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+# AWS IoT Greengrass用户手册
+AWS IoT Greengrass 是将云功能扩展到本地设备的软件。这使得设备可以更靠近信息源来收集和分析数据，自主响应本地事件，同时在本地网络上彼此安全地通信。本地设备还可以与 AWS IoT Core 安全通信并将 IoT 数据导出到 AWS 云。AWS IoT Greengrass 开发人员可以使用 AWS Lambda 函数和预构建的连接器来创建无服务器应用程序，这些应用程序将部署到设备上以进行本地执行。  
+
+AWS IoT Greengrass SDK支持IG902作为AWS IoT Greengrass核心（以下简称Greengrass核心）实现Lambda 函数的部署与本地执行、使用托管订阅在 AWS IoT 与设备、连接器和 Lambda 函数之间进行的 MQTT 消息传递等功能，使您能够快速开发并完成任务，安全，高效地部署相关服务。本文档将为你说明如何基于AWS IoT Greengrass SDK实现通过AWS云平台在IG902上部署并运行Hello World Lambda函数，该函数会通过MQTT协议将Hello World消息发送到 AWS IoT，整体架构如下图所示：  
+
+![](images/2020-08-17-17-13-44.png)
+
+  - [先决条件](#prerequisites)
+  - [1. 环境准备](#environmental-preparation)
+    - [1.1 配置AWS IoT](#configure-aws-iot)
+    - [1.2 配置IG902](#configure-ig902)
+      - [1.2.1 基础配置](#basic-configure)
+      - [1.2.2 连接AWS IoT Greengrass](#connect-to-aws-iot-greengrass)
+  - [2. 部署并验证Lambda函数](#deploy-and-verify-the-lambda-function)
+    - [2.1 部署Lambda函数](#deploy-the-lambda-function)
+    - [2.2 验证 Lambda 函数是否在核心设备上运行](#verify-the-lambda-function)
+  - [附录](#appendix)
+    - [Device Supervisor（Greengrass设备）与Greengrass核心通讯](#greengrass-device-and-greengrass-core-communication)
+      - [AWS IoT Greengrass组配置](#configuration-aws-iot-greengrass-group)
+      - [Device Supervisor配置](#configuration-device-supervisor)
+
+
+<a id="prerequisites"> </a>
+
+## 先决条件
+开始之前，你需要准备以下事项（如何获取IG902软件版本请联系客服）：
+- AWS IoT账户
+- IG902固件版本：`v2.0.0.r13054`及以上
+- AWS IoT Greengrass SDK版本：`1.10.2-RC1`及以上
+- Python SDK版本：`py3sdk-V1.4.0_Edge-IG9`及以上
+- IG902系列产品
+
+<a id="environmental-preparation"> </a>
+
+## 1. 环境准备
+
+  - [1.1 配置AWS IoT](#configure-aws-iot)
+  - [1.2 配置IG902](#configure-ig902)
+
+<a id="configure-aws-iot"> </a>
+
+### 1.1 配置AWS IoT
+如果你已经在AWS IoT Greengrass上配置了相应的Greengrass组和Greengrass核心，可以跳过这一小节。
+
+- 步骤1：登录AWS IoT Core 
+
+  访问AWS官网 https://aws.amazon.com/ 并登录控制台，登录控制台后选择“IoT Core”。  
+
+  ![](images/2020-07-28-14-26-00.png)  
+
+  ![](images/2020-07-28-14-28-30.png)  
+
+  登录“IoT Core”后页面如下所示：  
+
+  ![](images/2020-07-28-14-31-49.png)  
+
+- 步骤2：配置 AWS IoT Greengrass组  
+
+  参考[在 AWS IoT 上配置 AWS IoT Greengrass](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/gg-config.html)创建一个Greengrass组并下载核心的安全资源以备后续使用（无须下载AWS IoT Greengrass Core 软件安装包）。  
+
+- 步骤3：创建并打包Lambda函数
+
+  参考[创建并打包 Lambda 函数](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/create-lambda.html)创建并打包一个Hello World Lambda函数。<font color=#FF0000>注意：IG902仅支持运行时为`Python3.7`的Lambda函数。</font>
+
+- 步骤4：为 AWS IoT Greengrass 组配置 Lambda 函数
+
+  参考[为 AWS IoT Greengrass 配置 Lambda 函数](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/config-lambda.html)为Greengrass 组配置Lambda 函数。<font color=#FF0000>注意：IG902不支持Java 8 运行时，因此需要在Greengrass组设置页面上禁用流管理器。</font>
+
+<a id="configure-ig902"> </a>
+
+### 1.2 配置IG902
+
+  - [1.2.1 基础配置](#basic-configure)
+  - [1.2.2 连接AWS IoT Greengrass](#connect-to-aws-iot-greengrass)
+
+<a id="basic-configure"> </a>
+
+#### 1.2.1 基础配置
+如何配置IG902联网、更新软件版本等操作请参考[IG902快速使用手册](http://manual.ig.inhand.com.cn/zh_CN/latest/IG902%E5%BF%AB%E9%80%9F%E4%BD%BF%E7%94%A8%E6%89%8B%E5%86%8C.html)。更新AWS IoT Greengrass SDK时，取消勾选“启用AWS IoT Greengrass”。  
+
+![](images/2020-08-18-15-37-07.png)  
+
+随后点击“升级”按钮并选择相应的升级文件，选择后点击“确认”即可。  
+
+![](images/2020-08-18-15-38-50.png)
+
+<a id="connect-to-aws-iot-greengrass"> </a>
+
+#### 1.2.2 连接AWS IoT Greengrass
+进入IG902的“边缘计算 > 云厂商边缘计算 > AWS IoT Greengrass”页面，导入相应文件后勾选“启用AWS IoT Greengrass”。示例配置如下：  
+
+![](images/2020-08-18-15-53-42.png)  
+
+各项参数说明如下：  
+- 导入AWS IoT根CA：导入用于服务器身份验证的CA证书。AWS IoT Greengrass SDK中已经包含VeriSign Class 3 Public Primary G5 根 CA 证书”和”Amazon Root CA 1”，通常你无须再导入CA证书即可正常连接AWS IoT Greengrass。如需导入其他CA证书，可以从[这里](https://docs.aws.amazon.com/zh_cn/iot/latest/developerguide/server-authentication.html)下载相应的CA证书并导入（建议使用`Amazon Root CA 1`或`Starfield 根 CA 证书`）。<font color=#FF0000>目前不支持“Amazon Root CA 3”证书。</font>
+- 导入证书和密钥：导入[在 AWS IoT 上配置 AWS IoT Greengrass](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/gg-config.html)中创建Greengrass组时下载的核心的安全资源。
+- 导入配置文件：你可以参考[配置AWS IoT Greengrass核心](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/gg-core.html)修改AWS IoT Greengrass 核心软件的配置文件。<font color=#FF0000>导入证书和密钥后会自动生成Greengrass核心的配置文件，通常您可以直接使用而无须修改配置文件。</font>
+- 导出配置文件：你可以通过导出配置文件导出Greengrass核心的配置文件。
+- 导出日志文件：你可以导出Greengrass核心的运行日志以分析Greengrass核心的运行情况。
+
+配置完成后，勾选“启用AWS IoT Greengrass”以连接AWS IoT Greengrass。  
+
+![](images/2020-08-19-14-23-30.png)  
+
+<a id="deploy-and-verify-the-lambda-function"> </a>
+
+## 2. 部署并验证Lambda函数
+
+  - [2.1 部署Lambda函数](#deploy-the-lambda-function)
+  - [2.2 验证 Lambda 函数是否在核心设备上运行](#verify-the-lambda-function)
+
+<a id="deploy-the-lambda-function"> </a>
+
+### 2.1 部署Lambda函数
+参考[将云配置部署到核心设备](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/configs-core.html)从第3步开始将AWS IoT Greengrass配置部署到IG902上。
+
+<a id="verify-the-lambda-function"> </a>
+
+### 2.2 验证 Lambda 函数是否在核心设备上运行
+参考[验证 Lambda 函数是否在核心设备上运行](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/lambda-check.html)测试Lambda函数是否已正常部署并运行在IG902上。
+
+<a id="appendix"> </a>
+
+## 附录
+
+<a id="greengrass-device-and-greengrass-core-communication"> </a>
+
+### Device Supervisor（Greengrass设备）与Greengrass核心通讯
+IG902的AWS IoT Greengrass功能使IG902作为Greengrass核心，而运行在IG501/902上的Device Supervisor可以使IG501/902作为Greengrass设备<font color=#FF0000>(需要Device Supervisor 1.2.6及以后版本)</font>。配置后的Greengrass设备和Greengrass核心可以进行MQTT通讯以实现核心与设备的数据交互，详细说明请参考[AWS IoT Greengrass组中的设备交互](https://docs.aws.amazon.com/greengrass/latest/developerguide/module4.html)。  
+以下以一台IG902作为Greengrass核心，一台IG902运行Device Supervisor作为Greengrass设备并与Greengrass核心通讯为例进行说明（两台IG902处于同一局域网），整体拓扑如下：  
+
+![](images/2020-10-12-17-52-50.png)
+
+<a id="configuration-aws-iot-greengrass-group"> </a>
+
+#### AWS IoT Greengrass组配置
+参照[1.1 配置AWS IoT](#configure-aws-iot)配置Greengrass组，配置完成参考如下流程后为Greengrass组添加设备和相应订阅信息：  
+- 添加设备
+
+  进入“Greengrass > 组”页面，选择相应的Greengrass组并进入“设备”页面，点击“添加设备”。  
+
+  ![](images/2020-10-12-13-34-08.png)  
+
+  选择“创建新设备”。（不建议使用“选择IoT物品”，可能会导致Greengrass核心和Greengrass设备无法正常通讯）  
+
+  ![](images/2020-10-12-13-36-20.png)  
+
+  配置设备名称并点击“下一步”。  
+
+  ![](images/2020-10-12-13-38-29.png)  
+
+  点击“使用默认设置”并下载安全凭证。  
+
+  ![](images/2020-10-12-13-38-52.png)  
+
+  ![](images/2020-10-12-13-41-54.png)  
+
+- 配置订阅消息
+
+  在Greengrass组的“订阅”页面配置Lambda函数发送给Greengrass设备的订阅消息，如何配置请参考[为 AWS IoT Greengrass 配置 Lambda 函数](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/config-lambda.html)。  
+
+  ![](images/2020-10-12-13-50-37.png)  
+
+配置完成后，参考[将云配置部署到核心设备](https://docs.aws.amazon.com/zh_cn/greengrass/latest/developerguide/configs-core.html)从第3步开始将AWS IoT Greengrass配置部署到IG902上。
+
+<a id="configuration-device-supervisor"> </a>
+
+#### Device Supervisor配置
+- 配置与Greengrass核心的连接
+
+  参考[AWS IoT使用说明](http://app.ig.inhand.com.cn/zh_CN/latest/AWSIoT-CN.html)中的第一章在IG902配置Device Supervisor正常运行。随后进入“边缘计算 > 设备监控 > 云服务”页面配置与AWS IoT Greengrass核心的连接。示例配置如下：  
+
+  ![](images/2020-10-12-17-15-51.png)  
+
+  各项参数说明如下：  
+  - `类型`：连接AWS IoT时，选择“AWS IoT”
+  - `终端节点类型`：与Greengrass核心通讯时选择“Greengrass Core”
+  - `终端节点`：AWS IoT的终端节点地址，可从AWS IoT的“设置”页面获取。<font color=#FF0000>使用“VeriSign Class 3 Public Primary G5 根 CA 证书”时，请删除地址中的“-ats”</font>  
+
+    ![](images/2020-08-05-16-17-25.png)
+
+  - `MQTT客户端ID`：Greengrass组中的设备名称
+  - `物品的证书`：导入创建物品时下载的压缩包中的物品证书
+  - `私有密钥`：导入创建物品时下载的压缩包中的私有秘钥（后缀为“private.key”）
+  - `CA证书`：导入用于服务器身份验证的CA证书，你可以从[这里](https://docs.aws.amazon.com/zh_cn/iot/latest/developerguide/server-authentication.html)下载相应的CA证书（建议使用`Amazon Root CA 1`或`Starfield 根 CA 证书`）。<font color=#FF0000>目前不支持“Amazon Root CA 3”证书</font>  
+  - 其余项使用默认配置即可
+
+    ![](images/2020-08-05-16-18-44.png)  
+
+- 配置与Greengrass核心的通讯
+
+  在订阅消息中增加一条如下订阅并将接收到的数据打印到App日志中。  
+
+  ![](images/2020-10-12-17-43-00.png)  
+
+在“Python边缘计算”页面点击查看“device_supervisor”的运行日志，可以看到日志中打印Hello World Lambda函数发布的“hello/world”主题的负载信息。  
+
+![](images/2020-10-12-17-43-29.png)  
+
+![](images/2020-10-12-17-47-27.png)
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