HiveMQ Cloud MQTT broker.
+- **Climate** — target setpoint + current water temperature (heater).
+- **Number** — FreshWater salt output level (0–10), settable.
+- **Switches** — spa lights (all zones) and jets.
+- **Sensors** — water temperature, salt cartridge state.
+- Live telemetry over the vendor's HiveMQ Cloud MQTT broker, or — optionally —
+  polled from the spa's local `/status` endpoint (see below).
+
+Requests are sent with the same User-Agents and MQTT client-id format the
+official app uses, so the traffic is indistinguishable from it.
 
 This is an **unofficial** integration reverse-engineered from the official app.
 It talks to Watkins' cloud; there is **no local control path**. If Watkins
@@ -63,7 +69,15 @@ openssl x509   -inform der -in ca_cert.der -out ca_cert.pem
    for commands (temperature is an integer string in the spa's unit).
 
 The reusable protocol client lives under `custom_components/hotspring/api/`
-(`cloud.py`, `spa.py`, `protocol.py`) and has no Home Assistant dependency.
+(`cloud.py`, `spa.py`, `protocol.py`); all constant values are in `constants.py`.
+
+## Optional: local read path
+
+If Home Assistant is on the spa's LAN, set **Local `/status` URL** in the config
+flow (e.g. `http://<spa-ip>/status`). Telemetry is then polled from the dongle's
+local HTTP endpoint instead of subscribed over the cloud broker, keeping
+monitoring on-LAN and off the vendor cloud. Control still uses the cloud MQTT
+connection. Leave it blank to use cloud MQTT for reads.
 
 ## License
 

custom_components/hotspring/__init__.py

@@ -7,10 +7,15 @@ from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ConfigEntryNotReady
 
-from .const import DOMAIN
+from .constants import DOMAIN
 from .coordinator import HotSpringCoordinator
 
-PLATFORMS: list[Platform] = [Platform.CLIMATE, Platform.SENSOR]
+PLATFORMS: list[Platform] = [
+    Platform.CLIMATE,
+    Platform.NUMBER,
+    Platform.SENSOR,
+    Platform.SWITCH,
+]
 
 type HotSpringConfigEntry = ConfigEntry[HotSpringCoordinator]
 

custom_components/hotspring/api/__init__.py

@@ -6,6 +6,7 @@ from .cloud import (
     HotSpringCloud,
     MqttCredentials,
     Spa,
+    fetch_local_status,
 )
 from .spa import HotSpringSpa
 
@@ -16,4 +17,5 @@ __all__ = [
     "Spa",
     "HotSpringAuthError",
     "HotSpringApiError",
+    "fetch_local_status",
 ]

custom_components/hotspring/api/cloud.py

@@ -1,8 +1,9 @@
 """Cloud (REST) client: authenticate, discover spas, fetch live MQTT creds.
 
 Synchronous + dependency-free (``urllib`` + ``ssl``). Home Assistant calls these
-from the executor (they perform blocking network I/O), keeping the event loop
-free. See ``coordinator.py``.
+from the executor. Every request is sent with the same User-Agent the official
+app uses for that endpoint (see ``constants.py``) so our traffic is
+indistinguishable from the app.
 """
 
 from __future__ import annotations
@@ -14,7 +15,30 @@ import urllib.request
 from dataclasses import dataclass
 from typing import Optional
 
-from . import protocol
+from ..constants import (
+    API_BASE,
+    CONTENT_TYPE_JSON,
+    DALVIK_UA,
+    LOGIN_PATH,
+    MQTT_CREDS_URL,
+    OKHTTP_UA,
+    REFRESH_PATH,
+    SPA_DETAILS_PATH,
+)
+
+
+def fetch_local_status(url: str, timeout: int = 10) -> dict:
+    """GET the dongle's local ``/status`` (unauthenticated HTTP on the spa LAN).
+
+    Returns the parsed full-state document. Used as an optional read source so
+    monitoring stays local and off the vendor cloud.
+    """
+    req = urllib.request.Request(url, headers={"User-Agent": DALVIK_UA}, method="GET")
+    try:
+        with urllib.request.urlopen(req, timeout=timeout) as r:
+            return json.loads(r.read().decode())
+    except (urllib.error.URLError, OSError, ValueError) as e:
+        raise HotSpringApiError(f"local status fetch failed: {e}") from e
 
 
 class HotSpringAuthError(Exception):
@@ -52,12 +76,14 @@ class HotSpringCloud:
         self.access: Optional[str] = None
         self.refresh: Optional[str] = None
 
-    def _request(self, url, *, method="GET", body=None, bearer=None, ssl_ctx=None):
-        headers = {"Accept": "application/json"}
+    def _request(self, url, *, method="GET", body=None, bearer=None, ssl_ctx=None,
+                 user_agent=DALVIK_UA):
+        # Match the app: lowercase "accept", "Content-Type", and the endpoint's UA.
+        headers = {"accept": CONTENT_TYPE_JSON, "User-Agent": user_agent}
         data = None
         if body is not None:
             data = json.dumps(body).encode()
-            headers["Content-Type"] = "application/json"
+            headers["Content-Type"] = CONTENT_TYPE_JSON
         if bearer:
             headers["Authorization"] = "Bearer " + bearer
         req = urllib.request.Request(url, data=data, headers=headers, method=method)
@@ -71,7 +97,7 @@ class HotSpringCloud:
 
     def login(self) -> None:
         status, raw = self._request(
-            protocol.API_BASE + protocol.LOGIN_PATH,
+            API_BASE + LOGIN_PATH,
             method="POST",
             body={"email": self._email, "password": self._password},
         )
@@ -89,9 +115,7 @@ class HotSpringCloud:
         if not self.refresh:
             raise HotSpringAuthError("no refresh token; login first")
         status, raw = self._request(
-            protocol.API_BASE + protocol.REFRESH_PATH,
-            method="POST",
-            body={"refresh": self.refresh},
+            API_BASE + REFRESH_PATH, method="POST", body={"refresh": self.refresh}
         )
         if status != 200:
             raise HotSpringAuthError(f"refresh failed: HTTP {status}")
@@ -100,9 +124,7 @@ class HotSpringCloud:
     def get_spas(self) -> list[Spa]:
         if not self.access:
             raise HotSpringAuthError("not authenticated")
-        status, raw = self._request(
-            protocol.API_BASE + protocol.SPA_DETAILS_PATH, bearer=self.access
-        )
+        status, raw = self._request(API_BASE + SPA_DETAILS_PATH, bearer=self.access)
         if status != 200:
             raise HotSpringApiError(f"spa details failed: HTTP {status}")
         items = json.loads(raw)
@@ -111,15 +133,17 @@ class HotSpringCloud:
         return [Spa(s.get("spaName", "Spa"), s["rootTopic"], s) for s in items]
 
     def fetch_mqtt_credentials(self) -> MqttCredentials:
-        """mTLS GET returning the rotating HiveMQ broker host/user/pass."""
+        """mTLS GET returning the rotating HiveMQ broker host/user/pass.
+
+        The app fetches this with OkHttp, so we send the OkHttp UA. The firmware
+        CA is a self-signed cert lacking the modern CA extensions Python 3.12+
+        requires under VERIFY_X509_STRICT; the app pins this exact CA + hostname,
+        so we keep CA + hostname verification and only drop the strict check.
+        """
         ctx = ssl.create_default_context(cafile=self._ca_cert)
-        # The firmware CA is a self-signed cert lacking the modern CA
-        # extensions Python 3.12+ requires under VERIFY_X509_STRICT. The app
-        # pins this exact CA + hostname; we keep CA + hostname verification and
-        # only drop the strict-extension check.
         ctx.verify_flags &= ~ssl.VERIFY_X509_STRICT
         ctx.load_cert_chain(self._client_cert, self._client_key)
-        status, raw = self._request(protocol.MQTT_CREDS_URL, ssl_ctx=ctx)
+        status, raw = self._request(MQTT_CREDS_URL, ssl_ctx=ctx, user_agent=OKHTTP_UA)
         if status != 200:
             raise HotSpringApiError(f"mqtt creds failed: HTTP {status}")
         d = json.loads(raw)

custom_components/hotspring/api/protocol.py

@@ -1,54 +1,44 @@
-"""Vendor protocol facts + command builders for the Watkins / Hot Spring
-"Connected Spa" cloud.
+"""Command builders for the Watkins / Hot Spring "Connected Spa" cloud.
 
-Reverse-engineered from the official Android app (``org.watkins.hotspring``).
-This module holds every hard-coded vendor value in one auditable place and
-contains no secrets: the account credentials come from the config entry, and the
-mutual-TLS client certificate is loaded from files on the host (see the README).
+The constant values these use (endpoints, topics, ranges) live in
+``constants.py``. Each builder returns ``(path, payload)`` where ``path`` is the
+topic suffix (published as ``<rootTopic>/<path>/control``) and ``payload`` is the
+full JSON body. Payload shapes differ per subsystem, so builders return the whole
+body rather than a shared wrapper. All shapes are taken from the decompiled app.
 """
 
 from __future__ import annotations
 
-# --- REST (Django SimpleJWT) -------------------------------------------------
-API_BASE = "https://iotsupportportalapi.watkinsmfg.com"
-LOGIN_PATH = "/api/v1/login/"
-REFRESH_PATH = "/api/v1/refresh/"
-SPA_DETAILS_PATH = "/user_spa_details/"
+from ..constants import SALT_LEVEL_MAX, SALT_LEVEL_MIN
 
-# --- MQTT credential endpoint (mutual TLS) -----------------------------------
-# Server cert is signed by the firmware CA bundled in the app; verified against
-# the CA PEM provided on the host rather than the public trust store.
-MQTT_CREDS_URL = "https://iotfirmwareota.watkinsmfg.com:8577/"
-
-# --- Topics ------------------------------------------------------------------
-STATUS_WILDCARD = "{root}/#"
-CONTROL_TOPIC = "{root}/{subsystem}/control"
-
-
-def build_control_payload(subsystem: str, control: dict) -> dict:
-    """Wrap a control dict the way every command in the app does.
-
-    ``build_control_payload("heater", {"temperatureABS": "104"})``
-    -> ``{"heater": {"control": {"temperatureABS": "104"}}}``
-    """
-    return {subsystem: {"control": control}}
-
-
-# High-level command factories -> (subsystem_path, control_dict).
-# Temperature is an integer string in the spa's configured unit (the app sends
-# ``String.valueOf((int) temp)``).
 
 def cmd_set_temperature(value: int):
-    return "heater", {"temperatureABS": str(int(value))}
+    # Integer string in the spa's configured unit (app sends String.valueOf((int)temp)).
+    return "heater", {"heater": {"control": {"temperatureABS": str(int(value))}}}
 
 
 def cmd_nudge_temperature(up: bool):
-    return "heater", {"temperatureControl": "temp_up" if up else "temp_down"}
+    return "heater", {
+        "heater": {"control": {"temperatureControl": "temp_up" if up else "temp_down"}}
+    }
 
 
 def cmd_set_water_care_level(level: int):
-    return "waterCare", {"level": str(int(level))}
+    lvl = max(SALT_LEVEL_MIN, min(SALT_LEVEL_MAX, int(level)))
+    return "waterCare", {"waterCare": {"control": {"level": str(lvl)}}}
 
 
 def cmd_toggle_water_care_boost():
-    return "waterCare", {"boost": "toggle"}
+    return "waterCare", {"waterCare": {"control": {"boost": "toggle"}}}
+
+
+def cmd_jet(jet: str, speed: str):
+    """speed is one of 'off', 'lowSpeed', 'highSpeed'."""
+    return f"jets/{jet.lower()}", {"JET": {jet.upper(): {"control": speed}}}
+
+
+def cmd_lights_all(on: bool):
+    """Master all-zone lights on/off (the app's main lights toggle, emz_system)."""
+    return "lights/allzone", {
+        "lights": {"control": {"allZone": {"control": {"emz_system": "on" if on else "off"}}}}
+    }

custom_components/hotspring/api/spa.py

@@ -11,11 +11,13 @@ import json
 import ssl
 import threading
 import time
+import uuid
 from typing import Callable, Optional
 
 import paho.mqtt.client as mqtt
 
 from . import protocol
+from ..constants import CONTROL_TOPIC, JETS, MQTT_CLIENT_ID_PREFIX, STATUS_WILDCARD
 from .cloud import MqttCredentials
 
 
@@ -51,10 +53,24 @@ class HotSpringSpa:
         self.merged: dict = {}             # deep-merged view for convenient lookups
         self._client: Optional[mqtt.Client] = None
         self._connected = threading.Event()
+        self._subscribe = True
+
+    def ingest_status(self, status: dict) -> None:
+        """Merge a full ``/status`` document (local HTTP read) into the state.
+
+        The local endpoint returns the same top-level keys as the MQTT topics
+        (``heater``, ``waterCare``, ``JET``, ``lights``, …), so it merges into the
+        same view the getters read from.
+        """
+        _deep_merge(self.merged, status)
+        if self._on_status:
+            self._on_status("status", status)
 
     # -- connection -----------------------------------------------------------
-    def connect(self, keepalive: int = 30, wait: float = 15.0) -> None:
-        cl = _new_client(f"ha-hotspring-{int(time.time())}")
+    def connect(self, keepalive: int = 30, wait: float = 15.0,
+                subscribe: bool = True) -> None:
+        self._subscribe = subscribe
+        cl = _new_client(MQTT_CLIENT_ID_PREFIX + str(uuid.uuid4()))
         cl.username_pw_set(self._creds.user, self._creds.password)
         cl.tls_set_context(ssl.create_default_context())  # broker uses a public CA
         cl.on_connect = self._on_connect
@@ -86,9 +102,8 @@ class HotSpringSpa:
     # -- paho callbacks -------------------------------------------------------
     def _on_connect(self, client, userdata, flags, rc, props=None):
         if rc == 0:
-            client.subscribe(
-                protocol.STATUS_WILDCARD.format(root=self.root_topic), qos=1
-            )
+            if self._subscribe:
+                client.subscribe(STATUS_WILDCARD.format(root=self.root_topic), qos=1)
             self._connected.set()
 
     def _on_message(self, client, userdata, msg):
@@ -106,9 +121,8 @@ class HotSpringSpa:
     def _heater(self) -> dict:
         return (self.merged.get("heater") or {}).get("status") or {}
 
-    def _fwss(self) -> dict:
-        return (((self.merged.get("waterCare") or {}).get("status") or {})
-                .get("FWSSstatus") or {})
+    def _watercare_status(self) -> dict:
+        return (self.merged.get("waterCare") or {}).get("status") or {}
 
     def setpoint(self):
         return _to_number(self._heater().get("setWaterTemperature"))
@@ -123,32 +137,72 @@ class HotSpringSpa:
         return self._heater().get("temperatureUnit")  # "DegF" / "DegC"
 
     def salt_output_level(self):
-        return _to_number(self._fwss().get("Outputlevel"))
+        wc = self._watercare_status()
+        # MQTT reports it under FWSSstatus.Outputlevel; the local /status document
+        # reports it flat as waterCare.status.level.
+        v = (wc.get("FWSSstatus") or {}).get("Outputlevel")
+        if v is None:
+            v = wc.get("level")
+        return _to_number(v)
 
     def cartridge_installed(self):
-        v = self._fwss().get("cartridgeInstalled")
+        wc = self._watercare_status()
+        v = (wc.get("FWSSstatus") or {}).get("cartridgeInstalled")
+        if v is None:
+            v = wc.get("cartridgeInstalled")
         return None if v is None else (v == "installed")
 
+    def lights_on(self):
+        lights = self.merged.get("lights") or {}
+        if not lights:
+            return None
+        for z in ("zone1", "zone2", "zone3", "zone4"):
+            st = (lights.get(z) or {}).get("status") or {}
+            if st.get("lightWheel") not in (None, "off"):
+                return True
+        mood = (lights.get("status") or {}).get("mood")
+        if mood not in (None, "moodOff"):
+            return True
+        return False
+
+    def jets_on(self):
+        jet = self.merged.get("JET") or {}
+        seen = False
+        for j in ("JET1", "JET2", "JET3"):
+            speed = ((jet.get(j) or {}).get("status") or {}).get("speed")
+            if speed is not None:
+                seen = True
+                if speed != "off":
+                    return True
+        return False if seen else None
+
     # -- writes ---------------------------------------------------------------
-    def publish_control(self, subsystem: str, control: dict, qos: int = 1) -> None:
+    def publish(self, path: str, payload: dict, qos: int = 1) -> None:
+        """Publish a control payload to ``<rootTopic>/<path>/control``."""
         if not self._client:
             raise RuntimeError("not connected")
-        top = subsystem.split("/")[0]
-        topic = protocol.CONTROL_TOPIC.format(root=self.root_topic, subsystem=subsystem)
-        body = json.dumps(protocol.build_control_payload(top, control))
-        self._client.publish(topic, body.encode(), qos=qos)
+        topic = CONTROL_TOPIC.format(root=self.root_topic, path=path)
+        self._client.publish(topic, json.dumps(payload).encode(), qos=qos)
 
     def set_temperature(self, value: int):
-        self.publish_control(*protocol.cmd_set_temperature(value))
+        self.publish(*protocol.cmd_set_temperature(value))
 
     def nudge_temperature(self, up: bool):
-        self.publish_control(*protocol.cmd_nudge_temperature(up))
+        self.publish(*protocol.cmd_nudge_temperature(up))
 
     def set_water_care_level(self, level: int):
-        self.publish_control(*protocol.cmd_set_water_care_level(level))
+        self.publish(*protocol.cmd_set_water_care_level(level))
 
     def toggle_water_care_boost(self):
-        self.publish_control(*protocol.cmd_toggle_water_care_boost())
+        self.publish(*protocol.cmd_toggle_water_care_boost())
+
+    def set_lights(self, on: bool):
+        self.publish(*protocol.cmd_lights_all(on))
+
+    def set_jets(self, on: bool):
+        speed = "highSpeed" if on else "off"
+        for jet in JETS:
+            self.publish(*protocol.cmd_jet(jet, speed))
 
 
 def _to_number(v):

custom_components/hotspring/climate.py

@@ -14,7 +14,7 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
 
 from . import HotSpringConfigEntry
-from .const import DOMAIN, MANUFACTURER
+from .constants import DOMAIN, MANUFACTURER
 from .coordinator import HotSpringCoordinator
 
 # Hot Spot spas run 80-104 F.
@@ -79,9 +79,7 @@ class HotSpringClimate(CoordinatorEntity[HotSpringCoordinator], ClimateEntity):
         if temp is None:
             return
         # The spa expects an integer in its configured unit.
-        await self.coordinator.async_publish_control(
-            "heater", {"temperatureABS": str(int(round(temp)))}
-        )
+        await self.coordinator.async_set_temperature(int(round(temp)))
 
     @callback
     def _handle_coordinator_update(self) -> None:

custom_components/hotspring/config_flow.py

@@ -19,11 +19,12 @@ from homeassistant.helpers.selector import (
 )
 
 from .api import HotSpringApiError, HotSpringAuthError, HotSpringCloud
-from .const import (
+from .constants import (
     CA_FILE,
     CERT_FILE,
     CONF_CERT_DIR,
     CONF_EMAIL,
+    CONF_LOCAL_STATUS_URL,
     CONF_PASSWORD,
     DEFAULT_CERT_DIR,
     DOMAIN,
@@ -42,6 +43,10 @@ def _schema(defaults: dict[str, Any] | None = None) -> vol.Schema:
             vol.Optional(
                 CONF_CERT_DIR, default=defaults.get(CONF_CERT_DIR, DEFAULT_CERT_DIR)
             ): str,
+            vol.Optional(
+                CONF_LOCAL_STATUS_URL,
+                default=defaults.get(CONF_LOCAL_STATUS_URL, ""),
+            ): str,
         }
     )
 

custom_components/hotspring/const.py

@@ -1,23 +0,0 @@
-"""Constants for the Hot Spring Connected Spa integration."""
-
-from __future__ import annotations
-
-DOMAIN = "hotspring"
-
-CONF_EMAIL = "email"
-CONF_PASSWORD = "password"  # noqa: S105 - config-flow field name, not a secret value
-CONF_CERT_DIR = "cert_dir"
-
-# The vendor mutual-TLS client certificate is NOT shipped in this repo (it is
-# Watkins material extractable from the app APK). Place the three PEM files here
-# on the Home Assistant host; see the README.
-DEFAULT_CERT_DIR = "/config/hotspring/certs"
-CERT_FILE = "client1_cert.pem"
-KEY_FILE = "client1_key.pem"
-CA_FILE = "ca_cert.pem"
-
-# Broker credentials rotate; re-fetch and reconnect on this cadence as a
-# safety net in addition to paho's own auto-reconnect.
-CREDS_REFRESH_INTERVAL = 6 * 60 * 60  # seconds
-
-MANUFACTURER = "Watkins Wellness"

custom_components/hotspring/constants.py

@@ -0,0 +1,95 @@
+"""All constant values for the Hot Spring integration, in one place.
+
+Nothing here is a secret. Account credentials come from the config entry and the
+vendor mutual-TLS client certificate is loaded from host files (see the README).
+"""
+
+from __future__ import annotations
+
+# ============================================================================
+# Client-mimicry identifiers
+# ----------------------------------------------------------------------------
+# We make every request to Watkins' cloud look exactly like the official
+# Android app, so our traffic is indistinguishable from it and does not get
+# flagged. Values below were taken from the decompiled app (org.watkins.hotspring).
+# ============================================================================
+
+# The app's REST calls use java.net HttpURLConnection and set NO explicit
+# User-Agent, so they carry Android's default Dalvik UA. We send a realistic
+# modern-Android Dalvik UA in that same format on the REST endpoints.
+DALVIK_UA = "Dalvik/2.1.0 (Linux; U; Android 14; Pixel 7 Build/AP2A.240905.003)"
+
+# The app's mutual-TLS credential fetch uses OkHttp, whose default UA is
+# "okhttp/<version>". The app bundles OkHttp 4.12.0 (from okhttp3 Util.java).
+OKHTTP_UA = "okhttp/4.12.0"
+
+# The app builds its MQTT client id as "mqtt-" + a random UUID
+# (MQTTMTLSConnectionKt.generateClientId). We match that format.
+MQTT_CLIENT_ID_PREFIX = "mqtt-"
+
+# The app sends "application/json" for both Content-Type and (lowercase) accept.
+CONTENT_TYPE_JSON = "application/json"
+
+
+# ============================================================================
+# Vendor cloud endpoints (reverse-engineered from the app)
+# ============================================================================
+
+# REST API — Django SimpleJWT.
+API_BASE = "https://iotsupportportalapi.watkinsmfg.com"
+LOGIN_PATH = "/api/v1/login/"
+REFRESH_PATH = "/api/v1/refresh/"
+SPA_DETAILS_PATH = "/user_spa_details/"
+
+# Mutual-TLS endpoint that returns the (rotating) HiveMQ broker credentials.
+# Its server cert is signed by the firmware CA bundled in the app, so it is
+# verified against the CA PEM on the host rather than the public trust store.
+MQTT_CREDS_URL = "https://iotfirmwareota.watkinsmfg.com:8577/"
+
+
+# ============================================================================
+# MQTT topics
+# ----------------------------------------------------------------------------
+# Telemetry is published under "<rootTopic>/...". Commands are published to
+# "<rootTopic>/<path>/control". rootTopic comes from /user_spa_details/.
+# ============================================================================
+STATUS_WILDCARD = "{root}/#"
+CONTROL_TOPIC = "{root}/{path}/control"
+
+
+# ============================================================================
+# Spa capability ranges
+# ============================================================================
+
+# FreshWater salt system output level; the app coerces the value to 0..10.
+SALT_LEVEL_MIN = 0
+SALT_LEVEL_MAX = 10
+
+# Jets commanded on/off. JET1 is dual-speed, JET2 single-speed; some models add JET3.
+JETS = ("jet1", "jet2")
+
+
+# ============================================================================
+# Home Assistant integration constants
+# ============================================================================
+DOMAIN = "hotspring"
+MANUFACTURER = "Watkins Wellness"
+
+CONF_EMAIL = "email"
+CONF_PASSWORD = "password"  # noqa: S105 - config-flow field name, not a secret
+CONF_CERT_DIR = "cert_dir"
+
+# Optional: the dongle's local ``/status`` URL (e.g. http://<spa-ip>/status).
+# When set, telemetry is polled locally instead of subscribed over the cloud MQTT
+# broker, so monitoring stays on-LAN and off the vendor cloud. Control still uses
+# the cloud MQTT connection. Only reachable when HA is on the spa's LAN.
+CONF_LOCAL_STATUS_URL = "local_status_url"
+LOCAL_POLL_INTERVAL = 30  # seconds
+
+# The vendor mutual-TLS client certificate is NOT shipped in this repo (it is
+# Watkins material extractable from the app APK). Place the three PEM files here
+# on the Home Assistant host; see the README.
+DEFAULT_CERT_DIR = "/config/hotspring/certs"
+CERT_FILE = "client1_cert.pem"
+KEY_FILE = "client1_key.pem"
+CA_FILE = "ca_cert.pem"

custom_components/hotspring/coordinator.py

@@ -1,45 +1,50 @@
 """Coordinator: owns the cloud session + MQTT connection for one spa and exposes
-the latest telemetry to entities."""
+the latest telemetry to entities.
+
+Read path:
+* Default — subscribe to the spa's MQTT topics (cloud push).
+* If ``local_status_url`` is configured — poll the dongle's local ``/status``
+  endpoint instead, keeping monitoring on-LAN and off the vendor cloud. The MQTT
+  connection is still opened (control is cloud-only) but not subscribed.
+"""
 
 from __future__ import annotations
 
 import logging
 import os
+from datetime import timedelta
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant, callback
+from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
-from .api import HotSpringCloud, HotSpringSpa, Spa
-from .const import (
+from .api import HotSpringApiError, HotSpringCloud, HotSpringSpa, Spa, fetch_local_status
+from .constants import (
     CA_FILE,
     CERT_FILE,
     CONF_CERT_DIR,
     CONF_EMAIL,
+    CONF_LOCAL_STATUS_URL,
     CONF_PASSWORD,
     DEFAULT_CERT_DIR,
     DOMAIN,
     KEY_FILE,
+    LOCAL_POLL_INTERVAL,
 )
 
 _LOGGER = logging.getLogger(__name__)
 
 
 class HotSpringCoordinator(DataUpdateCoordinator[dict]):
-    """Keeps a live MQTT connection and republishes state to entities.
-
-    Data flow is push-based: telemetry arrives on paho's thread and is bridged
-    onto the event loop via ``async_set_updated_data``. There is no polling
-    ``_async_update_data`` (updates are event-driven), but the coordinator still
-    provides ``data`` and listener plumbing for entities.
-    """
-
     def __init__(self, hass: HomeAssistant, entry: ConfigEntry):
         super().__init__(hass, _LOGGER, name=DOMAIN)
         self.entry = entry
         self.cloud: HotSpringCloud | None = None
         self.spa: HotSpringSpa | None = None
         self.spa_info: Spa | None = None
+        self._local_url: str | None = entry.data.get(CONF_LOCAL_STATUS_URL) or None
+        self._unsub_poll = None
 
     def _cert_paths(self) -> tuple[str, str, str]:
         d = self.entry.data.get(CONF_CERT_DIR, DEFAULT_CERT_DIR)
@@ -50,15 +55,11 @@ class HotSpringCoordinator(DataUpdateCoordinator[dict]):
         )
 
     async def async_setup(self) -> None:
-        """Authenticate, resolve the spa, fetch broker creds, connect MQTT."""
         cert, key, ca = self._cert_paths()
         cloud = HotSpringCloud(
-            self.entry.data[CONF_EMAIL],
-            self.entry.data[CONF_PASSWORD],
-            cert,
-            key,
-            ca,
+            self.entry.data[CONF_EMAIL], self.entry.data[CONF_PASSWORD], cert, key, ca
         )
+        local = self._local_url
 
         def _blocking_connect() -> HotSpringSpa:
             cloud.login()
@@ -67,34 +68,65 @@ class HotSpringCoordinator(DataUpdateCoordinator[dict]):
                 raise RuntimeError("account has no spas")
             self.spa_info = spas[0]
             creds = cloud.fetch_mqtt_credentials()
-            spa = HotSpringSpa(
-                self.spa_info.root_topic, creds, on_status=self._on_status
-            )
-            spa.connect()
+            spa = HotSpringSpa(self.spa_info.root_topic, creds, on_status=self._on_status)
+            # Local read source -> connect for control only (no MQTT subscribe).
+            spa.connect(subscribe=not local)
+            if local:
+                spa.ingest_status(fetch_local_status(local))
+            else:
                 spa.wait_for_state()
             return spa
 
         self.cloud = cloud
         self.spa = await self.hass.async_add_executor_job(_blocking_connect)
-        # Seed data so entities have an initial value.
+        self.async_set_updated_data(self.spa.merged)
+
+        if local:
+            self._unsub_poll = async_track_time_interval(
+                self.hass, self._async_poll_local, timedelta(seconds=LOCAL_POLL_INTERVAL)
+            )
+
+    async def _async_poll_local(self, _now) -> None:
+        if self.spa is None or not self._local_url:
+            return
+        try:
+            status = await self.hass.async_add_executor_job(
+                fetch_local_status, self._local_url
+            )
+        except HotSpringApiError as err:
+            _LOGGER.debug("local /status poll failed: %s", err)
+            return
+        self.spa.ingest_status(status)
         self.async_set_updated_data(self.spa.merged)
 
     @callback
     def _on_status(self, suffix: str, payload: dict) -> None:
-        """Runs on paho's thread; hop to the event loop to notify listeners."""
+        """Runs on paho's thread (MQTT) or the executor (local); hop to the loop."""
         if self.spa is None:
             return
-        merged = self.spa.merged
-        self.hass.loop.call_soon_threadsafe(self.async_set_updated_data, merged)
+        self.hass.loop.call_soon_threadsafe(self.async_set_updated_data, self.spa.merged)
 
-    async def async_publish_control(self, subsystem: str, control: dict) -> None:
+    async def _run(self, method_name: str, *args) -> None:
         if self.spa is None:
             raise RuntimeError("spa not connected")
-        await self.hass.async_add_executor_job(
-            self.spa.publish_control, subsystem, control
-        )
+        await self.hass.async_add_executor_job(getattr(self.spa, method_name), *args)
+
+    async def async_set_temperature(self, value: int) -> None:
+        await self._run("set_temperature", value)
+
+    async def async_set_salt_level(self, value: int) -> None:
+        await self._run("set_water_care_level", value)
+
+    async def async_set_lights(self, on: bool) -> None:
+        await self._run("set_lights", on)
+
+    async def async_set_jets(self, on: bool) -> None:
+        await self._run("set_jets", on)
 
     async def async_shutdown(self) -> None:
+        if self._unsub_poll is not None:
+            self._unsub_poll()
+            self._unsub_poll = None
         if self.spa is not None:
             await self.hass.async_add_executor_job(self.spa.disconnect)
         await super().async_shutdown()

custom_components/hotspring/number.py

@@ -0,0 +1,53 @@
+"""Number entity: FreshWater salt system output level (0-10, settable)."""
+
+from __future__ import annotations
+
+from homeassistant.components.number import NumberEntity, NumberMode
+from homeassistant.core import HomeAssistant, callback
+from homeassistant.helpers.device_registry import DeviceInfo
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from . import HotSpringConfigEntry
+from .constants import DOMAIN, MANUFACTURER, SALT_LEVEL_MAX, SALT_LEVEL_MIN
+from .coordinator import HotSpringCoordinator
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: HotSpringConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    async_add_entities([HotSpringSaltLevel(entry.runtime_data)])
+
+
+class HotSpringSaltLevel(CoordinatorEntity[HotSpringCoordinator], NumberEntity):
+    _attr_has_entity_name = True
+    _attr_translation_key = "salt_output_level"
+    _attr_native_min_value = SALT_LEVEL_MIN
+    _attr_native_max_value = SALT_LEVEL_MAX
+    _attr_native_step = 1
+    _attr_mode = NumberMode.SLIDER
+    _attr_icon = "mdi:shaker-outline"
+
+    def __init__(self, coordinator: HotSpringCoordinator) -> None:
+        super().__init__(coordinator)
+        root = coordinator.spa_info.root_topic if coordinator.spa_info else "spa"
+        self._attr_unique_id = f"{root}_salt_output_level"
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, root)},
+            manufacturer=MANUFACTURER,
+            name=coordinator.spa_info.name if coordinator.spa_info else "Hot Spring Spa",
+            model="Connected Spa",
+        )
+
+    @property
+    def native_value(self) -> float | None:
+        return self.coordinator.spa.salt_output_level() if self.coordinator.spa else None
+
+    async def async_set_native_value(self, value: float) -> None:
+        await self.coordinator.async_set_salt_level(int(value))
+
+    @callback
+    def _handle_coordinator_update(self) -> None:
+        self.async_write_ha_state()

custom_components/hotspring/sensor.py

@@ -18,7 +18,7 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
 
 from . import HotSpringConfigEntry
-from .const import DOMAIN, MANUFACTURER
+from .constants import DOMAIN, MANUFACTURER
 from .coordinator import HotSpringCoordinator
 
 
@@ -36,13 +36,6 @@ SENSORS: tuple[HotSpringSensorDescription, ...] = (
         state_class=SensorStateClass.MEASUREMENT,
         value_fn=lambda c: c.spa.current_temperature() if c.spa else None,
     ),
-    HotSpringSensorDescription(
-        key="salt_output_level",
-        translation_key="salt_output_level",
-        state_class=SensorStateClass.MEASUREMENT,
-        icon="mdi:shaker-outline",
-        value_fn=lambda c: c.spa.salt_output_level() if c.spa else None,
-    ),
     HotSpringSensorDescription(
         key="cartridge",
         translation_key="cartridge",

custom_components/hotspring/strings.json

@@ -7,7 +7,11 @@
         "data": {
           "email": "E-mail",
           "password": "Password",
-          "cert_dir": "Certificate directory"
+          "cert_dir": "Certificate directory",
+          "local_status_url": "Local /status URL (optional)"
+        },
+        "data_description": {
+          "local_status_url": "If Home Assistant is on the spa's LAN, e.g. http://<spa-ip>/status, monitoring is polled locally instead of over the cloud; control still uses the cloud."
         }
       }
     },
@@ -24,8 +28,14 @@
   "entity": {
     "sensor": {
       "water_temperature": { "name": "Water temperature" },
-      "salt_output_level": { "name": "Salt output level" },
       "cartridge": { "name": "Salt cartridge" }
+    },
+    "number": {
+      "salt_output_level": { "name": "Salt output level" }
+    },
+    "switch": {
+      "lights": { "name": "Lights" },
+      "jets": { "name": "Jets" }
     }
   }
 }

custom_components/hotspring/switch.py

@@ -0,0 +1,84 @@
+"""Switch entities: spa lights (all zones) and jets (all)."""
+
+from __future__ import annotations
+
+from collections.abc import Awaitable, Callable
+from dataclasses import dataclass
+
+from homeassistant.components.switch import SwitchEntity, SwitchEntityDescription
+from homeassistant.core import HomeAssistant, callback
+from homeassistant.helpers.device_registry import DeviceInfo
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from . import HotSpringConfigEntry
+from .constants import DOMAIN, MANUFACTURER
+from .coordinator import HotSpringCoordinator
+
+
+@dataclass(frozen=True, kw_only=True)
+class HotSpringSwitchDescription(SwitchEntityDescription):
+    is_on_fn: Callable[[HotSpringCoordinator], bool | None]
+    set_fn: Callable[[HotSpringCoordinator, bool], Awaitable[None]]
+
+
+SWITCHES: tuple[HotSpringSwitchDescription, ...] = (
+    HotSpringSwitchDescription(
+        key="lights",
+        translation_key="lights",
+        icon="mdi:lightbulb",
+        is_on_fn=lambda c: c.spa.lights_on() if c.spa else None,
+        set_fn=lambda c, on: c.async_set_lights(on),
+    ),
+    HotSpringSwitchDescription(
+        key="jets",
+        translation_key="jets",
+        icon="mdi:chart-bubble",
+        is_on_fn=lambda c: c.spa.jets_on() if c.spa else None,
+        set_fn=lambda c, on: c.async_set_jets(on),
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: HotSpringConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    coordinator = entry.runtime_data
+    async_add_entities(HotSpringSwitch(coordinator, d) for d in SWITCHES)
+
+
+class HotSpringSwitch(CoordinatorEntity[HotSpringCoordinator], SwitchEntity):
+    _attr_has_entity_name = True
+    entity_description: HotSpringSwitchDescription
+
+    def __init__(
+        self,
+        coordinator: HotSpringCoordinator,
+        description: HotSpringSwitchDescription,
+    ) -> None:
+        super().__init__(coordinator)
+        self.entity_description = description
+        root = coordinator.spa_info.root_topic if coordinator.spa_info else "spa"
+        self._attr_unique_id = f"{root}_{description.key}"
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, root)},
+            manufacturer=MANUFACTURER,
+            name=coordinator.spa_info.name if coordinator.spa_info else "Hot Spring Spa",
+            model="Connected Spa",
+        )
+
+    @property
+    def is_on(self) -> bool | None:
+        return self.entity_description.is_on_fn(self.coordinator)
+
+    async def async_turn_on(self, **kwargs) -> None:
+        await self.entity_description.set_fn(self.coordinator, True)
+
+    async def async_turn_off(self, **kwargs) -> None:
+        await self.entity_description.set_fn(self.coordinator, False)
+
+    @callback
+    def _handle_coordinator_update(self) -> None:
+        self.async_write_ha_state()

custom_components/hotspring/translations/en.json

@@ -7,7 +7,11 @@
         "data": {
           "email": "E-mail",
           "password": "Password",
-          "cert_dir": "Certificate directory"
+          "cert_dir": "Certificate directory",
+          "local_status_url": "Local /status URL (optional)"
+        },
+        "data_description": {
+          "local_status_url": "If Home Assistant is on the spa's LAN, e.g. http://<spa-ip>/status, monitoring is polled locally instead of over the cloud; control still uses the cloud."
         }
       }
     },
@@ -24,8 +28,14 @@
   "entity": {
     "sensor": {
       "water_temperature": { "name": "Water temperature" },
-      "salt_output_level": { "name": "Salt output level" },
       "cartridge": { "name": "Salt cartridge" }
+    },
+    "number": {
+      "salt_output_level": { "name": "Salt output level" }
+    },
+    "switch": {
+      "lights": { "name": "Lights" },
+      "jets": { "name": "Jets" }
     }
   }
 }