Messages controller that receives message from user and sends it to Wit. Complete project at https://github.com/zabirauf/witai_elixir_weather_bot

messages_controller.ex

defmodule EchoBot.MessagesController do  
  use MicrosoftBot.Phoenix.Controller
  alias ExMicrosoftBot.Models.Message

  def message_received(conn, %Message{} = message) do
    session_id = message.conversationId

    spawn fn ->
      %{from: from, to: to, id: msgId} = message
      context = %{"session" => %{
          "from" => from, 
          "to" => to, 
          "msgId" => msgId}}

      Wit.run_actions(get_wit_access_token, session_id, EchoBot.WeatherConversationAction, message.text, context, 10)
    end

    resp(conn, 200, "")
  end

  defp get_wit_access_token() do
    Application.get_env(:koinbot, :wit_access_token)
  end
end