some question about GATT_WriteNoRsp

On Central, I use GATT_WriteNoRsp() to send data，but I can't receive any data on Peripheral.

when I use GATT_WriteCharValue to send data,can receive data.

static void sendData( void )
{

  uint8 status;

  attWriteReq_t REQ;
  REQ.handle = 0x35;
  REQ.len = 20;
  for(status=0;status<20;status++)REQ.pValue[status] = simpleBLERXBUF[status];
  REQ.sig = 0;
  REQ.cmd = 1;
  status = GATT_WriteNoRsp( simpleBLEConnHandle, &REQ );

}

GATT_WriteNoRsp 是用于central端的，请问你是central还是peripheral？

DEBUG  Peripheral node ， to see if data can be received?

on central

nothing received.

nothing received，but if I use GATT_WriteCharValue on Central，data can be received.