QTcpSocket not Receiving Data Sent from Server - c++

Question

I'm having trouble sending data from a server to a client using Qt. Whenever I do QTcpSocket::waitForBytesWritten() after a call to QTcpSocket::write(...), it returns false.
I tried using the bytesWritten signal, but that never gets emitted, presumably because no data is able to be written, and no data is received on the client side.
The writeData method is what is being called in the MainWindow class, but to try and narrow down the cause of the problem, I moved the writing of data to the client into the newConnection method.
The message Connection received is printed to the output window. I'm sending the string Some random data in the newConnection method to the client for testing purposes, but this is not being received by the client (the code to output the received data on the client side is inside Character::readData() method).
The value of the returnValue variable is true, and the code returns from the call to the client->waitForBytesWritten(-1) method. client->errorString() gives Unknown error, and then the message Bytes written is printed (even though, evidently, nothing is written, but I'm just using it as a status message).
Server.cpp
#include "Server.h"
Server::Server(QObject *parent) : QObject(parent)
{
server = new QTcpServer(this);
qDebug() << connect(server, SIGNAL(newConnection()), SLOT(newConnection()));
qDebug() << connect(server, SIGNAL(bytesWritten()), SLOT(bytesWritten()));
qDebug() << "Listening:" << server->listen(QHostAddress::Any, 1451);
server->waitForNewConnection(-1);
}
void Server::newConnection()
{
qDebug("Connection received");
client = server->nextPendingConnection();
client->write("Some random data\n");
bool returnValue = client->flush();
qDebug() << "Return value: " << returnValue;
qDebug() << client->waitForBytesWritten(-1);
qDebug() << "Error: " << client->errorString();
qDebug() << "Bytes written";
}
void Server::bytesWritten(qint64 bytes)
{
qDebug() << "Bytes written: " << QString::number(bytes);
}
void Server::writeData(std::string data)
{
QByteArray byteArray = QByteArray(data.c_str());
qDebug() << "Write data: " << QString::fromStdString(data);
client->write(byteArray);
}
Client.cpp
#include "Client.h"
#include "mainwindow.h"
Client::Client(QObject* parent) : QObject(parent)
{
socket = new QTcpSocket(this);
(void)QObject::connect(socket, SIGNAL(connected()), this, SLOT(connected()));
qDebug() << "Connect signal" << QObject::connect(socket, SIGNAL(readyRead()), this, SLOT(readData()));
}
bool Client::connectToHost(QString host)
{
socket->connectToHost(host, 1451);
socket->waitForConnected();
qDebug() << "Error: " << QString::number(socket->error() == QAbstractSocket::UnknownSocketError);
return true;
}
void Client::connected()
{
qDebug("Socket is connected");
qDebug() << QString::number(socket->state() == QAbstractSocket::ConnectedState);
}
void Client::readData()
{
qDebug("Read data");
QTcpSocket* sender = static_cast<QTcpSocket*>(QObject::sender());
QByteArray data = sender->readAll();
std::string character = data.toStdString();
qDebug() << "Character received: " << QString::fromStdString(character);
MainWindow::characterReceived(character);
}