ATECC508A.Transport.request

You're seeing just the callback request, go back to ATECC508A.Transport module for more information.
Link to this callback

request(id, payload, timeout, response_payload_len)

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Specs

request(
  id :: any(),
  payload :: binary(),
  timeout :: non_neg_integer(),
  response_payload_len :: non_neg_integer()
) :: {:ok, binary()} | {:error, atom()}