"Initial" working version, after cleanup.

s_climate_sensors.go

@@ -0,0 +1,53 @@
+package hapz2m
+
+import (
+	"github.com/brutella/hap/accessory"
+	"github.com/brutella/hap/service"
+)
+
+func createClimateServices(dev *Device) (byte, []*service.S, []*ExposeMapping, error) {
+	var svcs []*service.S
+	var exposes []*ExposeMapping
+
+	for _, exp := range dev.Definition.Exposes {
+		if exp.Ignored() {
+			continue
+		}
+
+		// climate sensors are numeric only
+		if exp.Type != "numeric" {
+			continue
+		}
+
+		exp := exp // create a copy
+
+		switch {
+		case exp.Name == "temperature":
+			s := service.NewTemperatureSensor()
+
+			// doesn't do anything, since the Home app seem to round values to 0.25 increments regardless
+			// https://developer.apple.com/forums/thread/674461
+			// https://github.com/home-assistant/core/issues/45332
+			s.CurrentTemperature.SetStepValue(0.01)
+
+			svcs = append(svcs, s.S)
+			exposes = append(exposes, &ExposeMapping{&exp, s.CurrentTemperature.C, nil})
+
+		case exp.Name == "humidity":
+			s := service.NewHumiditySensor()
+			s.CurrentRelativeHumidity.SetStepValue(0.01) // ditto, but 1% increments
+			svcs = append(svcs, s.S)
+			exposes = append(exposes, &ExposeMapping{&exp, s.CurrentRelativeHumidity.C, nil})
+
+		case exp.Name == "pressure":
+			// TODO looks like pressure is not standard in HomeKit
+			// Eve has custom UUIDs: https://gist.github.com/simont77/3f4d4330fa55b83f8ca96388d9004e7d
+		}
+	}
+
+	return accessory.TypeSensor, svcs, exposes, nil
+}
+
+func init() {
+	RegisterCreateServiceHandler(createClimateServices)
+}