inkplate-6-arduino-library/examples/Projects/Crypto_tracker_example/Network.cpp

#include "Network.h"

#include <WiFi.h>
#include <HTTPClient.h>
#include <WiFiClientSecure.h>

#include "Inkplate.h"

//Must be installed for this example to work
#include <ArduinoJson.h>

//external parameters from our main file
extern char *ssid;
extern char *pass;
extern char *currency;

//Get our Inkplate object from main file to draw debug info on
extern Inkplate display;

//Static Json from ArduinoJson library
StaticJsonDocument<30000> doc;

void Network::begin()
{
    //Initiating wifi, like in BasicHttpClient example
    WiFi.mode(WIFI_STA);
    WiFi.begin(ssid, pass);

    int cnt = 0;
    Serial.print(F("Waiting for WiFi to connect..."));
    while ((WiFi.status() != WL_CONNECTED))
    {
        Serial.print(F("."));
        delay(1000);
        ++cnt;

        if (cnt == 20)
        {
            Serial.println("Can't connect to WIFI, restarting");
            delay(100);
            ESP.restart();
        }
    }
    Serial.println(F(" connected"));

    //Find internet time
    setTime();
}

//Gets time from ntp server
void Network::getTime(char *timeStr)
{
    //Get seconds since 1.1.1970.
    time_t nowSecs = time(nullptr);

    //Used to store time
    struct tm timeinfo;
    gmtime_r(&nowSecs, &timeinfo);

    //Copies time string into timeStr
    strncpy(timeStr, asctime(&timeinfo) + 4, 12);

    //Setting time string timezone
    int hr = 10 * timeStr[7] + timeStr[8] + timeZone;

    //Better defined modulo, in case timezone makes hours to go below 0
    hr = (hr % 24 + 24) % 24;

    //Adding time to '0' char makes it into whatever time char, for both digits
    timeStr[7] = hr / 10 + '0';
    timeStr[8] = hr % 10 + '0';
}

bool Network::getData(double *data)
{
    bool f = 0;

    // If not connected to wifi reconnect wifi
    if (WiFi.status() != WL_CONNECTED)
    {
        WiFi.reconnect();

        delay(5000);

        int cnt = 0;
        Serial.println(F("Waiting for WiFi to reconnect..."));
        while ((WiFi.status() != WL_CONNECTED))
        {
            // Prints a dot every second that wifi isn't connected
            Serial.print(F("."));
            delay(1000);
            ++cnt;

            if (cnt == 7)
            {
                Serial.println("Can't connect to WIFI, restart initiated.");
                delay(100);
                ESP.restart();
            }
        }
    }

    //Wake up if sleeping and save inital state
    bool sleep = WiFi.getSleep();
    WiFi.setSleep(false);

    //Http object used to make get request
    HTTPClient http;

    http.getStream().setTimeout(10);
    http.getStream().flush();

    //Initiate http
    char temp[128];
    sprintf(temp, "https://api.coingecko.com/api/v3/coins/%s/market_chart?vs_currency=usd&days=92", currency);

    http.begin(temp);

    //Actually do request
    int httpCode = http.GET();
    if (httpCode == 200)
    {
        while (http.getStream().available() && http.getStream().peek() != '{')
            (void)http.getStream().read();

        //Try parsing JSON object
        DeserializationError error = deserializeJson(doc, http.getStream());

        if (error)
        {
            Serial.print(F("deserializeJson() failed: "));
            Serial.println(error.c_str());
            f = 1;
        }
        else if (doc["prices"].size() > 31)
        {
            //Set all data got from internet using formatTemp and formatWind defined above
            //This part relies heavily on ArduinoJson library

            Serial.println("Success");

            //Save our data to data pointer from main file
            for (int i = 0; i < 31; ++i)
            {
                data[i] = doc["prices"][92 - 31 + i][1].as<double>();
                //Serial.println(data[i]);
            }
            f = 0;
        }
    }
    else if (httpCode == 404)
    {
        //Coin id not found
        display.clearDisplay();
        display.setCursor(50, 230);
        display.setTextSize(2);
        display.println(F("Your entered coin does not exist!"));
        display.display();
        while (1)
            ;
    }
    else
    {
        f = 1;
    }

    //Clear document and end http
    doc.clear();
    http.end();

    //Return to initial state
    WiFi.setSleep(sleep);

    return !f;
}

//Function for initial time setting ovet the ntp server
void Network::setTime()
{
    //Used for setting correct time
    configTime(0, 0, "pool.ntp.org", "time.nist.gov");

    Serial.print(F("Waiting for NTP time sync: "));
    time_t nowSecs = time(nullptr);
    while (nowSecs < 8 * 3600 * 2)
    {
        delay(500);
        Serial.print(F("."));
        yield();
        nowSecs = time(nullptr);
    }

    Serial.println();

    //Used to store time info
    struct tm timeinfo;
    gmtime_r(&nowSecs, &timeinfo);

    Serial.print(F("Current time: "));
    Serial.print(asctime(&timeinfo));
}