Astarte.Device.unset_property

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

unset_property(pid, interface_name, path)

Specs

unset_property(pid :: pid(), interface_name :: String.t(), path :: String.t()) ::
  :ok | {:error, reason :: term()}

Unset a property value to Astarte.

This call is blocking and waits for the message to be ACKed at the MQTT level.