code: def _send_notification(self, handle, value):
          
  
          value_len = len(value)
          value = bytes(value)
  
          payload = struct.pack("<BHB%ds" % value_len, 0xFF, handle, value_len, value)
  
          response = self._send_command(2, 5, payload)
          result, = unpack("<H", response.payload)
          if result != 0:
              return False, {'reason': 'Error code from BLED112 notifying a value', 'code': result, 'handle': handle, 'value': value}
  
          return True, None
docs: Send a notification to all connected clients on a characteristic
  
          Args:
              handle (int): The handle we wish to notify on
              value (bytearray): The value we wish to send