Modbus packets not working on the nucleo stm32h743zg

[thechordmaster]

I am trying to port the ardustim code https://gitlab.com/sampokong/ardu-stim to a nucleo board. a python based GUI will send cam/crank wheel definitions to the nucleo (connected to a w5500 module) over modbus tcp and suitable signals will be generated on the nucleo pins. while the modbus commands are being sent successfully, the board is not able to receive the packets to execute the signals. attaching the arduino code and the gui code. Any help is appreciated.
gui copy.txt
knockfinalcode_v3 copy.txt

[fpistm]

Hi @thechordmaster
Hard to help on this. Looking at your code, I would simply advise to add extern "C" before each HAL callback/handler.
ex:
extern "C" void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc) {

Else maybe ask on the forum, maybe someone already worked on this.