mqttBroker.authorizePublish = function (client, packet) {
    if (packet.topic === 'hello' && client.id === '01B4C') {
        let PACK = packet;
        setTimeout(function (packet) {
            mqttBroker.publish(PACK)
        }, 10000)
    }
}

netsh advfirewall firewall add rule name="IP Block" dir=in protocol=TCP interface=any action=block remoteip=172.30.10.120 localport=1883

netsh advfirewall firewall delete rule name="IP Block" remoteip=172.30.10.120