Topics are not being seen by ROS about rosserial_stm32

[yoneken]

Hi,
You have to launch rosserial_python to subscribe to topics from embedded devices.

[Abo3abed]

Thank you for your time!
But when I run
rosserial_python serial_node.py _port:= _baud:=
it gives me an error!
[ERROR] [1585574845.599400]: Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino

Do I have to add the stm32 project to CmakeList.txt or package.xml ? or even to have it inside the ros package workspace ?
Note: I'm using ros-melodic

[5730289021-NN]

I used to get that error and I fixed that by correcting the argument _baud in rosserial_python serial_node.py _port:= _baud:= to match the actual USART2 baudrate

[yoneken]

Thank you for your helpful advice!
Yes. You have to direct your actual device with the arguments. something like,

rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=38400

Actually, the default baudrate of rosserial is 38400.