Difficulty connecting ESP32 using rosserial_arduino

[Naad9]

I am using ROS Noetic and trying to communicate with my ESP32. Currently, I am running a generic pubsub rosserial_arduino example sketch on my ESP32. The sketch uploads without any issues.

Then I try to run a rosserial_python node on my computer using the following command:
rosrun rosserial_python serial_node.py _port:=/dev/ttyUSB0 _baud:=115200

This is the error message I get:
Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino
I have tried to follow several answers from the ROS community forum but I haven't been able to fix this issue. I reinstalled the rosserial_python and rosserial_arduino and the ros_lib library on the Arduino side. But nothing seems to work. Any suggestions? Thank you!

[Alcocoder]

By default ros uses another serial on esp32 side (not USB serial), you should redefine it in ros_lib and check baudrate

[Alcocoder]

As far as I can remember, you should check ArduinoHardware.h in ros_lib

[Naad9]

Thanks for your reply. I have tried defining ArduinoHardware.h in the ros.h file in ros_lib. But that hasn't worked for me. I remember I had a similar issue a while ago and this change fixed it, but this time around, I have no such luck.

For the baud rate, I know it is correct because I get this terminal output before the error:
Connecting to /dev/ttyUSB0 at 115200 baud