feat: Begins more work on async integration

Sources/Models/TemperatureAndHumiditySensor.swift

@@ -0,0 +1,65 @@
+import Psychrometrics
+
+public struct TemperatureAndHumiditySensor: Equatable, Identifiable {
+    /// The identifier of the sensor, same as the location.
+    public var id: Location { location }
+
+    public let altitude: Length
+
+    /// The location identifier of the sensor
+    public let location: Location
+
+    /// The current temperature value of the sensor.
+    @TrackedChanges
+    public var temperature: Temperature?
+
+    /// The current humidity value of the sensor.
+    @TrackedChanges
+    public var humidity: RelativeHumidity?
+
+    /// The psychrometric units of the sensor.
+    public let units: PsychrometricEnvironment.Units
+
+    public init(
+        location: Location,
+        altitude: Length = .feet(800.0),
+        temperature: Temperature? = nil,
+        humidity: RelativeHumidity? = nil,
+        needsProcessed: Bool = false,
+        units: PsychrometricEnvironment.Units = .imperial
+    ) {
+        self.altitude = altitude
+        self.location = location
+        self._temperature = .init(wrappedValue: temperature, needsProcessed: needsProcessed)
+        self._humidity = .init(wrappedValue: humidity, needsProcessed: needsProcessed)
+        self.units = units
+    }
+
+    /// The calculated dew-point temperature of the sensor.
+    public var dewPoint: DewPoint? {
+        guard let temperature = temperature,
+              let humidity = humidity,
+              !temperature.rawValue.isNaN,
+              !humidity.rawValue.isNaN
+        else { return nil }
+        return .init(dryBulb: temperature, humidity: humidity, units: units)
+    }
+
+    /// Check whether any of the sensor values have changed and need processed.
+    public var needsProcessed: Bool {
+        get { $temperature.needsProcessed || $humidity.needsProcessed }
+        set {
+            $temperature.needsProcessed = newValue
+            $humidity.needsProcessed = newValue
+        }
+    }
+
+    /// Represents the different locations of a temperature and humidity sensor, which can
+    /// be used to derive the topic to both listen and publish new values to.
+    public enum Location: String, Equatable, Hashable {
+        case mixedAir = "mixed-air"
+        case postCoil = "post-coil"
+        case `return`
+        case supply
+    }
+}