• c stands for clean session apparently.

    c0: This indicates the clean session status. "c0" means that the clean session is set to false. When a client connects with a clean session set to true (c1), it means the broker should not store any subscriptions or undelivered messages for the client when it disconnects. With clean session set to false (c0), the broker will store subscriptions and undelivered messages for the client.

    p stand for QoS. So p2 would be QoS level 2.

    Take it with a pinch of salt until I've verified this as it's a quick ChatGPT search


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