Google IOT Core Setup Error

General
#1
  1. My goal is: To connect my esp32 to google iot core
  2. My actions are: ran mos gcp-iot-setup command
  3. The result I see is: error: google: could not find default credentials
  4. My expectation & question is: what does this error mean? How do I solve this?
#2

You solve it … by reading the docs…

https://mongoose-os.com/docs/mongoose-os/cloud/google.md

#3

I have the same problem. But some month ago I connect ESP to IOT core without problem.
By my opinion, it is connected with gcloud command
gcloud projects add-iam-policy-binding YOUR_PROJECT_NAME --member=serviceAccount:cloud-iot@system.gserviceaccount.com --role=roles/pubsub.publisher, but this command runs without problems and show a lot of credentials.
I tried to add credentials through Googlу Console, load json with key and add it to enviroment - it does not help me. Have anybody sugestion for this problem?

#4

This did not solve it for me. I am using an ESP32 with the SSD1306 mounted on the dev board.