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Elixir Z-Wave library
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lib/grizzly/zwave/commands/switch_binary_report.ex
defmodule Grizzly.ZWave.Commands.SwitchBinaryReport do
@moduledoc """
Module for the SWITCH_BINARY_REPORT command
Params:
* `:target_value` - `:on`, `:off`, or `:unknown` (required)
* `:duration` - 0-255 (required V2)
* `:current_value` - `:on`, `:off`, or `:unknown` (required V2)
"""
@behaviour Grizzly.ZWave.Command
alias Grizzly.ZWave.{Command, DecodeError}
alias Grizzly.ZWave.CommandClasses.SwitchBinary
@type value() :: :on | :off | :unknown
@type param() :: {:target_value, value()} | {:duration, byte()} | {:current_value, value()}
@impl Grizzly.ZWave.Command
def new(opts) do
# TODO: validate opts
command = %Command{
name: :switch_binary_report,
command_byte: 0x03,
command_class: SwitchBinary,
params: opts,
impl: __MODULE__
}
{:ok, command}
end
@impl Grizzly.ZWave.Command
def encode_params(command) do
target_value_byte = encode_target_value(Command.param!(command, :target_value))
case Command.param(command, :current_value) do
nil ->
<<target_value_byte>>
current_value ->
duration = Command.param!(command, :duration)
current_value_byte = encode_target_value(current_value)
<<current_value_byte, target_value_byte, duration>>
end
end
def encode_target_value(:off), do: 0x00
def encode_target_value(:unknown), do: 0xFE
def encode_target_value(:on), do: 0xFF
@impl Grizzly.ZWave.Command
def decode_params(<<target_value_byte>>) do
case value_from_byte(target_value_byte) do
{:ok, target_value} ->
{:ok, [target_value: target_value]}
{:error, %DecodeError{}} = error ->
error
end
end
def decode_params(<<current_value, target_value, duration>>) do
with {:ok, target_value} <- value_from_byte(target_value),
{:ok, current_value} <- value_from_byte(current_value) do
{:ok,
[
target_value: target_value,
duration: duration,
current_value: current_value
]}
end
end
defp value_from_byte(0x00), do: {:ok, :off}
defp value_from_byte(0xFE), do: {:ok, :unknown}
defp value_from_byte(0xFF), do: {:ok, :on}
defp value_from_byte(byte),
do: {:error, %DecodeError{value: byte, param: :target_value, command: :switch_binary_report}}
end