Does anyone have experience with printing custom labels (Acumatica reports) to device hub? 

Hi Robert,

What version of Acumatica are you building this on? I looked at current print job code in 2021 R1 and it calls a slightly different combination of functions, AssignPrintJobToPrinter and CreatePrintJobGroups. I haven’t seen a single place where CreatePrintJob is currently used in PX.Objects.

                Dictionary<string, string> parameters = new Dictionary<string, string>();
                string actualReportID = null;

                PXReportRequiredException ex = null;
                Dictionary<PX.SM.PrintSettings, PXReportRequiredException> reportsToPrint = new Dictionary<PX.SM.PrintSettings, PXReportRequiredException>();

                foreach (FSContractSchedule schedule in list)
                {
                    parameters = new Dictionary<string, string>();
                    parameters["FSServiceContract.RefNbr"] = CurrentServiceContract.Current?.RefNbr;
                    parameters["FSSchedule.RefNbr"] = schedule.RefNbr;

                    object customer = PXSelectorAttribute.Select<FSContractSchedule.customerID>(ContractScheduleSelected.Cache, schedule);
                    actualReportID = new NotificationUtility(this).SearchReport(SO.SONotificationSource.Customer, customer, reportID, schedule.BranchID);
                    ex = PXReportRequiredException.CombineReport(ex, actualReportID, parameters);

                    reportsToPrint = PX.SM.SMPrintJobMaint.AssignPrintJobToPrinter(reportsToPrint, parameters, adapter, new NotificationUtility(this).SearchPrinter, SO.SONotificationSource.Customer, reportID, actualReportID, schedule.BranchID);
                }

                if (ex != null)
                {
                    PX.SM.SMPrintJobMaint.CreatePrintJobGroups(reportsToPrint);

                    throw ex;
                }

I would try to do it this way (you can ignore the CombineReport portion since you’re only printing one document).

Something else that you should check is the type of printer that you are sending this to - DeviceHub supports raw mode (used to send ZPL code directly to a label printer), and traditional GDI printing (to send a PDF or image to the printer). I noticed that you are hardcoding this job to a label printer that’s set for raw mode in DeviceHub, it will certainly not be able to handle a standard Acumatica report. Note that it is possible to generate ZPL code on the fly, it is definitely the fastest way to print labels to a label printer.