Requiem.QUIC.NIF.connection_stream_send

You're seeing just the function connection_stream_send, go back to Requiem.QUIC.NIF module for more information.
Link to this function

connection_stream_send(conn, stream_id, data, fin)

Specs

connection_stream_send(integer(), non_neg_integer(), binary(), boolean()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}