Requiem.QUIC.NIF.connection_on_packet

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

connection_on_packet(pid, conn, packet)

Specs

connection_on_packet(pid(), integer(), binary()) ::
  {:ok, non_neg_integer()} | {:error, :system_error | :already_closed}