Classic implementation of the basic method of intelligent home of Internet of things

      Today I would like to talk with you , The realization of Smart Home Internet of things , Mainly used today Qt Develop an IOT application for smart home . You can use cloud services to remotely control and communicate with devices . This article will realize the remote lighting development board LED As an example .​

      In the life , We can use WIFI Smart socket , To remotely control household appliances . for example , Turn on the water heater remotely , Turn on the air conditioner remotely , Curtains, etc . In fact, the principle of these devices is to WIFI The socket is registered on the ECS , And then through the cell phone APP Visit and ask about cloud services , To control WIFI Socket .

First of all ： Introduction to basic hardware

    Need one ESP8266 Serial port to WIFI Module and need to add a USB-TTL modular .USB The cable can be connected to the computer , Use serial port to debug this module .

      Be careful ： If you use other wifi modular , You need to brush the firmware to access the cloud to access the server .

     

second ： test WIFI Module function   

    To realize the function of the Internet of things , Need to use ESP8266 WIFI modular . Test first WIFI Whether the module can be used normally ,  Whether the server can be connected normally .

      Design the device in the cloud first , Take your name and equipment number .    

      Use WIFI The baud rate of module serial port communication is 115200, stay Ubuntu Set up WIFI When the module , The general serial port name is “ttyUSB0”, The default is No Access to this /dev/ttyUSB0 The equipment . So we need to use the following instructions to modify permissions .

sudo chmod 777 /dev/ttyUSB0

Third ： The specific method of code implementation

#include "esp8266.h"#include <unistd.h>#include <QDebug>Esp82266::Esp82266(QWidget *parent){
    Q_UNUSED(parent) /*  Serial object , Used with  Esp8266  Module communication  */ serialPort = new QSerialPort(this);​ /*  Timer Objects , It is used to send heartbeat packets of the device online at a fixed time  */ timer = new QTimer();​ /* led  object , It is used to receive data from the cloud through the serial port , Then control the board  LED */ led = new Led(this);​ /*  Set serial port name  */#if __arm__ serialPort->setPortName("ttymxc2");#elseserialPort->setPortName("ttyUSB0");#endif​/*  set baud rate  */ serialPort->setBaudRate(115200);​/*  Set the number of data bits  */ serialPort->setDataBits(QSerialPort::Data8);​/*  Set parity  */ serialPort->setParity(QSerialPort::NoParity);​ /*  Set stop bit  */ serialPort->setStopBits(QSerialPort::OneStop);​ /*  set flow control  */ serialPort->setFlowControl(QSerialPort::NoFlowControl);​ if (!serialPort->open(QIODevice::ReadWrite)) qDebug()<<" The serial port cannot be opened ！ May be in use ！"<<endl; else {
    qDebug()<<" Serial port opened successfully ！"<<endl; }​ /*  Start connecting to the cloud  */ connectToClound();​ connect(serialPort, SIGNAL(readyRead()), this, SLOT(serialPortReadyRead()));​ connect(timer, SIGNAL(timeout()), this, SLOT(onTimerTimeOut()));}​ void Esp82266::serialPortReadyRead() {
    /*  Read data from receive buffer  */ QByteArray buf = serialPort->readAll();​ QString temp = QString(buf); readData.append(temp); qDebug()<<temp<<endl;​ if (readData.contains("ready")) {
    /*  If reset succeeds  */ sendCmdToEsp8266("AT+CWMODE=1"); readData.clear();}​ if (readData.contains("OK") && readData.contains("AT+CWMODE")) {
    qDebug()<<" Set up  STA  Mode success "<<endl; sendCmdToEsp8266("AT+CWJAP=\"ALIENTEK-YF\",\"15902020353\""); qDebug()<<" Start connecting  WIFI"<<endl; readData.clear(); }​ if (temp.contains("WIFI GOT IP")) {
    qDebug()<<" Connect  WIFI  success "<<endl;sleep(2);/*  The device number and password of the atomic cloud  */ sendCmdToEsp8266("AT+ATKCLDSTA=\"02314701717851074890\",\"12345678\""); qDebug()<<" Please wait for the cloud connection "<<endl; }​ if (temp.contains("CLOUD CONNECTED")) {
    qDebug()<<" Successfully connected to the cloud "<<endl; sleep(2); /* 15s  Just send a heartbeat packet  */ timer->start(15000);}​ if (temp == " open ") led->setLedState(true); else if (temp == " Turn off ") led->setLedState(false);​}​ Esp82266::~Esp82266(){
    serialPort->close(); delete timer; timer = nullptr;}​ void Esp82266::sendCmdToEsp8266(QString cmd){
    cmd = cmd + "\r\n";​ QByteArray data = cmd.toUtf8(); serialPort->write(data);}​void Esp82266::connectToClound(){
    /*  Restart the module , Note that if the atomic cloud is already connected , *  It needs to be powered on again or short circuited  RST  Feet to reset the module  */ sendCmdToEsp8266("AT+RST"); }​ void Esp82266::sleep(int second) {
    usleep(second * 1000000); }​void Esp82266::sendTextMessage(QString message) {
    serialPort->write(message.toLatin1());}​void Esp82266::onTimerTimeOut(){
     sendTextMessage("online");  qDebug()<<" Send device online heartbeat packets "<<endl;}

      analysis ： Add router's WiFi Hotspot and password , And the device number and password of the cloud

​ Fourth ： Cloud API Interface and implementation

      When communicating with the cloud , You must be familiar with cloud API Interface . The common cloud on the network API Communication flow chart ​.

    Writing QT When the application is implemented , The focus should be on HTTP And WEBSocket In the direction of ​. Some account information and device information are through HTTPS Obtained by the protocol interface , communication WebSocket Protocol interfaces ​.

#include "webapi.h"#include <QUuid>#include <QRegularExpression>Webapi::Webapi(QObject *parent){
    this->setParent(parent); /*  Empty array  */ groupID.clear(); deviceID.clear(); deviceNumber.clear();​ timer = new QTimer(); connect(timer, SIGNAL(timeout()), this, SLOT(onTimerTimeOut()));​ networkAccessManager = new QNetworkAccessManager(this);​ orgURL = "https://cloud.alientek.com/api/orgs"; /*  Please fill in your own  token  Information ！！！ */ api_token = "bf591984c8fa417584d18f6328e0ef73";/*  Get the list of account institutions  */ getOrgURL();​ QUuid uuid = QUuid::createUuid(); random_token = uuid.toString();​ webSocket = new QWebSocket();/*  You need to add some security configuration to access  https */ QSslConfiguration config; config.setPeerVerifyMode(QSslSocket::VerifyNone); config.setProtocol(QSsl::TlsV1SslV3); webSocket->setSslConfiguration(config);​ connect(webSocket, SIGNAL(connected()), this, SLOT(webSocketConnected())); connect(webSocket, SIGNAL(binaryMessageReceived(QByteArray)), this, SLOT(onBinaryMessageReceived(QByteArray))); }​ Webapi::~Webapi() {
    delete timer; delete webSocket; webSocket = nullptr; }​ void Webapi::getOrgURL() {
    getDataFromWeb(QUrl(orgURL));}​ /*  Get the device grouping list  */ void Webapi::getGroupListUrl(){
    getDataFromWeb(QUrl(groupListUrl));}​ /*  Get information about the device  */ void Webapi::getDevOfGroupUrl() {
    getDataFromWeb(QUrl(devOfGroupUrl)); }​/*  Get device connection status  */ void Webapi::getConStateUrl(){
    getDataFromWeb(QUrl(conStateUrl));}​ /*  Get data from ECS  */ void Webapi::getDataFromWeb(QUrl url) {
    /*  Network request  */ QNetworkRequest networkRequest;​ /*  You need to add some security configuration to access  https */ QSslConfiguration config;config.setPeerVerifyMode(QSslSocket::VerifyNone);config.setProtocol(QSsl::TlsV1SslV3); networkRequest.setSslConfiguration(config);​​ /*  Set the access address  */ networkRequest.setUrl(url);​ /*  Network response  */ networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json;charset=UTF-8");​ /*  Parameter 2 is the... Of the atomic cloud account  token  Information , Fill in your own  */ networkRequest.setRawHeader("token", api_token.toLatin1()); QNetworkReply *newReply = networkAccessManager->get(networkRequest);​ connect(newReply, SIGNAL(finished()), this, SLOT(replyFinished())); connect(newReply, SIGNAL(readyRead()), this, SLOT(readyReadData()));}

The project code can refer to the following connection ​：

https://download.csdn.net/download/weixin_41114301/85875381

01_smarthome Under the project ：

1、 webapi The folder is the application of cloud platform , It is mainly used to communicate with atomic cloud .

2、Headers Folder is the header file of interface design . 

3、Sources Folder is the source file of interface design . esp8266 Under the project ：

4、led The folder is I.MX6U Development board control LED The interface program of . 

5、Headers The folder is esp8266 Header file of communication . 

6、Sources The folder is esp8266 Source file of communication （ Use serial port communication ）.

The fifth ​： Running results