Hi @nicolai I have a complete solution pasted below.
This code snippet is Arduino code, and does:
- Setup UI views for debug console and clock text label
- Setup a refresh timer for the clock text label
- Initialize wifi (insert your own access point data)
- In
wifiReady the HTTP request is initialized, insert your own API Key in the URL
- In
dataReady the http response is parsed with e regular expression
- Convert the unix timestamp to a Lib C broken down time
- Convert the time to mono's
DateTime object
- Set the systems datetime
#include <mono.h>
mono::io::Wifi *wifi = 0;
mono::network::HttpClient *client = 0;
mono::ui::ConsoleView<176,110> *console;
mono::ui::TextLabelView *clockLbl;
mono::Timer *tim;
void setup() {
// init console view
console = new mono::ui::ConsoleView<176,110>();
console->show();
// init clock label
clockLbl = new mono::ui::TextLabelView(mono::geo::Rect(10,120,156,45), "-");
clockLbl->setAlignment(mono::ui::TextLabelView::ALIGN_CENTER);
clockLbl->show();
tim = new mono::Timer(999);
tim->setCallback(&updateClock);
updateClock();
tim->start();
// start wifi
wifi = new mono::io::Wifi("YOUR_SSID_HERE", "YOUR_PASSPHRASE_HERE");
wifi->setConnectedCallback(&wifiReady);
console->WriteLine("Connecting wifi...");
wifi->connect();
}
void updateClock() {
// repaint the clock label
clockLbl->setText(mono::String::Format("%s\n%s", mono::DateTime::now().toTimeString()(), DateTime::now().toDateString()()));
}
void wifiReady() {
if (client == 0) {
delete client;
}
// fetch the time stamp from the HTTP API
console->WriteLine("http fetch...");
client = new mono::network::HttpClient("http://api.timezonedb.com/v2/get-time-zone?key=YOUR_API_KEY_HERE&format=json&zone=CEST&by=zone&fields=timestamp");
client->setDataReadyCallback(&dataReady);
}
void dataReady(const mono::network::HttpClient::HttpResponseData &data) {
// debug print the received data
console->WriteLine(mono::String::Format("--> %s",data.bodyChunk()));
// use a regular expression to extract the timestamp from the JSON
mono::Regex timeReg("\"timestamp\":([0-9]+)");
mono::Regex::Capture caps[1];
// see if there is a match
if (timeReg.Match(data.bodyChunk, caps, 1)) {
//extract the timestamp as a string
mono::String timeStr = timeReg.Value(caps[0]);
// convert the string to a Lib C time_t
time_t utime;
sscanf(timeStr(), "%li", &utime);
console->WriteLine(mono::String::Format("Parsed %li", utime));
// convert to a Lib C brokendown time structure
struct tm *broken = localtime(&utime);
// create a mono DateTime object from the brokendown time
mono::DateTime time(broken, true);
console->WriteLine(time.toString());
// set the system clock from the DateTime
mono::DateTime::setSystemDateTime(time);
clockLbl->setText(mono::display::GreenColor);
}
}
void loop() {
// Leave this empty
}
