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Elixir Z-Wave library
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lib/grizzly/zwave/commands/multi_command_encapsulated.ex
defmodule Grizzly.ZWave.Commands.MultiCommandEncapsulated do
@moduledoc """
The Multi Command Encapsulated Command used to contain multiple Commands.
Params:
* `:commands` - the commands encapsulated in this one
"""
@behaviour Grizzly.ZWave.Command
alias Grizzly.ZWave.Command
@type param :: {:commands, [Command.t()]}
@impl Grizzly.ZWave.Command
def encode_params(_spec, command) do
commands = Command.param!(command, :commands)
count = Enum.count(commands)
encoded_commands =
for command <- commands, into: <<>> do
command_binary = Grizzly.ZWave.to_binary(command)
<<byte_size(command_binary), command_binary::binary>>
end
<<count>> <> encoded_commands
end
@impl Grizzly.ZWave.Command
def decode_params(_spec, <<_number_of_commands, commands_binary::binary>>) do
commands = decode_commands(commands_binary) |> Enum.reverse()
{:ok, [commands: commands]}
end
defp decode_commands(<<>>), do: []
defp decode_commands(<<length, command_binary::binary-size(length), others::binary>>) do
command = decode_command(command_binary)
[command | decode_commands(others)]
end
defp decode_command(
<<_command_class_byte, _command_byte, _encoded_params::binary>> = command_binary
) do
{:ok, command} = Grizzly.ZWave.from_binary(command_binary)
command
end
end