Basic Implementation of Radio Server/Client

Client written in QT and communicates to SDR server over TCP sockets.

Currently getting and setting frequencies is supported

.gitignore

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+# This file is used to ignore files which are generated
+# ----------------------------------------------------------------------------
+
+*~
+*.autosave
+*.a
+*.core
+*.moc
+*.o
+*.obj
+*.orig
+*.rej
+*.so
+*.so.*
+*_pch.h.cpp
+*_resource.rc
+*.qm
+.#*
+*.*#
+core
+!core/
+tags
+.DS_Store
+.directory
+*.debug
+Makefile*
+*.prl
+*.app
+moc_*.cpp
+ui_*.h
+qrc_*.cpp
+Thumbs.db
+*.res
+*.rc
+/.qmake.cache
+/.qmake.stash
+
+# qtcreator generated files
+*.pro.user*
+
+# xemacs temporary files
+*.flc
+
+# Vim temporary files
+.*.swp
+
+# Visual Studio generated files
+*.ib_pdb_index
+*.idb
+*.ilk
+*.pdb
+*.sln
+*.suo
+*.vcproj
+*vcproj.*.*.user
+*.ncb
+*.sdf
+*.opensdf
+*.vcxproj
+*vcxproj.*
+
+# MinGW generated files
+*.Debug
+*.Release
+
+# Python byte code
+*.pyc
+
+# Binaries
+# --------
+*.dll
+*.exe
+

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+
+project(RadioTuner LANGUAGES CXX)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt5 COMPONENTS Core Quick REQUIRED)
+
+add_executable(${PROJECT_NAME} "main.cpp" "qml.qrc"  "client.cpp")
+target_compile_definitions(${PROJECT_NAME} PRIVATE $<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:QT_QML_DEBUG>)
+target_link_libraries(${PROJECT_NAME} PRIVATE Qt5::Core Qt5::Quick)

client.cpp

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+#include "client.h"
+#include <QString>
+#include <QTcpSocket>
+#include <iostream>
+
+
+Client::Client(QObject *parent) : QObject(parent) {
+    socket = new QTcpSocket(nullptr);
+    socket->connectToHost("localhost", 65432);
+    socket->waitForConnected();
+    std::cout << "Connected" << std::endl;
+}
+
+Client::~Client() {
+     socket->close();
+}
+
+void Client::send(QString data) {
+    std::cout << "SENDING MESSAGE: \"" << data.toStdString() << "\"" << std::endl;
+    QByteArray dataStream = data.toUtf8();
+    socket->write(dataStream);
+}
+
+QString Client::recv(void) {
+    socket->waitForReadyRead(1000);
+    QByteArray data = socket->readAll();
+    QString msg = QString(data);
+    std::cout << "RECEIVED MESSAGE SO FAR: \"" << msg.toStdString() << "\"" << std::endl;
+    return msg;
+}
+
+void Client::setFrequency(double freq) {
+    QString msg = QString(":FREQ=");
+    msg.push_back(QString::number(freq));
+    msg.push_back(";");
+    this->send(msg);
+}
+
+double Client::getFrequency(void) {
+    this->send(QString("?FREQ;"));
+    return this->recv().toDouble();
+}

client.h

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+#ifndef CLIENT_H
+#define CLIENT_H
+
+#include <QObject>
+#include <QTcpSocket>
+
+class Client : public QObject {
+    Q_OBJECT
+public:
+    explicit Client(QObject *parent = nullptr);
+    ~Client();
+    void send(QString data);
+    QString recv(void);
+    Q_INVOKABLE void setFrequency(double freq);
+    Q_INVOKABLE double getFrequency(void);
+private:
+    QTcpSocket *socket = nullptr;
+};
+
+#endif // CLIENT_H

main.cpp

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+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <QQmlContext>
+
+#include "client.h"
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+
+    QGuiApplication app(argc, argv);
+
+//    qmlRegisterType<Client>("io.qt.client", 1, 0, "Client");
+
+    QQmlApplicationEngine engine;
+    const QUrl url(QStringLiteral("qrc:/main.qml"));
+    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
+                     &app, [url](QObject *obj, const QUrl &objUrl) {
+        if (!obj && url == objUrl)
+            QCoreApplication::exit(-1);
+    }, Qt::QueuedConnection);
+    Client *client = new Client();
+    engine.rootContext()->setContextProperty("client", client);
+    engine.load(url);
+
+    return app.exec();
+}

main.qml

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+import QtQuick 2.12
+import QtQuick.Window 2.12
+import QtQuick.Controls 2.3
+
+Window {
+    visible: true
+    width: 640
+    height: 480
+    property alias freqText: freqText
+    property alias dial: dial
+    title: qsTr("Radio Tuner")
+    property var initialFreq : {
+        return client.getFrequency() / 100000;
+    }
+
+    Dial {
+        id: dial
+        x: 74
+        y: 248
+        font.pointSize: 10
+        stepSize: 1
+        to: 1080
+        from: 875
+        value: initialFreq
+    }
+
+    Text {
+        id: title
+        x: 38
+        y: 37
+        text: qsTr("Radio Tuner")
+        font.pixelSize: 32
+    }
+
+    Text {
+        id: freqText
+        x: 108
+        y: 197
+        text: {
+            var dialNumber = initialFreq / 10;
+            var dialString = (dialNumber < 100) ? dialNumber.toString().substring(0, 4) : dialNumber.toString().substring(0, 5)
+            return "Tuned To: " + dialString
+        }
+
+        font.pixelSize: 24
+    }
+    Connections {
+        target: dial
+        onMoved: {
+            var dialNumber = (dial.value / 10)
+            var dialString = (dialNumber < 100) ? dialNumber.toString().substring(0, 4) : dialNumber.toString().substring(0, 5)
+            freqText.text = qsTr("Tuned To: " + dialString)
+            dialNumber = parseFloat(dialString)
+            console.log("The radio then dials to: " + dialNumber + "MHz")
+            client.setFrequency((dialNumber * 1000000))
+
+        }
+    }
+}

qml.qrc

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+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+    </qresource>
+</RCC>

tuner.py

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+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+##################################################
+# GNU Radio Python Flow Graph
+# Title: Top Block
+# Generated: Sun May 12 22:10:45 2019
+##################################################
+
+
+from gnuradio import analog
+from gnuradio import audio
+from gnuradio import blocks
+from gnuradio import eng_notation
+from gnuradio import filter
+from gnuradio import gr
+from gnuradio.eng_option import eng_option
+from gnuradio.filter import firdes
+from optparse import OptionParser
+import osmosdr
+import time
+import socket
+import re
+
+class top_block(gr.top_block):
+
+    def __init__(self):
+        gr.top_block.__init__(self, "Top Block")
+
+        ##################################################
+        # Variables
+        ##################################################
+        self.samp_rate = samp_rate = 1536000
+        self.frequency = frequency = 96900000
+
+        ##################################################
+        # Blocks
+        ##################################################
+        self.rtlsdr_source_0 = osmosdr.source( args="numchan=" + str(1) + " " + '' )
+        self.rtlsdr_source_0.set_sample_rate(samp_rate)
+        self.rtlsdr_source_0.set_center_freq(frequency, 0)
+        self.rtlsdr_source_0.set_freq_corr(0, 0)
+        self.rtlsdr_source_0.set_dc_offset_mode(2, 0)
+        self.rtlsdr_source_0.set_iq_balance_mode(2, 0)
+        self.rtlsdr_source_0.set_gain_mode(True, 0)
+        self.rtlsdr_source_0.set_gain(0, 0)
+        self.rtlsdr_source_0.set_if_gain(0, 0)
+        self.rtlsdr_source_0.set_bb_gain(0, 0)
+        self.rtlsdr_source_0.set_antenna('', 0)
+        self.rtlsdr_source_0.set_bandwidth(0, 0)
+
+        self.low_pass_filter_0 = filter.fir_filter_ccf(4, firdes.low_pass(
+        	1, samp_rate, 500000, 60000, firdes.WIN_KAISER, 6.76))
+        self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True)
+        self.audio_sink_0 = audio.sink(48000, 'pulse', True)
+        self.analog_wfm_rcv_0 = analog.wfm_rcv(
+        	quad_rate=384000,
+        	audio_decimation=8,
+        )
+
+        ##################################################
+        # Connections
+        ##################################################
+        self.connect((self.analog_wfm_rcv_0, 0), (self.audio_sink_0, 0))
+        self.connect((self.blocks_throttle_0, 0), (self.low_pass_filter_0, 0))
+        self.connect((self.low_pass_filter_0, 0), (self.analog_wfm_rcv_0, 0))
+        self.connect((self.rtlsdr_source_0, 0), (self.blocks_throttle_0, 0))
+
+    def get_samp_rate(self):
+        return self.samp_rate
+
+    def set_samp_rate(self, samp_rate):
+        self.samp_rate = samp_rate
+        self.rtlsdr_source_0.set_sample_rate(self.samp_rate)
+        self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.samp_rate, 500000, 60000, firdes.WIN_KAISER, 6.76))
+        self.blocks_throttle_0.set_sample_rate(self.samp_rate)
+
+    def get_frequency(self):
+        return self.frequency
+
+    def set_frequency(self, frequency):
+        self.frequency = frequency
+        self.rtlsdr_source_0.set_center_freq(self.frequency, 0)
+
+
+def main(top_block_cls=top_block, options=None):
+    tb = top_block_cls()
+    tb.start()
+    HOST = '127.0.0.1' # Loopback Address (Localhost)
+    PORT = 65432 # Semi-Random Port that is non-priviledged (> 1023)
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    # Avoid bind() exception: OSError: [Errno 48] Address already in use
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    s.bind((HOST, PORT))
+    quit = False
+    while not quit:
+        s.listen(1) # Number of unaccepted connections before it rejects new ones
+        conn, addr = s.accept()
+        print("Connected by ", addr)
+        while not quit:
+            data = conn.recv(1024) # Not sure about the bytes argument...
+            data = data.strip() # Removes \r\n
+            print("DATA: ", data)
+            commands = re.split(";", data)
+            if data == "":
+                break
+            for command in commands:
+                if command == "":
+                    continue
+                elif command[0] == '?':
+                    # Query Section
+                    if command[1:] == "VER":
+                        conn.sendall("Version 0.1\n")
+                    elif command[1:] == "FREQ":
+                        conn.sendall(str(tb.get_frequency()) + '\n')
+                    else:
+                        print("UNKNOWN COMMAND: ", command)
+                elif command[0] == ':':
+                    # Setter Section
+                    if command[1:5] == "FREQ":
+                        print("FREQUENCY SET")
+                        frequency = float(command[6:])
+                        if frequency >= 87500000 and frequency <= 108000000:
+                            tb.set_frequency(frequency)
+                        else:
+                            print("ERROR: Invalid Frequency ", frequency)
+                    elif command[1:] == "QUIT":
+                        print("QUITTING")
+                        quit = True
+                    else:
+                        print("UNKNOWN COMMAND: ", command)
+                else:
+                    print("UNKNOWN COMMAND", command)
+
+        conn.close()
+    s.close()
+
+
+if __name__ == '__main__':
+    main()