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(