micro-ROS publisher always printing "dat:0" on ROS2 echo instead of the updated values

[PrakruthiJP]

I am working on a TRAVEO™ T2G MCU (Infineon) running micro-ROS with a custom UART transport layer.
I have a simple publisher node sending std_msgs/msg/Int32 messages to the ROS 2 agent over UART.
The ROS 2 agent is running on my PC and is connected to the MCU via a serial link.

Environment:

MCU: TRAVEO™ T2G

micro-ROS library: rcl, rclc, rmw_microros

Host: Ubuntu 22.04 with ROS 2 Humble

Transport: Custom UART (shared with printf for debug)

2. The Problem

When I run:

ros2 topic echo /traveo_publisher

I do receive messages, but every message shows data: 0 instead of the expected value.

Example output:

data: 0
data: 0
data: 0

The messages are arriving periodically (so the publisher and transport are working).

The value never changes and is always 0.
3. What I Expected

I want to see the integer values that I set in my code, for example:

data: 123
data: 124
data: 125
...
so that the ROS 2 subscriber or ros2 topic echo shows live, updated values from my MCU.

I am working on a micro-ROS example on a TRAVEO™ T2G MCU using a custom UART transport. The code is based on the "data

MAIN.C 6.txt

" style micro-ROS publisher/subscriber example, but I have modified it slightly.

Here is the situation:

I have a publisher that is supposed to send an integer value (std_msgs/msg/Int32) periodically using a ROS timer.

I am running ros2 topic echo /traveo_publisher on the host PC to see the published messages this will give value never changes to from 0 . it is publishing periodically but within same incorrect value.

I am successfully connecting to the ROS 2 agent (no connection error), and I do see messages being published.

However, the message always shows data: 0 instead of the value I expect (for example 123 or incrementing numbers).

The value does not update continuously as I move around in my code or directory — it just stays the same in ROS 2 echo output.