The signal source is a push_button widget click. I change the widget name on click, and then call the main window to set up listener. The name change happens but the main window is not called.

Can someone please spot the glaring error in what I am trying to do?

@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtWidgets>
#include "dynamicplots.h"
#include "dispdata.h"
#include "cprServer.h"

namespace Ui {
class MainWindow;
}
class dynamicPlots;
class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget parent = 0);
~MainWindow();
void setPlotWindow(dynamicPlots dp);

private slots:
void updatePeak(int val, int index);
void on_quitButton_clicked();
void slotAcceptUserLogin(QString&,QString&);
void on_pbFiles_clicked();
void setUpListener(bool);

private:

dynamicPlots *dPlot;
Ui::MainWindow *ui;
 dispData* rawData;
 cprServer* server;
 int newPeak;
 int newRecoil;
 int newRate;
 int newTime;

};

#endif // MAINWINDOW_H
#ifndef DYNAMICPLOTS_H
#define DYNAMICPLOTS_H

#include <QMainWindow>
#include "qcustomplot.h"
namespace Ui {
class dynamicPlots;
}

class dynamicPlots : public QMainWindow
{
Q_OBJECT

public:
explicit dynamicPlots(QWidget *parent = 0);
~dynamicPlots();
void plotRealTime(QCustomPlot *plotW);
void updateDepth(int);
void updatePeakGraph(int val, double index);
void setRate(int rate);
void updateRecoilGraph(int val,double index);
void updateRateGraph(int val,double index);

signals:
void startCPR(bool);

public slots:
void updatePeakGraph(int val, int index);
void on_pbCPR_clicked();
// void realtimeDataSlot();

// void on_dial_valueChanged(int value);

private slots:

private:
Ui::dynamicPlots *ui;
QTimer dataTimer;
};

#endif // DYNAMICPLOTS_H
#include "dynamicplots.h"
#include "ui_dynamicplots.h"

dynamicPlots::dynamicPlots(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::dynamicPlots)
{
ui->setupUi(this);
plotRealTime(ui->plotW);
ui->plotW->replot();

}

dynamicPlots::~dynamicPlots()
{
delete ui;
}

void dynamicPlots::updatePeakGraph(int val,int index)
{
double key = index/2000.0;

static double lastPointKey = 0;
ui->plotW->graph(0)->addData(key,val);
ui->plotW->xAxis->setRange(key, 1.5, Qt::AlignRight);
ui->plotW->graph(0)->rescaleValueAxis();
ui->plotW->replot();
updateDepth(val);

}

void dynamicPlots::setRate(int rate)
{
ui->rateVal->setObjectName(QString::number(rate));
}

void dynamicPlots::on_pbCPR_clicked()
{
if (ui->pbCPR->text() == "Start CPR")
{
ui->pbCPR->setText("Finished CPR");
qDebug()<<"Emitting Started CPR";
bool start = true;

    emit(startCPR(start));

}

}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "cprserver.h"
#include "logindialog.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
const QString IP = "127.0.0.1";
const ushort port = 8100;
ui->setupUi(this);
rawData = new dispData (this);
server = new cprServer(this,rawData,port);
dPlot=new dynamicPlots(this);
connect(rawData,SIGNAL(newPeakDepth(int,int)),this,SLOT(updatePeak(int, int)));
connect(dPlot,SIGNAL(startCPR(bool)),this,SLOT(setUpListener(bool)));
}

MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::updatePeak(int val,int index)
{
newPeak=val;
newTime=index;
double time = newTime/2000.0;
this->dPlot->updateDepth(newPeak);
this->dPlot->updatePeakGraph(newPeak,time);

}

void MainWindow::on_quitButton_clicked()
{
close();
}

void MainWindow::on_pbFiles_clicked()
{
LoginDialog* logDlg = new LoginDialog( this );
connect( logDlg,
SIGNAL(acceptLogin(QString&,QString&,int&)),
this,
SLOT(slotAcceptUserLogin(QString&,QString&)));

//setUpListener();
this->hide();
logDlg->show();
//dPlot->show();

}

void MainWindow::setUpListener(bool start)
{
const QString IP = "127.0.0.1";
const ushort port = 8100;
QHostAddress host;
qDebug()<<"Inside Set Up for Listening "<<start;
host.setAddress(IP);
//server->setRawData(rawData);
if (!server->listen(host,port)) {
QMessageBox::critical(this, tr("CPR Server"),
tr("Unable to start the server: %1.")
.arg(server->errorString()));
close();
//qDebug() << "Unable to start server" << server.errorString();

}
QString ipAddress=(server->serverAddress()).toString();
qDebug () << "Server started at " << ipAddress ;//go to log

}

void MainWindow::setPlotWindow(dynamicPlots* dp)
{
qDebug() << "Setting up Plot Window";
dPlot = dp;
}@