Connecting directly to Google Pub/Sub from ESP32 device

Since Google IoT Core is deprecated, I want to publish a topic directly from my ESP32 device to Google Pub/Sub (without MQTT broker server).

I went through this article but could not find a code sample or client library to use. Connessione del dispositivo a Pub/Sub a Google Cloud  |  Cloud Architecture Center https://cloud.google.com/pubsub/docs/reference/libraries

Appreciate assistance,
Thanks

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