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I have been following the documentation in every step, and I didn't face any errors. Configured, deployed and made a subscription to hello/world topic just as the documentation detailed. However, when I arrived at the testing step here: https://docs.aws.amazon.com/greengrass/latest/developerguide/lambda-check.html

No messages were showing up on the IoT console (subscription view hello/world)! I am using Greengrass core daemon which runs on my Ubuntu machine, it is active and listens to port 8000. I don't think there is anything wrong with my local device because the group was deployed successfully and because I see the communications going both ways on Wireshark.

I have these logs on my machine: /home/##/Desktop/greengrass/ggc/var/log/system/runtime.log:

[2019-09-28T06:57:42.492-07:00][INFO]-===========================================
[2019-09-28T06:57:42.492-07:00][INFO]-Greengrass Version: 1.9.3-RC3
[2019-09-28T06:57:42.492-07:00][INFO]-Greengrass Root: /home/##/Desktop/greengrass
[2019-09-28T06:57:42.492-07:00][INFO]-Greengrass Write Directory: /home/##/Desktop/greengrass/ggc
[2019-09-28T06:57:42.492-07:00][INFO]-Group File Directory: /home/##/Desktop/greengrass/ggc/deployment/group
[2019-09-28T06:57:42.492-07:00][INFO]-Default Lambda UID: 122
[2019-09-28T06:57:42.492-07:00][INFO]-Default Lambda GID: 127
[2019-09-28T06:57:42.492-07:00][INFO]-===========================================
[2019-09-28T06:57:42.492-07:00][INFO]-The current core is using the AWS IoT certificates with fingerprint.  {"fingerprint": "90##4d"}
[2019-09-28T06:57:42.492-07:00][INFO]-Will persist worker process info. {"dir": "/home/##/Desktop/greengrass/ggc/ggc/core/var/worker/processes"}
[2019-09-28T06:57:42.493-07:00][INFO]-Will persist worker process info. {"dir": "/home/##/Desktop/greengrass/ggc/ggc/core/var/worker/processes"} 
[2019-09-28T06:57:42.494-07:00][INFO]-No proxy URL found.
[2019-09-28T06:57:42.495-07:00][INFO]-Started Deployment Agent to listen for updates. [2019-09-28T06:57:42.495-07:00][INFO]-Connecting with MQTT.   {"endpoint": "a6##ws-ats.iot.us-east-2.amazonaws.com:8883", "clientId": "simulators_gg_Core"}
[2019-09-28T06:57:42.497-07:00][INFO]-The current core is using the AWS IoT certificates with fingerprint.  {"fingerprint": "90##4d"}
[2019-09-28T06:57:42.685-07:00][INFO]-MQTT connection successful.   {"attemptId": "GVko", "clientId": "simulators_gg_Core"}
[2019-09-28T06:57:42.685-07:00][INFO]-MQTT connection established.  {"endpoint": "a6##ws-ats.iot.us-east-2.amazonaws.com:8883", "clientId": "simulators_gg_Core"} 
[2019-09-28T06:57:42.685-07:00][INFO]-MQTT connection connected. Start subscribing. {"clientId": "simulators_gg_Core"} 
[2019-09-28T06:57:42.685-07:00][INFO]-Deployment agent connected to cloud. 
[2019-09-28T06:57:42.685-07:00][INFO]-Start subscribing.    {"numOfTopics": 2, "clientId": "simulators_gg_Core"}
[2019-09-28T06:57:42.685-07:00][INFO]-Trying to subscribe to topic $aws/things/simulators_gg_Core-gda/shadow/update/delta
[2019-09-28T06:57:42.727-07:00][INFO]-Trying to subscribe to topic $aws/things/simulators_gg_Core-gda/shadow/get/accepted
[2019-09-28T06:57:42.814-07:00][INFO]-All topics subscribed.    {"clientId": "simulators_gg_Core"}
[2019-09-28T06:58:57.888-07:00][INFO]-Daemon received signal: terminated. [2019-09-28T06:58:57.888-07:00][INFO]-Shutting down daemon. 
[2019-09-28T06:58:57.888-07:00][INFO]-Stopping all workers.
[2019-09-28T06:58:57.888-07:00][INFO]-Lifecycle manager is stopped.
[2019-09-28T06:58:57.888-07:00][INFO]-IPC server stopped.

/home/##/Desktop/greengrass/ggc/var/log/system/localwatch/localwatch.log:

[2019-09-28T06:57:42.491-07:00][DEBUG]-will keep the log files for the following lambdas    {"readingPath": "/home/##/Desktop/greengrass/ggc/var/log/user", "lambdas": "map[]"}   
[2019-09-28T06:57:42.492-07:00][WARN]-failed to list the user log directory {"path": "/home/##/Desktop/greengrass/ggc/var/log/user"}

Thanks in advance.

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1 回答 1

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我在另一个平台（Jetson Nano）上遇到了类似的问题。在阅读了使用 IOT Greengrass 设置简单 Lambda 的 AWS 说明后，我无法得到响应。在我寻找答案的过程中，我发现 AWS 有一个适用于您连接的任何设备的资格测试脚本。
它通过部署和测试 lambda 函数（以及其他功能）的自动化过程并报告每个步骤的结果，文档提供故障排除信息。
通过这些测试，我能够缩小设置、安装和配置的问题。测试文档给出了对测试结果进行故障排除的指导。这是测试的链接：https ://docs.aws.amazon.com/greengrass/latest/developerguide/device-tester-for-greengrass-ug.html

如果您点击“下一个主题”链接，它将带您完成完整的测试。让我警告你，它的范围很广，并且需要一些时间，但对我来说，它提供了很多详细的见解，而 hello world 没有。

于 2020-05-07T19:28:28.787 回答