How to properly slow down traffic on Raspberry?

[wawanUnic]

Hello.
Tell me how to properly slow down traffic on Raspbian?
I only use a wired connection.
I do this (Raspbian on Raspberry Pi):

0. I checked the read-write speed before the experiment:
   
   
1. Installed iptables, iproute2 (with tc package)
2. Installed tcconfig curl -sSL https://raw.githubusercontent.com/thombashi/tcconfig/master/scripts/installer.sh | sudo bash
3. Set the traffic limit to eth0 with the command from the example:
   sudo tcset eth0 --rate 100Kbps
4. I checked this installation with the command from the example:
   {
   "eth0": {
   "outgoing": {
   "protocol=ip": {
   "filter_id": "800::800",
   "rate": "100Kbps"
   }
   },
   "incoming": {}
   }
   }
5. I check the read-write speed via FTP:
   
   
   Nothing changed...

Question for the experts: what am I doing wrong?
Are there other working means to slow down traffic?
Maybe the Raspberry Pi needs a different solution?
Thanks for answers.

[thombashi]

Thank you for your report.

The reason the tc settings don't work is probably because you're using FTP.
Currently, tcconfig can only set protocol={ip|ip6}.
This does not work for FTP.
By making protocol=all configurable, it may be possible to enable tc settings for FTP as well.