QMI.Control.release_client_id

You're seeing just the function release_client_id, go back to QMI.Control module for more information.
Link to this function

release_client_id(qmi, service_id, client_id)

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Specs

release_client_id(QMI.name(), non_neg_integer(), non_neg_integer()) ::
  :ok | {:error, atom()}

Release a client id for a service