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the github project didn't contain the iot/mqtt_example folder
The lab instructions pointed to a github repo that no longer includes the required content. The repo in question was https://github.com/GoogleCloudPlatform/nodejs-docs-samples . It no longer includes iot/mqtt sample code. That has since moved to https://github.com/googleapis/nodejs-iot . To find it i had to use "git log" on the original repo, and in the checkin comments they mentioned the new repo
The nodejs-docs-samples does not contain an IoT folder anymore
Since you haven't updated your source material it was nearly impossible to complete....
I can finish this lab, but there is no [nodejs-docs-samples/iot/mqtt_example], so can't complete it.
the nodejs master branch is no longer containing the iot folder
The git repository does not include the iot directory necessary to complete the lab (nodejs-docs-samples/iot/mqtt_example)
Couldn't 'cd nodejs-docs-samples/iot/mqtt_example' as folder iot does not exist within nodejs-docs-samples. Thus couldn't complete this Lab