Get USB connection response slowly when using Link-OS SDK

Issue / Question

Customer use Link-OS SDK demo to printing and encoding via USB driver connection.

When using “ZebraPrinter printer = ZebraPrinterFactory.getInstance(printerConnection);”  to get USB connection from driver, it will response after past over than 30 seconds.

Applicable To

Link-OS SDK, Java and C# PC application develop

Resolution / Answer

A workaround way that use “com.zebra.sdk.comm.DriverPrinterConnection” to create connection instead of “ZebraPrinterFactory.getInstance”.

The sample as below.

private void sendAndWaitDate() {
        Connection conn = null;
        try {
            conn = new DriverPrinterConnection("ZDesigner ZD500R-300dpi ZPL");
            conn.open();
            byte[] zpl = "^XA^FN1^RFR,H,0,12,2^FS^FH_^HV1,256^FS^RFW,H,1,14,1^FD3000313233343536373839414243^FS^XZ".getBytes();
            byte[] tid = null;
            tid = conn.sendAndWaitForResponse(zpl, 500, 500, null);
            DemoDialog.showErrorDialog(SendFileDemo.this, tid.toString(), tid.toString());
        } catch (ConnectionException e) {
            DemoDialog.showErrorDialog(SendFileDemo.this, e.getMessage(), "Connection Error!");
        } finally {
            try {
                if (conn != null)
                    conn.close();
            } catch (ConnectionException e) {
            }
        }
    }