I found the problem. Server won't close the connection if I sent a message.
If I add
if(socket.dataAvailableForRead) {
auto msg = socket.receiveText();
logInfo("Received: ", msg);
}
I get:
Task terminated with unhandled exception: Acquiring reader of already owned connection.
Error executing command run: Program exited with code -11
So I need something like in the broadcast example, according to http://forum.rejectedsoftware.com/groups/rejectedsoftware.vibed/thread/566/