example_profile_read.ex

defmodule Parser do
  use Platform.Parsing.Behaviour
  require Logger

  # Example parser for reading values from device profile
  #
  # A profile has a "technical name" and each field has its own "technical name".
  # These are needed here, NOT the display name!
  #
  # Name: Example parser for reading profile values of device
  # Changelog:
  #   2019-09-30 [jb]: Initial implementation

  def preloads do
    [device: [profile_data: [:profile]]]
  end

  def parse(<<value::16>>, %{meta: %{frame_port: 42}} = meta) do
    factor = get(meta, [:device, :fields, :my_profile, :my_field], 1)

    %{
      value: value * factor
    }
  end

  def parse(payload, meta) do
    Logger.warn(
      "Could not parse payload #{inspect(payload)} with frame_port #{
        inspect(get_in(meta, [:meta, :frame_port]))
      }"
    )

    []
  end

  def tests() do
    [
      {
        # No profile given, default factor =1 will be used.
        :parse_hex,
        "1337",
        %{meta: %{frame_port: 42}},
        %{value: 4919}
      },
      {
        # Profile has factor value =2.
        :parse_hex,
        "1337",
        %{meta: %{frame_port: 42}, device: %{fields: %{my_profile: %{my_field: 2}}}},
        %{value: 9838}
      }
    ]
  end
end