var ziti = require('ziti-sdk-nodejs');

const ziti_init = async (identity) => {
    return new Promise((resolve) => {
        ziti.ziti_init(identity, () => {
            resolve();
        });
    });
};

const ziti_service_available = (service) => {
    return new Promise((resolve) => {
        ziti.ziti_service_available(service, (status) => {
            resolve(status);
        });
    });
};

function ziti_dial(service) {
    return new Promise((resolve, reject) => {
        ziti.ziti_dial(
            service,
            (conn) => {
                resolve(conn);
            },
            (data) => {
                // Do something with data...
            },
        );
    });
}

const ziti_write = (conn, data) => {
    return new Promise((resolve) => {
        ziti.ziti_write(conn, data, () => {
            resolve();
        });
    });
};

(async () => {

    await ziti_init(LOCATION_OF_IDENTITY_FILE);

    let status = await ziti_service_available(YOUR_SERVICE_NAME);

    if (status === 0) {

        const conn = await ziti_dial(YOUR_SERVICE_NAME);

        let data = SOME_KIND_OF_DATA;

        let buffer = Buffer.from(data);

        await ziti_write(conn, buffer);

        ...etc
    }

})();