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This example shows the most basic usage of cosim.vhpidirect.VHPIDIRECT (see VHPIDIRECT) to interact with VUnit’s internal string_ptr/byte_vector_ptr (see Data Types) from C. cosim.vhpidirect.VHPIDIRECT.bridge() is used enable external mode support for string_ptr. Two equivalent testbenches are provided: one uses string_ptr and the other one byte_vector_ptr.