CC2640R2F: CC2640R2F 修改MTU 从机判断修改成功标志

修改成功后会在串口打印MTU size信息

static uint8_t SimplePeripheral_processGATTMsg(gattMsgEvent_t *pMsg)
{
  if (pMsg->method == ATT_FLOW_CTRL_VIOLATED_EVENT)
  {
    // ATT request-response or indication-confirmation flow control is
    // violated. All subsequent ATT requests or indications will be dropped.
    // The app is informed in case it wants to drop the connection.

    // Display the opcode of the message that caused the violation.
    Display_printf(dispHandle, SP_ROW_STATUS_1, 0, "FC Violated: %d", pMsg->msg.flowCtrlEvt.opcode);
  }
  else if (pMsg->method == ATT_MTU_UPDATED_EVENT)
  {
    // MTU size updated
    Display_printf(dispHandle, SP_ROW_STATUS_1, 0, "MTU Size: %d", pMsg->msg.mtuEvt.MTU);
  }

  // Free message payload. Needed only for ATT Protocol messages
  GATT_bm_free(&pMsg->msg, pMsg->method);

  // It's safe to free the incoming message
  return (TRUE);
}