====== nodered ======
===== install =====
rspbberypi,debian,ubuntuなら
https://nodered.jp/docs/getting-started/raspberrypi
より
  bash <(curl -sL https://raw.githubusercontent.com/node-red/linux-installers/master/deb/update-nodejs-and-nodered)

===== 設定 =====
.node-red/setting.js
  * project機能

  // Customising the editor
  editorTheme: {
      projects: {
          // To enable the Projects feature, set this value to true
          //enabled: false
          enabled: true
      }
  }

====== dashboard ======

image表示(jpegをBASE64にしたものを表示)
  <img src="data:image/jpeg;base64,{{msg.payload}}" />


====== msgの操作 ======

===== function node =====
  msg.payload = {
    "field1": "value1",
    "field2": "value2"
  };
  return msg;