"ble_uart" : Unhandled promise rejection

Ok, so like this?

        uart.write(`\x03\x10(${_cmd})\n`).then(function() {
            setTimeout(function() {
                uart.disconnect();
                console.log('output:',data);
                console.log("Disconnected");
            }, 2000);
        }).catch(function () {
            console.log("Promise Rejected - disconnect");
            uart.diconnect();
        });