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@mikespook

mikespook/NTP.ino

Last active Mar 28, 2020
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Sync ESP8266 board date/time with NTP
#include <time.h>
#include <TZ.h>
#include <ESP8266WiFi.h>
#include <StackThunk.h>
#include <WiFiClientSecure.h>
#include <ESP8266HTTPClient.h>
WiFiClientSecure client;
static const char digicert[] = "-----BEGIN CERTIFICATE-----\n"
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"-----END CERTIFICATE-----";
X509List* cert;
void setup() {
Serial.begin(115200);
pinMode(LED_BUILTIN, OUTPUT);
connectWiFi("itea", "iTea0987612345");
setDateTime();
setupSecure();
}
void loop() {
getDateTime();
getURL("https://example.org");
delay(1000);
}
void blink(int t) {
for(int i = 0; i < t; i ++) {
digitalWrite(LED_BUILTIN, LOW);
delay(500);
digitalWrite(LED_BUILTIN, HIGH);
delay(200);
}
}
void getDateTime() {
time_t now = time(nullptr);
struct tm * timeinfo;
timeinfo = localtime(&now);
Serial.printf("%s %s", tzname[0], asctime(timeinfo));
}
void setDateTime() {
configTime(TZ_Pacific_Auckland, "pool.ntp.org", "time.nist.gov");
Serial.print("Waiting for NTP time sync: ");
time_t now = time(nullptr);
while (now < 8 * 3600 * 2) {
delay(500);
Serial.print(".");
blink(1);
now = time(nullptr);
}
Serial.println();
struct tm timeinfo;
gmtime_r(&now, &timeinfo);
Serial.printf("%s %s", tzname[0], asctime(&timeinfo));
}
void connectWiFi(const char* ssid, const char* password) {
Serial.printf("\nConnecting to %s", ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
blink(1);
}
Serial.print("\nWiFi connected, IP address: ");
Serial.print(WiFi.localIP().toString());
Serial.println();
}
void setupSecure() {
cert = new X509List(digicert);
client.setTrustAnchors(cert);
}
void getURL(String url) {
HTTPClient http;
if (http.begin(client, url)) {
Serial.print("[HTTP] GET ... ");
// start connection and send HTTP header
int httpCode = http.GET();
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("code: %d\n", httpCode);
// file found at server
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
String payload = http.getString();
Serial.printf("Payload: %d byte\n", payload.length());
blink(2);
}
} else {
Serial.printf("failed, error: %d %s\n", httpCode, http.errorToString(httpCode).c_str());
blink(5);
}
http.end();
} else {
Serial.printf("[HTTP} Unable to connect\n");
blink(5);
}
}
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