defmodule Foo.Client do
  use WebSockex
  require Logger

  @name __MODULE__
  @uri "..."

  def child_spec([]) do
    %{
      id: @name,
      start: {@name, :start_link, []},
    }
  end

  def start_link() do
    WebSockex.start_link(@uri, @name, :foo, name: @name)
  end

  def handle_frame({:text, msg}, state) do
    Logger.info msg
    raise "oops"
  end