code: def write(self, data):
          
  
          report_size = self.packet_size
          if self.ep_out:
              report_size = self.ep_out.wMaxPacketSize
  
          for _ in range(report_size - len(data)):
              data.append(0)
  
          self.read_sem.release()
  
          if not self.ep_out:
              bmRequestType = 0x21              #Host to device request of type Class of Recipient Interface
              bmRequest = 0x09              #Set_REPORT (HID class-specific request for transferring data over EP0)
              wValue = 0x200             #Issuing an OUT report
              wIndex = self.intf_number  #mBed Board interface number for HID
              self.dev.ctrl_transfer(bmRequestType, bmRequest, wValue, wIndex, data)
              return
              #raise ValueError('EP_OUT endpoint is NULL')
  
          self.ep_out.write(data)
          #logging.debug('sent: %s', data)
          return
docs: write data on the OUT endpoint associated to the HID interface