How can I restart canceled job? about kotlinx.coroutines HOT 2 CLOSED

fun launchSendUpdRepeat() = launch(CommonPool) {
            var nextPrintTime = System.currentTimeMillis()
            while (isActive) {
                val currentTime = System.currentTimeMillis()
                if (currentTime >= nextPrintTime) {
                    sendUDPrequest(UDP_SERVER_IP, UDP_SERVER_PORT, UDP_SERVER_MSG)
                    nextPrintTime = currentTime + 2000L
                }
            }
        }

send_udp_repeat = launchSendUdpRepeat()

commu_status.setOnClickListener {
            send_udp_repeat?.cancel()
            send_udp_repeat = null
        }
menu_button.setOnClickListener {
            send_udp_repeat = launchSendUdpRepeat()
        }