why not check the data-plane liveness?

[Fufu Fang]

The meta-protocol runs on TCP. If UDP is down, it will fallback to TCP
only. 

It does say " Since version 1.0.10, tinc will automatically fall back
to TCP if direct communication via UDP is not possible." in the link
below: 
https://www.tinc-vpn.org/documentation/Solving-problems.html

FF

On Tue, 2020-02-04 at 21:43 +0800, Bright Zhao wrote:
> I saw the PING/PONG sent from meta-protocol, just wondering if meta
> is up but data is down, there is no way to detect?
> 
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