No ROS2 topics and nodes on example publisher

## Issue template

- Hardware description: ESP32
- RTOS: NA
- Installation type: Docker
- Version or commit hash: humble
-
#### Steps to reproduce the issue
Upload micro-ros_publisher.ino onto an ESP32
Run `docker run -it --rm -v /dev:/dev --privileged --net=host microros/micro-ros-agent:humble serial --dev /dev/ttyUSB0 -v6`
Enter the container and run ros2 topic list

#### Expected behavior
Topics and Nodes appear as expected

#### Actual behavior
No communication with ros2

#### Additional information

Start by reproducing the issue with micro-ros_publisher.ino on an ESP32 and the documented microros/micro-ros-agent:humble Docker command. Run ros2 topic list after uploading the example and compare the result with the expected topics and nodes; done means communication works and the topics and nodes appear.

Written by the indexing model from the issue text.