Astarte.DataAccess.Device.interface_version

You're seeing just the function interface_version, go back to Astarte.DataAccess.Device module for more information.
Link to this function

interface_version(realm, device_id, interface_name)

View Source

Specs

interface_version(String.t(), Astarte.Core.Device.device_id(), String.t()) ::
  {:ok, integer()} | {:error, atom()}