diff --git a/api/types.go b/api/types.go
new file mode 100644
index 0000000..7f01e92
--- /dev/null
+++ b/api/types.go
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+package api
+
+type DeviceCategory uint
+
+const (
+	// Grid Connection Point Hub (GCPH) (e.g. a control unit from the public grid operator)
+	DeviceCategoryGridConnectionHub DeviceCategory = 1
+	// Energy Management System (EMS) (device managing the electrical energy consumption/production of connected devices in the building)
+	DeviceCategoryEnergyManagementSystem DeviceCategory = 2
+	// E-mobility related device (e.g., charging station)
+	DeviceCategoryEMobility DeviceCategory = 3
+	// HVAC related device/system (e.g., heat pump)
+	DeviceCategoryHVAC DeviceCategory = 4
+	// Inverter (PV/battery/hybrid inverter)
+	DeviceCategoryInverter DeviceCategory = 5
+	// Domestic appliance (e.g., washing machine, dryer, fridge, etc.)
+	DeviceCategoryDomesticAppliance DeviceCategory = 6
+	// Metering device (e.g., smart meter or sub-meter with its own communications technology)
+	DeviceCategoryMetering DeviceCategory = 7
+)