A script that watches when visa registration are open. Set up for www.herault.gouv.fr/booking but can be adapted.

visa_booking_watcher.ts

/*
* Prerequisite: 
* You will need a supported Huawei 3G dongle: 
* https://github.com/bg111/asterisk-chan-dongle/wiki/Requirements-and-Limitations
*
* You also have to install chan-dongle-extended.
* https://garronej.github.io/chan-dongle-extended-pages/
* This tool of mine enable to send SMS via a CLI.
*
* You then need to run this script on something like a raspberry pi
* with a connected 3G dongle. 
* Run it with:
*
* $ screen -S visa_watch
* $ wget https://gist.github.com/garronej/56a592a12816c44eaecb0c3cd2a657fd/raw/109ad0a04a9b22f0d90dced0b4f99917b3c4342f/visa_booking_watcher.ts
* $ sudo npm install -g node-fetch scripting-tools typescript ts-node  #Or install locally in a package.json
* $ ts-node visa_booking_watcher.ts
*
* After that you can press <Crl-a><d> you can relax you will receive a SMS when the website will be available 
* for booking. 
*
* PS: Don't forget to replace the phone number and to adapt the script when relevant.
* 
*/
import fetch from "node-fetch";
import * as st from "scripting-tools";

const url = "http://www.herault.gouv.fr/booking/create/15262";

//Who to notify when the site is available
const phoneNumbers = [
    "0636786385",
    "0685683832"
];

console.log({ url });

//Mimic a browser, it could bypass basic anti spam protection mesures.
const headers: { [key: string]: string; } = {
    "Cache-Control": "max-age=0",
    "Upgrade-Insecure-Requests": "1",
    "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
    "Accept-Language": "fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7"
};


(async function main() {


    while (true) {

        await new Promise(resolve => setTimeout(resolve, 20000));

        const fetchResp = await fetch(url, { headers })
            .catch((e: Error) => e)
            ;

        if (fetchResp instanceof Error) {
            console.warn(fetchResp.message);
            continue;
        }

        const { status } = fetchResp;

        console.log(new Date(), { status });

        if (status === 502) {
            continue;
        }

        const text = await fetchResp.text()
            .catch((e: Error) => e)
            ;

        if (text instanceof Error) {

            console.warn(text.message);

            continue;

        }

        if (text.match(/Cette page n'est pas disponible/i)) {
            console.log(new Date(), "The page did load but the site is not open for booking");
            continue;
        }

        console.log(new Date(), "The page is ready!");

        break;

    }

    for (const phoneNumber of phoneNumbers) {

        try {

            await st.exec(
                [
                    `dongle send --imei 861586002697296`,
                    `--number ${phoneNumber}  --text "Wake up! ${url} is up"`
                ].join(" ")
            );

            console.log(`SMS sent to ${phoneNumber}`);

        } catch (error) {
            console.warn(new Date(), error.message);
        }

    }

    await new Promise(resolve => setTimeout(resolve, 240000));

    main();

})();