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Added rostopic echo /rosout message to the post.
In addition, I added my MCU debugging screen to check topic msg.
Can we solve the problem now?

My MCU code, same as Arduino example

#include <ros.h>
#include <std_msgs/String.h>

#include "F28x_Project.h"

__interrupt void SCIB_RxIsr(void);

Uint32 BackTicker=0;

ros::NodeHandle nh;
std_msgs::String str_msg;
ros::Publisher chatter("chatter", &str_msg);

char hello[13] = "hello world!";

void main(void)
{
    nh.initNode();
    nh.advertise(chatter);

    while(1)
    {
        BackTicker++;
        str_msg.data = hello;
        chatter.publish( &str_msg );
        nh.spinOnce();
        DELAY_US(1000*100);
    }
}

When not to use the delay function.

function: "<module>"
line: 86
topics: [/rosout]
---
header:
  seq: 3
  stamp:
    secs: 1618364857
    nsecs: 901356935
  frame_id: ''
level: 2
name: "/serial_node"
msg: "Requesting topics..."
file: "SerialClient.py"
function: "SerialClient.requestTopics"
line: 404
topics: [/diagnostics, /rosout]
---header:
  seq: 2
  stamp:
    secs: 1618364855
    nsecs: 788872957
  frame_id: ''
level: 2
name: "/serial_node"
msg: "Connecting to /dev/ttyUSB0 at 57600 baud"
file: "serial_node.py"
function: "<module>"
line: 86
topics: [/rosout]
---
header:
  seq: 3
  stamp:
    secs: 1618364857
    nsecs: 901356935
  frame_id: ''
level: 2
name: "/serial_node"
msg: "Requesting topics..."
file: "SerialClient.py"
function: "SerialClient.requestTopics"
line: 404
topics: [/diagnostics, /rosout]
---

When using the delay function.

header:
  seq: 6
  stamp:
    secs: 1618365337
    nsecs: 803142070
  frame_id: ''
level: 8
name: "/serial_node"
msg: "Lost sync with device, restarting..."
file: "SerialClient.py"
function: "SerialClient.run"
line: 461
topics: [/diagnostics, /rosout]
---
header:
  seq: 7
  stamp:
    secs: 1618365337
    nsecs: 809052944
  frame_id: ''
level: 2
name: "/serial_node"
msg: "Requesting topics..."
file: "SerialClient.py"
function: "SerialClient.requestTopics"
line: 404
topics: [/diagnostics, /rosout]