first commit

simulators/bots/env_sensor.py

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+import math
+import random
+from datetime import datetime, timezone
+from bots.base import BaseBot
+
+
+class EnvSensorBot(BaseBot):
+    """Temperature + humidity sensor for a single rack."""
+
+    interval = 30
+
+    def __init__(self, site_id: str, room_id: str, rack_id: str) -> None:
+        super().__init__()
+        self.site_id = site_id
+        self.room_id = room_id
+        self.rack_id = rack_id
+        # Racks at the far end of a row run slightly warmer
+        rack_num = int(rack_id[-2:]) if rack_id[-2:].isdigit() else 1
+        self._base_temp = 21.5 + (rack_num * 0.15)
+        self._base_humidity = 44.0 + random.uniform(-2, 2)
+
+    def get_topic(self) -> str:
+        return f"bms/{self.site_id}/{self.room_id}/{self.rack_id}/env"
+
+    def get_payload(self) -> dict:
+        hour = datetime.now(timezone.utc).hour
+        # Natural day/night cycle — slightly warmer during working hours
+        day_factor = 1.0 + 0.04 * math.sin(math.pi * (hour - 6) / 12)
+
+        temp = (
+            self._base_temp * day_factor
+            + math.sin(self._scenario_step * 0.3) * 0.2
+            + random.gauss(0, 0.15)
+        )
+        humidity = self._base_humidity + math.sin(self._scenario_step * 0.2) * 1.5 + random.gauss(0, 0.3)
+
+        # Scenarios
+        if self._scenario == "COOLING_FAILURE":
+            # CRAC offline — racks heat up rapidly
+            temp += min(self._scenario_step * 0.4, 12.0)
+        elif self._scenario == "HIGH_TEMPERATURE":
+            # Gradual ambient rise (e.g. summer overload) — slower, caps lower
+            temp += min(self._scenario_step * 0.2, 6.0)
+        elif self._scenario == "HUMIDITY_SPIKE":
+            # Condensation / humidifier fault
+            humidity += min(self._scenario_step * 1.5, 28.0)
+        elif self._scenario == "SLOW_BURN":
+            # Dirty filter starving airflow — temp and humidity both climb together
+            temp     += min(self._scenario_step * 0.15, 7.0)
+            humidity += min(self._scenario_step * 0.8,  22.0)
+
+        return {
+            "temperature": round(max(18.0, temp), 2),
+            "humidity":    round(max(30.0, min(80.0, humidity)), 1),
+        }