Add TSPL printer status reporting - #219

I'll look into this after Labour Day... First blush: I know a lot of TSPL-compatible printers don't actually support this command so I might want to make this model-specific.

Also, for the write error detection, maybe just track a bool ret variable initialized with value true and use ret &= papplDevice...(); to track the write status throughout - fewer control paths to deal with and simpler code.

Finally, since you have a genuine TSC printer, run "lprint -o verbose devices" to get the 1284 device ID you can use to create a new driver entry in "lprint-tspl.h".

Thanks Michael, that makes sense.

I ran the verbose device command against the real TSC DA210 test printer. Without elevated permissions it only found network/other printers, but with elevated permissions it returned:

usb://TSC/DA210?serial=000001
TSC DA210 (USB)
MFG:TSC;CMD:TSPL2;MDL:DA210;CLS:PRINTER;CID:TSCPrinters;

Happy to rework the patch so the TSPL status command is model-specific for the DA210 rather than applied to all TSPL-compatible printers.

Would you prefer that I resubmit the PR with those changes, or would it be better left to someone with a deeper understanding of LPrint’s driver structure?

Would you prefer that I resubmit the PR with those changes, or would it be better left to someone with a deeper understanding of LPrint’s driver structure?

You can certainly take a first pass at it - normally we add something to the driver name for capabilities like this, but if all genuine TSC label printers support the command then it could be as simple as looking for "tspl_tsc-SOMETHING" in the driver name and enabling the status command if so.