micro-ROS Agent on Raspberry 5 with /dev/AMA0 does not work

Hello,

I have setup a micro ROS Agent on a Raspberry PI 5 and connected to microROS client with UART. The UART on the PI is connected to Pin14/Pin15 (Rx/Tx) with /dev/AMA0. Which does not work. I get no connection to client.

If I connect a FTDI USB-UART serial adapter the USB port and connect the agent to port /dev/ttyUSB0 it does work as expected.

The UART AMA0 connection to my PC does work, which I have tested with the minicom terminal and hTerm

This is my setup
- Hardware description: Raspberry Pi 5
- RTOS: Ubuntu 24.04
- Installation type: micro-ROS Agent
- Version or commit hash: micro-ROS iron

Does anyone have an idea why it does not work with the onboard UART. Are there any special settings I need to make?

many thanks in advanced

Start by checking the Raspberry Pi 5 onboard UART configuration for /dev/AMA0 and compare it with the working FTDI setup on /dev/ttyUSB0. Review the reported Ubuntu 24.04 and micro-ROS Iron setup, then verify that the Agent can establish a connection through the onboard UART without changing the client.

Written by the indexing model from the issue text.