On Mon, 29 Jun 2020 10:14:09 +0200
"R.Wieser"  wrote:

> Not quite.   My basic idea was/is to have the Pi to respond to a connect
> request on a single port only, and than, when both sides have connected
> (their actions, not the Pi's), transfer datapackets from one interface
> (socket) to the other.

 OK this is certainly possible but not off-the-shelf behaviour, I
think you should be able to persuade nc to do it.

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