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Elixir Z-Wave library
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lib/grizzly/zwave/commands/sensor_multilevel_get.ex
defmodule Grizzly.ZWave.Commands.SensorMultilevelGet do
@moduledoc """
This module implements command SENSOR_MULTILEVEL_GET of command class COMMAND_CLASS_SENSOR_MULTILEVEL.
The command is used to request the current reading from a multilevel sensor.
Params: * `:sensor_type` - `one of :temperature or :illuminance or :power or :humidity` etc.(v5)
* `:scale` - ` 0..3 - identifies a unit of measurement` (v5)
"""
@behaviour Grizzly.ZWave.Command
alias Grizzly.ZWave.{Command, DecodeError}
alias Grizzly.ZWave.CommandClasses.SensorMultilevel
# See Grizzly.ZWave.CommandClasses.SensorMultilevel for the full list of possible sensor types
@type sensor_type :: atom
@type param :: {:sensor_type, sensor_type} | {:scale, 0..3}
@impl true
@spec new([param()]) :: {:ok, Command.t()}
def new(params) do
command = %Command{
name: :sensor_multilevel_get,
command_byte: 0x04,
command_class: SensorMultilevel,
params: params,
impl: __MODULE__
}
{:ok, command}
end
@impl true
def encode_params(command) do
case Command.param(command, :sensor_type) do
nil ->
<<>>
sensor_type ->
scale = Command.param!(command, :scale)
sensor_type_byte = SensorMultilevel.encode_sensor_type(sensor_type)
<<sensor_type_byte, 0x00::size(3), scale::size(2), 0x00::size(3)>>
end
end
@impl true
# v1 - v4
def decode_params(<<>>) do
{:ok, []}
end
# v5
def decode_params(<<sensor_type_byte, _::size(3), scale::size(2), _::size(3)>>) do
with {:ok, sensor_type} <- SensorMultilevel.decode_sensor_type(sensor_type_byte) do
{:ok, [sensor_type: sensor_type, scale: scale]}
else
{:error, %DecodeError{}} = error ->
error
end
end
end