Updates for the readme instruction to enable all necessary Zenoh ports in Ubuntu firewall

[s3938334]

Hi, I tried to put my Chinese noname CH340 ESP32 as a client, my laptop is the router, and run an API subsciber scipt later.

At first, I used the Arduino framework, but it always failed at opening a session, then I switched to ESPIDF framework, still failed there.

After ChatGPT, I put in a diagnotic code block and detected the problem is not Zenoh related, and I remember back when I installed ROS2 I had a problem with port 22 DDS and firewall, which prevented communication between RPI5 and laptop.

After allowing 7447 on my firewall VSC shows the ESP32 is publishing as intended. I am a robotics student, software and IT people may figure this out immediately, but I just want to help those who haven't known.

I am using ROS2 Jazzy, Ubuntu dual-boot 24. LTS. You may keep board as az-delivery-devkit-v4 with some flags and debug in .ini, but it will publish.

I assume this will be the same for other devices/ports that want to connect wireless to computers with firewall.