pattern_matching.exs

  # When pin is 10-99 and value is 0-9
  def parse_code(<<"R21 P", param :: size(16)," V", value :: size(8), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # When param is 10-99 and up and value is 10-99
  def parse_code(<<"R21 P", param :: size(16)," V", value :: size(16), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # When param is 10-99 and up and value is 100-999
  def parse_code(<<"R21 P", param :: size(16)," V", value :: size(24), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # When param is 10-99 and up and value is 1000-9999
  def parse_code(<<"R21 P", param :: size(16)," V", value :: size(32), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # When param is 10-99 and up and value is 10000-99999
  def parse_code(<<"R21 P", param :: size(16)," V", value :: size(40), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end

  # When pin is 100-999 and value is 0-9
  def parse_code(<<"R21 P", param :: size(24)," V", value :: size(8), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # When param is 100-999 and up and value is 10-99
  def parse_code(<<"R21 P", param :: size(24)," V", value :: size(16), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # When param is 100-999 and up and value is 100-999
  def parse_code(<<"R21 P", param :: size(24)," V", value :: size(24), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # When param is 100-999 and up and value is 1000-9999
  def parse_code(<<"R21 P", param :: size(24)," V", value :: size(32), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # When param is 100-999 and up and value is 10000-99999
  def parse_code(<<"R21 P", param :: size(24)," V", value :: size(40), " Q", tag :: binary>>)
    do { :report_parameter_value, param, value, tag } end
  # Fallback
  def parse_code(<<"R21", params :: binary>>) do { :report_parameter_value, params } end