The genserver is only needed when a specific page is opened, and shouldn’t exist when none is on that page.
But adding it to application.ex makes it start even if none is on the page.

    children = [
      # ...
      {MyApp.MyGenserver, [etc_config]}
      MyApp.Endpoint
    ]

    opts = [strategy: :one_for_one, name: MyApp.Supervisor]
    Supervisor.start_link(children, opts)

When I place the call in the Liveview it launches an instance for everyone that is opening the page. And closes one after a page is closed.

  def mount(_params, _session, socket) do
    if connected?(socket) do
      Supervisor.start_link(
        [
          {MyApp.MyGenserver,
           [
             host: @ip,
             port: @port
           ]}
        ],
        strategy: :one_for_one
      )
    end

    { :ok, socket }
  end

I’m not sure what to try next. Could you point me in the right direction?
I know the following things exist, but not sure if they go in the right direction:

• DynamicSupervisor.start_child/2
• Register