Add HTTPS/SSL support and enhance connection handling

- Implemented HTTPS/SSL support for OpenClaw gateways in `lan_https` mode.
- Added configuration options for SSL certificate verification.
- Improved auto-discovery for `lan_https` access mode.
- Updated documentation in README and changelog for new features and fixes.
- Fixed connection errors related to SSL certificate verification.

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 All notable changes to the OpenClaw Home Assistant Integration will be documented in this file.
 
+## [0.1.52] - 2026-02-23
+
+### Added
+- Added HTTPS / SSL support for connecting to OpenClaw gateways running in `lan_https` mode or behind TLS reverse proxies.
+- Auto-discovery now detects `access_mode: lan_https` and connects to the internal gateway port automatically (no certificate setup needed for local addons).
+- Added `Verify SSL certificate` option in manual config for self-signed certificate environments.
+- Added `ssl_error` config flow error with actionable guidance.
+- Added comprehensive remote connection documentation to README with setup table for all access modes.
+
+### Fixed
+- Fixed "400 Bad Request — plain HTTP request was sent to HTTPS port" when the addon uses `lan_https` access mode.
+
 ## [0.1.51] - 2026-02-23
 
 ### Fixed

README.md

@@ -38,10 +38,68 @@ OpenClaw is a Home Assistant custom integration that connects your HA instance t
 ## Requirements
 
 - Home Assistant Core `2025.1.0+` (declared minimum)
-- Supervisor is optional (used for auto-discovery)
+- An **OpenClaw gateway** with `enable_openai_api` enabled — either:
-- OpenClaw Assistant addon installed and running
+  - The [OpenClaw Assistant addon](https://github.com/techartdev/OpenClawHomeAssistant) running on the same HA instance (auto-discovery supported), **or**
+  - Any standalone [OpenClaw](https://github.com/openclaw/openclaw) installation reachable over the network (manual config)
+- Supervisor is optional (used only for addon auto-discovery)
 
-The integration can auto-detect the addon when Supervisor is available. You can always configure host/port/token manually.
+> **No addon required.** If you have OpenClaw running anywhere — on a separate server, a VPS, a Docker container, or even another machine on your LAN — this integration can connect to it via the manual configuration flow.
+
+---
+
+## Connection modes
+
+The integration supports connecting to OpenClaw in several ways:
+
+### Local addon (auto-discovery)
+
+If the OpenClaw Assistant addon is installed on the **same** Home Assistant instance, the integration auto-discovers it:
+- Reads token from the shared filesystem
+- Detects `access_mode` and chooses the correct port automatically
+- No manual config needed — just click **Submit** on the confirm step
+
+> **`lan_https` mode**: The integration automatically connects to the internal gateway port (plain HTTP on loopback), bypassing the HTTPS proxy entirely. No certificate setup required.
+
+### Remote or standalone OpenClaw instance (manual config)
+
+You can connect to **any reachable OpenClaw gateway** — whether it's the HA addon on another machine, a standalone `openclaw` install on a VPS, or a Docker container on your LAN. The integration doesn't care how OpenClaw is installed; it only needs the `/v1/chat/completions` endpoint.
+
+**Prerequisites on the OpenClaw instance:**
+
+1. The OpenAI-compatible API must be **enabled**:
+   - **Addon users**: Set `enable_openai_api: true` in addon settings
+   - **Standalone users**: Set `gateway.http.endpoints.chatCompletions.enabled: true` in `openclaw.json`, or run:
+     ```sh
+     openclaw config set gateway.http.endpoints.chatCompletions.enabled true
+     ```
+2. The gateway must be **network-reachable** from your HA instance (not bound to loopback only)
+3. You need the **gateway auth token**:
+   ```sh
+   openclaw config get gateway.auth.token
+   ```
+
+**Setup steps:**
+
+1. Go to **Settings → Devices & Services → Add Integration → OpenClaw**
+2. Auto-discovery will fail (no local addon) — you'll see the **Manual Configuration** form
+3. Fill in:
+   - **Gateway Host**: IP or hostname of the remote machine (e.g. `192.168.1.50`)
+   - **Gateway Port**: The gateway port (default `18789`)
+   - **Gateway Token**: Auth token from the remote `openclaw.json`
+   - **Use SSL (HTTPS)**: Check if connecting to an HTTPS endpoint
+   - **Verify SSL certificate**: Uncheck for self-signed certificates (e.g. `lan_https` mode)
+
+### Common remote scenarios
+
+| Remote access mode | Host | Port | Use SSL | Verify SSL | Notes |
+|---|---|---|---|---|---|
+| Standalone OpenClaw (plain HTTP on LAN) | Remote IP | 18789 | ❌ | — | Default `openclaw gateway run` config |
+| `lan_https` (addon built-in HTTPS proxy) | Remote IP | 18789 | ✅ | ❌ | Self-signed cert; disable verification |
+| Behind reverse proxy (NPM/Caddy with Let's Encrypt) | Domain or IP | 443 | ✅ | ✅ | Trusted cert from a real CA |
+| Plain HTTP addon on LAN | Remote IP | 18789 | ❌ | — | Addon `bind_mode` must be `lan` |
+| Tailscale | Tailscale IP | 18789 | ❌ | — | Encrypted tunnel; plain HTTP is fine |
+
+> **Security note**: Avoid exposing plain HTTP gateways to the public internet. Use `lan_https`, a reverse proxy with TLS, or Tailscale for remote access.
 
 ---
 
@@ -307,6 +365,12 @@ action:
 - Verify `openclaw_message_received` is being fired in Developer Tools → Events
 - Confirm session IDs match between card and service calls
 
+### "400 Bad Request — plain HTTP request was sent to HTTPS port"
+
+- The gateway is running in `lan_https` mode (built-in HTTPS proxy)
+- **Local addon**: Remove and re-add the integration — auto-discovery now detects `lan_https` and uses the correct internal port automatically
+- **Remote connection**: Enable **Use SSL (HTTPS)** and disable **Verify SSL certificate** in the manual config
+
 ---
 
 ## Development notes

custom_components/openclaw/__init__.py

@@ -51,6 +51,7 @@ from .const import (
     CONF_GATEWAY_PORT,
     CONF_GATEWAY_TOKEN,
     CONF_USE_SSL,
+    CONF_VERIFY_SSL,
     CONF_CONTEXT_MAX_CHARS,
     CONF_CONTEXT_STRATEGY,
     CONF_ENABLE_TOOL_CALLS,
@@ -92,7 +93,7 @@ _CARD_PATH = Path(__file__).parent / "www" / _CARD_FILENAME
 # URL at which the card JS is served (registered via register_static_path)
 _CARD_STATIC_URL = f"/openclaw/{_CARD_FILENAME}"
 # Versioned URL used for Lovelace resource registration to avoid stale browser cache
-_CARD_URL = f"{_CARD_STATIC_URL}?v=0.1.51"
+_CARD_URL = f"{_CARD_STATIC_URL}?v=0.1.52"
 
 OpenClawConfigEntry = ConfigEntry
 
@@ -130,13 +131,16 @@ async def async_setup_entry(hass: HomeAssistant, entry: OpenClawConfigEntry) ->
 
     Creates the API client, coordinator, and forwards setup to platforms.
     """
-    session = async_get_clientsession(hass)
+    use_ssl = entry.data.get(CONF_USE_SSL, False)
+    verify_ssl = entry.data.get(CONF_VERIFY_SSL, True)
+    session = async_get_clientsession(hass, verify_ssl=verify_ssl)
 
     client = OpenClawApiClient(
         host=entry.data[CONF_GATEWAY_HOST],
         port=entry.data[CONF_GATEWAY_PORT],
         token=entry.data[CONF_GATEWAY_TOKEN],
-        use_ssl=entry.data.get(CONF_USE_SSL, False),
+        use_ssl=use_ssl,
+        verify_ssl=verify_ssl,
         session=session,
     )
 

custom_components/openclaw/api.py

@@ -49,6 +49,7 @@ class OpenClawApiClient:
         port: int,
         token: str,
         use_ssl: bool = False,
+        verify_ssl: bool = True,
         session: aiohttp.ClientSession | None = None,
     ) -> None:
         """Initialize the API client.
@@ -58,14 +59,19 @@ class OpenClawApiClient:
             port: Gateway port number.
             token: Authentication token from openclaw.json.
             use_ssl: Use HTTPS instead of HTTP.
+            verify_ssl: Verify SSL certificates (set False for self-signed certs).
             session: Optional aiohttp session (reused from HA).
         """
         self._host = host
         self._port = port
         self._token = token
         self._use_ssl = use_ssl
+        self._verify_ssl = verify_ssl
         self._session = session
         self._base_url = f"{'https' if use_ssl else 'http'}://{host}:{port}"
+        # ssl=False disables cert verification for self-signed certs;
+        # ssl=None uses default verification.
+        self._ssl_param: bool | None = False if (use_ssl and not verify_ssl) else None
 
     @property
     def base_url(self) -> str:
@@ -121,6 +127,7 @@ class OpenClawApiClient:
                 url,
                 headers=self._headers(),
                 timeout=timeout,
+                ssl=self._ssl_param,
                 **kwargs,
             ) as resp:
                 if resp.status == 401:
@@ -146,6 +153,13 @@ class OpenClawApiClient:
                     )
                 return await resp.json()
 
+        except aiohttp.ClientConnectorCertificateError as err:
+            raise OpenClawConnectionError(
+                f"SSL certificate verification failed for {url}. "
+                f"If using self-signed certificates (e.g. lan_https mode), "
+                f"disable 'Verify SSL certificate' in the integration config. "
+                f"Error: {err}"
+            ) from err
         except (aiohttp.ClientConnectorError, aiohttp.ClientOSError, asyncio.TimeoutError) as err:
             raise OpenClawConnectionError(
                 f"Cannot connect to OpenClaw gateway at {url}: {err}"
@@ -213,6 +227,7 @@ class OpenClawApiClient:
                 headers=headers,
                 json=payload,
                 timeout=STREAM_TIMEOUT,
+                ssl=self._ssl_param,
             ) as resp:
                 if resp.status == 401:
                     raise OpenClawAuthError("Authentication failed")
@@ -274,6 +289,7 @@ class OpenClawApiClient:
                 headers=headers,
                 json=payload,
                 timeout=STREAM_TIMEOUT,
+                ssl=self._ssl_param,
             ) as resp:
                 if resp.status == 401:
                     raise OpenClawAuthError("Authentication failed")
@@ -338,6 +354,7 @@ class OpenClawApiClient:
                 headers=self._headers(),
                 json={"messages": [], "stream": False},
                 timeout=API_TIMEOUT,
+                ssl=self._ssl_param,
             ) as resp:
                 if resp.status in (401, 403):
                     raise OpenClawAuthError(
@@ -381,6 +398,7 @@ class OpenClawApiClient:
             async with session.get(
                 self._base_url,
                 timeout=API_TIMEOUT,
+                ssl=self._ssl_param,
             ) as resp:
                 return resp.status < 500
         except (aiohttp.ClientConnectorError, aiohttp.ClientOSError, asyncio.TimeoutError) as err:
@@ -424,6 +442,7 @@ class OpenClawApiClient:
                 headers=headers,
                 json=payload,
                 timeout=STREAM_TIMEOUT,
+                ssl=self._ssl_param,
             ) as resp:
                 if resp.status == 401:
                     raise OpenClawAuthError("Authentication failed")

custom_components/openclaw/config_flow.py

@@ -38,6 +38,7 @@ from .const import (
     CONF_GATEWAY_PORT,
     CONF_GATEWAY_TOKEN,
     CONF_USE_SSL,
+    CONF_VERIFY_SSL,
     CONF_CONTEXT_MAX_CHARS,
     CONF_CONTEXT_STRATEGY,
     CONF_ENABLE_TOOL_CALLS,
@@ -233,11 +234,30 @@ async def _async_try_discover_addon(hass: HomeAssistant) -> dict[str, Any] | Non
     if port is None:
         port = DEFAULT_GATEWAY_PORT
 
+    # Detect access mode — lan_https uses a built-in HTTPS reverse proxy.
+    # In that mode nginx terminates TLS on the external (user-facing) port
+    # and the gateway itself listens on port+1 on loopback (plain HTTP).
+    # Since HA and the addon share host_network, we connect to the internal
+    # port via loopback to avoid self-signed certificate issues entirely.
+    access_mode = addon_options.get("access_mode", "custom")
+    use_ssl = False
+    verify_ssl = True
+
+    if access_mode == "lan_https":
+        _LOGGER.info(
+            "Detected access_mode=lan_https — using internal gateway port %d "
+            "(external HTTPS proxy is on port %d)",
+            port + 1,
+            port,
+        )
+        port = port + 1
+
     return {
         CONF_GATEWAY_HOST: DEFAULT_GATEWAY_HOST,
         CONF_GATEWAY_PORT: port,
         CONF_GATEWAY_TOKEN: token,
-        CONF_USE_SSL: False,
+        CONF_USE_SSL: use_ssl,
+        CONF_VERIFY_SSL: verify_ssl,
         CONF_ADDON_CONFIG_PATH: str(config_dir),
     }
 
@@ -248,14 +268,16 @@ async def _async_validate_connection(
     port: int,
     token: str,
     use_ssl: bool = False,
+    verify_ssl: bool = True,
 ) -> bool:
     """Validate that we can connect and authenticate to the gateway."""
-    session = async_get_clientsession(hass)
+    session = async_get_clientsession(hass, verify_ssl=verify_ssl)
     client = OpenClawApiClient(
         host=host,
         port=port,
         token=token,
         use_ssl=use_ssl,
+        verify_ssl=verify_ssl,
         session=session,
     )
     return await client.async_check_connection()
@@ -312,6 +334,7 @@ class OpenClawConfigFlow(ConfigFlow, domain=DOMAIN):
                     self._discovered[CONF_GATEWAY_PORT],
                     self._discovered[CONF_GATEWAY_TOKEN],
                     self._discovered.get(CONF_USE_SSL, False),
+                    self._discovered.get(CONF_VERIFY_SSL, True),
                 )
             except OpenClawAuthError:
                 connected = False
@@ -355,17 +378,23 @@ class OpenClawConfigFlow(ConfigFlow, domain=DOMAIN):
             port = user_input[CONF_GATEWAY_PORT]
             token = user_input[CONF_GATEWAY_TOKEN]
             use_ssl = user_input.get(CONF_USE_SSL, False)
+            verify_ssl = user_input.get(CONF_VERIFY_SSL, True)
 
             try:
                 connected = await _async_validate_connection(
-                    self.hass, host, port, token, use_ssl
+                    self.hass, host, port, token, use_ssl, verify_ssl
                 )
             except OpenClawAuthError:
                 errors["base"] = "invalid_auth"
                 connected = False
-            except OpenClawConnectionError:
+            except OpenClawConnectionError as err:
-                errors["base"] = "cannot_connect"
+                err_msg = str(err).lower()
+                if "ssl" in err_msg or "certificate" in err_msg:
+                    errors["base"] = "ssl_error"
+                else:
+                    errors["base"] = "cannot_connect"
                 connected = False
+                _LOGGER.warning("Connection error during config check: %s", err)
             except OpenClawApiError as err:
                 errors["base"] = "openai_api_disabled"
                 connected = False
@@ -379,6 +408,7 @@ class OpenClawConfigFlow(ConfigFlow, domain=DOMAIN):
                         CONF_GATEWAY_PORT: port,
                         CONF_GATEWAY_TOKEN: token,
                         CONF_USE_SSL: use_ssl,
+                        CONF_VERIFY_SSL: verify_ssl,
                     },
                 )
             if "base" not in errors:
@@ -396,6 +426,7 @@ class OpenClawConfigFlow(ConfigFlow, domain=DOMAIN):
                     ): vol.All(int, vol.Range(min=1, max=65535)),
                     vol.Required(CONF_GATEWAY_TOKEN): str,
                     vol.Optional(CONF_USE_SSL, default=False): bool,
+                    vol.Optional(CONF_VERIFY_SSL, default=True): bool,
                 }
             ),
             errors=errors,

custom_components/openclaw/const.py

@@ -21,6 +21,7 @@ CONF_GATEWAY_HOST = "gateway_host"
 CONF_GATEWAY_PORT = "gateway_port"
 CONF_GATEWAY_TOKEN = "gateway_token"
 CONF_USE_SSL = "use_ssl"
+CONF_VERIFY_SSL = "verify_ssl"
 CONF_ADDON_CONFIG_PATH = "addon_config_path"
 
 # Options

custom_components/openclaw/manifest.json

@@ -8,7 +8,7 @@
   "iot_class": "local_polling",
   "issue_tracker": "https://github.com/techartdev/OpenClawHomeAssistant/issues",
   "requirements": [],
-  "version": "0.1.51",
+  "version": "0.1.52",
   "dependencies": ["conversation"],
   "after_dependencies": ["hassio", "lovelace"]
 }

custom_components/openclaw/strings.json

@@ -17,14 +17,14 @@
           "gateway_host": "Gateway Host",
           "gateway_port": "Gateway Port",
           "gateway_token": "Gateway Token",
-          "use_ssl": "Use SSL (HTTPS)"
+          "use_ssl": "Use SSL (HTTPS)",
+          "verify_ssl": "Verify SSL certificate"
         }
       }
     },
     "error": {
       "cannot_connect": "Cannot connect to the OpenClaw gateway. Ensure the addon is running.",
-      "invalid_auth": "Invalid gateway token. Check your OpenClaw configuration.",
+      "invalid_auth": "Invalid gateway token. Check your OpenClaw configuration.",      "ssl_error": "SSL certificate verification failed. If using self-signed certificates (e.g. lan_https mode), uncheck 'Verify SSL certificate' or use automatic discovery.",      "openai_api_disabled": "The gateway returned an unexpected response — the OpenAI-compatible API is likely disabled. In the OpenClaw addon settings enable 'enable_openai_api', restart the addon, and try again.",
-      "openai_api_disabled": "The gateway returned an unexpected response — the OpenAI-compatible API is likely disabled. In the OpenClaw addon settings enable 'enable_openai_api', restart the addon, and try again.",
       "unknown": "An unexpected error occurred."
     },
     "abort": {

custom_components/openclaw/translations/en.json

@@ -17,13 +17,15 @@
           "gateway_host": "Gateway Host",
           "gateway_port": "Gateway Port",
           "gateway_token": "Gateway Token",
-          "use_ssl": "Use SSL (HTTPS)"
+          "use_ssl": "Use SSL (HTTPS)",
+          "verify_ssl": "Verify SSL certificate"
         }
       }
     },
     "error": {
       "cannot_connect": "Cannot connect to the OpenClaw gateway. Ensure the addon is running.",
       "invalid_auth": "Invalid gateway token. Check your OpenClaw configuration.",
+      "ssl_error": "SSL certificate verification failed. If using self-signed certificates (e.g. lan_https mode), uncheck 'Verify SSL certificate' or use automatic discovery.",
       "openai_api_disabled": "The gateway returned an unexpected response — the OpenAI-compatible API is likely disabled. In the OpenClaw addon settings enable 'enable_openai_api', restart the addon, and try again.",
       "unknown": "An unexpected error occurred."
     },

www/openclaw-chat-card.js

@@ -1,7 +1,7 @@
 (async () => {
   try {
     if (!customElements.get("openclaw-chat-card")) {
-      const src = "/openclaw/openclaw-chat-card.js?v=0.1.51";
+      const src = "/openclaw/openclaw-chat-card.js?v=0.1.52";
       console.info("OpenClaw loader importing", src);
       await import(src);
     }