Docker SEBP/ELK not logging IP msgs

I'm new to the stack but struggling for 2 weeks now and not making any progress.

What I am trying to do is logging messages made by my IoT devices (EPS8266). I have the docker container running on the latest Ubuntu server sw, latest docker version, latest ELK container.
I'm running on ESXi or Virtual box (both available); I experience no differences between them.

I installed the SEBP/ELK docker image and it is running. Manually creating log-entries by:
/opt/logstash/bin/logstash -e 'input { stdin { } } output { elasticsearch { hosts => ["localhost"] } }'
works well, I see the messages when I connect to KIBANA.

I'm confused by the mapping of this installation (/OPT) and am not able to find the right config/plugin maps.
But what I do is according to the LOGSTASH video, installing pluggin FINGERPRINT (not sure if I need it) and it validates and installs well:
/opt/logstash/bin/logstash-plugin install logstash-filter-fingerprint

And after that I give:
/opt/logstash/bin/logstash -e 'input { tcp { port => "5000" } } output { elasticsearch { hosts => ["localhost"] } }'
and logstash starts succesful and is listening to

But issuing a (on a linux mint netbook):
echo "Test message." | nc 5000
does absolutely nothing (replacing TCP by UDP doesnt work either).

Anyone knows what I am doing wrong?

I do have other questions about the maps used (not able to save the pipeline), but it should work like this, right?

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