Invalid OpenAPI specification for iot

[codesim]

Describe the bug

Want to simulate the iot API using prism. Failed due to invalid OpenAPI specification

Expected behavior

Redocly lint attests valid OpenAPI specification

Current behavior

Linter reveals several issues (wrongly used types, inproper definitions, ...) - 33 errors.
Spec is not valid

Possible solution

Check with OpenAPI conformance

Steps to reproduce

cd pan.dev/openapi-specs/iot
docker run --rm -v $(pwd):/spec redocly/cli lint /spec/iot.yaml