What is the difference between "last_heard" and "last_handshake_at"?

I am displaying a variable value on a webpage, and also the time at which it was last updated. Which of these two values is the one I want, and what is the difference between them?

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I’d love to know the nuances of that also… my current thinking is that last_heard is literally that… when was the device last heard, and last handshake is when it last did a full authentication / and is also an indication of if the unit has rebooted or lost it’s link…