Arduino for Ping on BlueROV

@Acuadros95 is already working on this.

Since Mar 23, 2023.

Hi everyone,

- Hardware Type: Arduino DUE
- Installation type: micro_ros_setup
- Version or commit hash: galactic
- Script on Arduino DUE: [example publisher](https://github.com/micro-ROS/micro_ros_arduino/blob/humble/examples/micro-ros_publisher/micro-ros_publisher.ino)

Premise: I asked the same question on the BlueRobotics forum ([here](https://discuss.bluerobotics.com/t/ping-with-arduino-using-micro-ros-possible/13911)), but unfortunately, I didn't get an answer -> I am doing something wrong on the micro ROS side.

I copy here the content:

Using ROS 2 on my laptop, I want to communicate with an Arduino DUE (with micro ROS running on it) connected to the companion computer of a BlueROV (Raspberry Pi 3 with a Pixhawk running [ArduSub](https://www.ardusub.com/)).

After setting up micro ROS on my Arduino DUE and testing the serial communication on my laptop (following [this](https://roboticsknowledgebase.com/wiki/interfacing/microros-for-ros2-on-microcontrollers/) tutorial), I confirmed that everything is working ok:

```shell
$ ros2 run micro_ros_agent micro_ros_agent serial --dev /dev/ttyACM0 -b 115200 -v6
[1678973917.856675] info | TermiosAgentLinux.cpp | init | running... | fd: 3
[1678973917.857069] info | Root.cpp | set_verbose_level | logger setup | verbose_level: 6
[1678973935.542156] info | Root.cpp | create_client | create | client_key: 0x0793D525, session_id: 0x81
[1678973935.542255] info | SessionManager.hpp | establish_session | session established | client_key: 0x0793D525, address: 0
[1678973935.542397] debug | SerialAgentLinux.cpp | send_message | [** <> **] | client_key: 0x0793D525, len: 19, data:
0000: 81 00 00 00 04 01 0B 00 00 00 58 52 43 45 01 00 01 0F 00
```
For what it's worth, I also tested the UDP connection in the [first application linux tutorial](https://micro.ros.org/docs/tutorials/core/first_application_linux/)

The next steps were:

1. connect the Arduino to the companion computer
2. create the serial port (baud rate _115200_) and the UDP port (_192.168.2.2:8888_) using the [routing procedure](https://www.ardusub.com/reference/companion/routing.html) recommended by them
3. communicate with the Arduino through the UDP using micro ROS on my topside laptop

But something is wrong:

```shell
$ ros2 run micro_ros_agent micro_ros_agent udp4 --ip 192.168.2.1 --port 8888
[1678974517.990334] info | UDPv4AgentLinux.cpp | init | running... | port: 8888
[1678974517.990704] info | Root.cpp | set_verbose_level | logger setup | verbose_level: 4
[1678974531.335043] error | InputMessage.cpp | log_error | deserialization error | buffer:
0000: 7E 00 00 18 00 80 00 00 00
[1678974532.326210] error | InputMessage.cpp | log_error | deserialization error | buffer:
0000: 7E 00
```
What were my mistakes?