Add optional temperature support to SNMP checker

- New temperature_oid config parameter
- Temperature published as integer via MQTT
- Auto-creates Home Assistant temperature sensor via MQTT Discovery

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

checkers/snmp.py

@@ -19,16 +19,22 @@ class SnmpChecker(BaseChecker):
         port = self.config.get("port", 161)
         community = self.config.get("community", "public")
         oid = self.config.get("oid", "1.3.6.1.2.1.1.1.0")  # sysDescr
+        temperature_oid = self.config.get("temperature_oid")
         timeout_val = self.config.get("timeout", 5)
 
         start = time.time()
         try:
             with Slim() as slim:
+                # Build list of OIDs to query
+                oids = [ObjectType(ObjectIdentity(oid))]
+                if temperature_oid:
+                    oids.append(ObjectType(ObjectIdentity(temperature_oid)))
+
                 error_indication, error_status, error_index, var_binds = await slim.get(
                     community,
                     host,
                     port,
-                    ObjectType(ObjectIdentity(oid)),
+                    *oids,
                     timeout=timeout_val,
                     retries=1
                 )
@@ -48,12 +54,23 @@ class SnmpChecker(BaseChecker):
                     response_time=None
                 )
             else:
-                values = {str(oid): str(val) for oid, val in var_binds}
+                details = {str(oid): str(val) for oid, val in var_binds}
+
+                # Extract temperature if configured
+                if temperature_oid:
+                    for oid_key, val in var_binds:
+                        if str(oid_key) == temperature_oid:
+                            try:
+                                details["temperature"] = int(val)
+                            except (ValueError, TypeError):
+                                pass  # Ignore if not a valid integer
+                            break
+
                 return CheckResult(
                     success=True,
                     message="SNMP response OK",
                     response_time=response_time,
-                    details=values
+                    details=details
                 )
         except Exception as e:
             return CheckResult(

config.yaml.example

@@ -49,6 +49,7 @@ checks:
     host: "192.168.1.2"
     community: "public"
     oid: "1.3.6.1.2.1.1.1.0"  # sysDescr
+    temperature_oid: "1.3.6.1.4.1.14988.1.1.3.10.0"  # Optional, OID varies by vendor
     interval: 120
 
   # DNS checks

lan_checker.py

@@ -121,6 +121,29 @@ class LanChecker:
                 retain=True
             )
 
+            # Sensor for temperature (SNMP only, if temperature_oid configured)
+            if check.get("type") == "snmp" and check.get("temperature_oid"):
+                temp_config = {
+                    "name": f"{device_name} Temperature",
+                    "unique_id": f"lan_checker_{device_id}_temperature",
+                    "state_topic": f"lan_checker/{device_id}/state",
+                    "value_template": "{{ value_json.temperature | default('unavailable') }}",
+                    "unit_of_measurement": "°C",
+                    "device_class": "temperature",
+                    "state_class": "measurement",
+                    "device": {
+                        "identifiers": [f"lan_checker_{device_id}"],
+                        "name": device_name,
+                        "manufacturer": "LAN Checker",
+                    },
+                }
+
+                self.mqtt_client.publish(
+                    f"homeassistant/sensor/lan_checker_{device_id}_temperature/config",
+                    json.dumps(temp_config),
+                    retain=True
+                )
+
             logger.info(f"Published discovery for: {device_name}")
 
     def _setup_checks(self):
@@ -155,6 +178,9 @@ class LanChecker:
 
         if result.details:
             payload["details"] = result.details
+            # Extract temperature for SNMP checks
+            if "temperature" in result.details:
+                payload["temperature"] = result.details["temperature"]
 
         topic = f"lan_checker/{check['id']}/state"
         self.mqtt_client.publish(topic, json.dumps(payload), retain=True)