Fix error starting application

lib/chronoscope/application.ex

@@ -17,7 +17,6 @@ defmodule Chronoscope.Application do
       # {Chronoscope.Worker, arg},
       {DynamicSupervisor, name: Chronoscope.DynamicSupervisor, strategy: :one_for_one},
       {Task.Supervisor, name: Chronoscope.TaskSupervisor},
-      Chronoscope.NTS.Client,
       # Start to serve requests, typically the last entry
       ChronoscopeWeb.Endpoint
     ]

lib/chronoscope/nts.ex

@@ -14,13 +14,14 @@ defmodule Chronoscope.NTS do
   end
 
   def list() do
-    DynamicSupervisor.count_children(Chronoscope.DynamicSupervisor)
-    |> IO.inspect()
+    Chronoscope.DynamicSupervisor
+    |> DynamicSupervisor.which_children()
+    |> Enum.map(fn {_, pid, _, _} -> GenServer.call(pid, :list) end)
   end
 
   def key_establishment(host, port) do
     # todo don't use atoms for this
-    name = String.to_atom("#{host}#{port}")
+    name = String.to_atom("#{host}:#{port}")
 
     if GenServer.whereis(name) == nil do
       DynamicSupervisor.start_child(Chronoscope.DynamicSupervisor, {NTS.Client, name: name})