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grizzly
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0.4.2
Elixir Z-Wave library
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lib/grizzly/seq_number.ex
defmodule Grizzly.SeqNumber do
@moduledoc """
Used for managing sequence numbers.
According to Z-Wave Network documentation we have to
have a global seq number between the values 0x00 and 0xFF (0 - 255).
This process is used for getting the current sequence number and incrementing
the number correctly. After hitting 0xFF (255) the numer will start back at 0x00 (0).
This is process is only meant to be used internal to the application.
"""
use GenServer
def start_link(start_number) do
GenServer.start_link(__MODULE__, start_number, name: __MODULE__)
end
@spec get_and_inc() :: non_neg_integer
def get_and_inc() do
GenServer.call(__MODULE__, :get_and_inc)
end
@impl true
def init(start_number) do
{:ok, start_number}
end
@impl true
def handle_call(:get_and_inc, _from, number) do
{:reply, number, inc(number)}
end
defp inc(0xFF) do
0x00
end
defp inc(n), do: n + 1
end