at the moment the problems do not lie in the connection between the ESP and the STM but rather with the STM board and how it is connected to the box. If we want to test the box via software that needs to be written on the STM and not on our board as we do not have direct connection with the box. If this is too complicated then the next best solution would be a manual hardware test of the different components of the box, if this is possible, It is extremely difficult for us to identify the wires when they are not marked correctly.