步驟 1：建立 AWS IoT 政策

建立允許 Raspberry Pi 連線和傳送訊息 AWS IoT 的政策 AWS IoT。

1. 在 AWS IoT 主控台中，如果 Get started (開始) 按鈕出現，請選擇它。否則，請在導覽窗格中展開 Security (安全性)，然後選擇 Policies (政策)。

2. 如果 You don’t have any policies yet (您尚未有任何政策) 對話方塊出現，請選擇 Create a policy (建立政策)。否則，請選擇 Create (建立)。

3. 輸入 AWS IoT 政策的名稱 （例如 MoistureSensorPolicy)。

4. 在 Add statements (新增陳述式) 區段中，將現有政策取代為下列 JSON。以您的 和 AWS 帳戶 號碼取代區域 AWS 區域 和帳戶。

   JSON

   {
       "Version": "2012-10-17",
       "Statement": [
           {
               "Effect": "Allow",
               "Action": "iot:Connect",
               "Resource": "arn:aws:iot:us-east-1:111122223333:client/RaspberryPi"
           },
           {
               "Effect": "Allow",
               "Action": "iot:Publish",
               "Resource": [
                   "arn:aws:iot:us-east-1:111122223333:topic/$aws/things/RaspberryPi/shadow/update",
                   "arn:aws:iot:us-east-1:111122223333:topic/$aws/things/RaspberryPi/shadow/delete",
                   "arn:aws:iot:us-east-1:111122223333:topic/$aws/things/RaspberryPi/shadow/get"
               ]
           },
           {
               "Effect": "Allow",
               "Action": "iot:Receive",
               "Resource": [
                   "arn:aws:iot:us-east-1:111122223333:topic/$aws/things/RaspberryPi/shadow/update/accepted",
                   "arn:aws:iot:us-east-1:111122223333:topic/$aws/things/RaspberryPi/shadow/delete/accepted",
                   "arn:aws:iot:us-east-1:111122223333:topic/$aws/things/RaspberryPi/shadow/get/accepted",
                   "arn:aws:iot:us-east-1:111122223333:topic/$aws/things/RaspberryPi/shadow/update/rejected",
                   "arn:aws:iot:us-east-1:111122223333:topic/$aws/things/RaspberryPi/shadow/delete/rejected"
               ]
           },
           {
               "Effect": "Allow",
               "Action": "iot:Subscribe",
               "Resource": [
                   "arn:aws:iot:us-east-1:111122223333:topicfilter/$aws/things/RaspberryPi/shadow/update/accepted",
                   "arn:aws:iot:us-east-1:111122223333:topicfilter/$aws/things/RaspberryPi/shadow/delete/accepted",
                   "arn:aws:iot:us-east-1:111122223333:topicfilter/$aws/things/RaspberryPi/shadow/get/accepted",
                   "arn:aws:iot:us-east-1:111122223333:topicfilter/$aws/things/RaspberryPi/shadow/update/rejected",
                   "arn:aws:iot:us-east-1:111122223333:topicfilter/$aws/things/RaspberryPi/shadow/delete/rejected"
               ]
           },
           {
               "Effect": "Allow",
               "Action": [
                   "iot:GetThingShadow",
                   "iot:UpdateThingShadow",
                   "iot:DeleteThingShadow"
               ],
               "Resource": "arn:aws:iot:us-east-1:111122223333:thing/RaspberryPi"
           }
       ]
   }
   

5. 選擇建立。