Node-Red 模擬 RFID UID產生器 暨 LED ON,OFF 接收器

 Node-Red 模擬 RFID UID產生器 暨 LED ON,OFF 接收器

1) 利用亂數產生器 產生8個 hex 碼 RFID UID code

    送給 broker.mqtt-dashboard.com : 1883  

     TOPIC :  alex9ufo/node-red/RFID

2) 接收 broker.mqtt-dashboard.com : 1883 ,  TOPIC :  alex9ufo/node-red/LED  payload: on , off 的訊息 並控制 Dashboard UI的LED節點

on 變成綠色LED , off 變成紅色LED 

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