Start mDNS when there is at least 9.1. kernel version (#37)

lib/ex_ice/priv/app.ex

@@ -2,9 +2,36 @@ defmodule ExICE.Priv.App do
  @moduledoc false
  use Application
 
+ require Logger
+
  @impl true
  def start(_type, _args) do
- children = [{ExICE.Priv.MDNS.Resolver, :gen_udp}]
+ kernel_ver = kernel_version()
+
+ children =
+ if kernel_ver >= {9, 1} do
+ [{ExICE.Priv.MDNS.Resolver, :gen_udp}]
+ else
+ Logger.warning("""
+ Not starting MDNS resolver as it requires kernel version >= 9.1.
+ Detected kernel version: #{inspect(kernel_ver)}
+ """)
+
+ []
+ end
+
  Supervisor.start_link(children, strategy: :one_for_one)
  end
+
+ defp kernel_version() do
+ ver =
+ Application.spec(:kernel, :vsn)
+ |> to_string()
+ |> String.split(".")
+
+ major = Enum.at(ver, 0) |> String.to_integer()
+ minor = Enum.at(ver, 1) |> String.to_integer()
+
+ {major, minor}
+ end
 end