Serial Reading Gibberish (if anything at all)

[RembiTime]

Hello!

I’ve been trying to get this library to work for hours and can’t figure something out. I’m using an Arduino Nano and have a very simple program running on it that just prints out “Hi” every second, along with a very simple infinite loop to print out whatever the Arduino sends in (code attached below). For some reason, no matter if I change the length of the string that the Arduino sends and how many bytes are available, the Arduino always outputs 4 seemingly random bytes and then stops each second. Any ideas why this could be?

Example output:

Port opened successfully
40
6f2a6c20
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
6f2a6c20
0
0
0
0
0
0
0
0
0
8
6f2a6c20
0
0
// Etc...

Arduino code:

void setup() {
// initialize serial:
Serial.begin(9600);
}

void loop() {
Serial.println("Hi");
delay(1000);
}

C++ code:

#include "include/serial/serial.h"
#include
#include "thread"
int main()
{
serial::Serial my_serial("/dev/cu.usbserial-210", 19200, serial::Timeout::simpleTimeout(3000));

if (my_serial.isOpen())
{
    std::cout << "Port opened successfully" << std::endl;
}
else
{
    std::cout << "Port failed to open" << std::endl;
}
my_serial.flushOutput();

while (true) {
    printf("%d\n", my_serial.available());
    if (my_serial.available() > 0) {
        std::string response = my_serial.read(my_serial.available());
        printf("%x\n", response);
    }
    std::this_thread::sleep_for(std::chrono::milliseconds(100));
}

}

Thank you!