const zmq = require('zeromq');
const fs = require('fs');
const address = 'tcp://127.0.0.1:12345';
let i = 1;
const run = async () => {    
    const fileName = "server.json";
    let keyPair = null;
    if (fs.existsSync(fileName)) {
        keyPair = JSON.parse(fs.readFileSync("server.json"));
    } else {
        keyPair = zmq.curveKeyPair();
        fs.writeFileSync("server.json", JSON.stringify(keyPair, null, 4));    
    }
    var dealer = new zmq.Dealer({
        curveServer: true,
        curvePublicKey: keyPair.publicKey,
        curveSecretKey: keyPair.secretKey,
    });
    dealer.connect(address);
    setInterval(() => {
        let msg = [[ "weatherinfo", i ]]; // + dealer.identity
        i += 1;
        console.log('send', msg);
        dealer.send(msg);
    }, 300);
    console.log("receiving...");
    for await (const [msg] of dealer) {
        console.log("received: %s", msg.toString())
    }
}
run();