code: def oem(self):
          
          buf = (ctypes.c_char * self.MAX_BUF_SIZE)()
          res = self._dll.JLINKARM_GetOEMString(ctypes.byref(buf))
          if res != 0:
              raise errors.JLinkException('Failed to grab OEM string.')
  
          oem = ctypes.string_at(buf).decode()
          if len(oem) == 0:
              # In the case that the product is an original SEGGER product, then
              # the OEM string is the empty string, so there is no OEM.
              return None
  
          return oem
docs: Retrieves and returns the OEM string of the connected J-Link.
  
          Args:
            self (JLink): the ``JLink`` instance
  
          Returns:
            The string of the OEM.  If this is an original SEGGER product, then
            ``None`` is returned instead.
  
          Raises:
            JLinkException: on hardware error.