42 lines
1.4 KiB
Elixir
42 lines
1.4 KiB
Elixir
defmodule Aprsme.DeviceParser do
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@moduledoc """
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Extracts device identifiers from APRS packet data.
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"""
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@doc """
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Extracts a device identifier from packet data.
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Returns the device identifier string or nil if not found.
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"""
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@spec extract_device_identifier(map()) :: String.t() | nil
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def extract_device_identifier(packet_data) do
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extract_from_destination(packet_data) ||
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extract_from_device_identifier(packet_data) ||
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extract_from_data_extended(packet_data)
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end
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defp extract_from_destination(packet_data) do
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get_field_value(packet_data, :destination) || get_field_value(packet_data, "destination")
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end
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defp extract_from_device_identifier(packet_data) do
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get_field_value(packet_data, :device_identifier) || get_field_value(packet_data, "device_identifier")
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end
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defp get_field_value(packet_data, key) do
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if Map.has_key?(packet_data, key) and not is_nil(packet_data[key]) do
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packet_data[key]
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end
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end
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defp extract_from_data_extended(packet_data) do
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data_extended = Map.get(packet_data, :data_extended) || %{}
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# Try to extract from symbol information
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symbol_table_id = Map.get(data_extended, :symbol_table_id) || Map.get(data_extended, "symbol_table_id")
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symbol_code = Map.get(data_extended, :symbol_code) || Map.get(data_extended, "symbol_code")
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if symbol_table_id && symbol_code do
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"#{symbol_table_id}#{symbol_code}"
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end
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end
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end
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