Issue with writing to QValueSpaceItem

Hello,
I have an issue. Writing to QValueSpaceItem is very slow as if something has blocked the executing. Here is the code:

void QCommDeviceController_Private::bringUp()
{
if (!m_sock)
return;

m_sock->write("UP\r\n");
}

There is no contentChanged signal for a long time.
Is there anyone having the same issue? How to fix it?

Make sure the socket (m_sock) is in a valid state before calling write. The write function does not perform the write immediately, instead among us queues it into the event loop.

You may also need to call flush() to force the buffer to actually be written to the socket.