DeviceTool.getHardwareId

Gets the hardware ID of this tool, or 0 if it's not known. When non-zero, the identificator is unique for the given tool model, meaning that two identical tools will share the same hardware_id, but will have different serial numbers (see [gdk.device_tool.DeviceTool.getSerial]).

This is a more concrete (and device specific) method to identify a #GdkDeviceTool than [gdk.device_tool.DeviceTool.getToolType], as a tablet may support multiple devices with the same #GdkDeviceToolType, but having different hardware identificators.