The connectPrinter method of BLEPrinter does not throw any error when it fails to connect to the printer

[akmalhisyammm]

Hi, I have a problem with the connectPrinter method in BLEPrinter. When it fails to connect to the printer, it does not throw any error, so the application crashes while printing the receipt. I think this problem is quite crucial in the receipt printing process. Is there any alternative way to solve this problem?

[felixoakz]

Did anyone find a workaround for this?

I even did, using some then/catch, but it just stopped working when updated to android SDK to 34.

Basically printer works fine, but then app crashes if printer is turned off. With no way to catch error nor displaying unreachable BLE printer message to user whatsoever.

any help would be appreciated!
thanks in advance and have a great day you'all :)

[francesco-clementi-92]

Can you show the code you are using to print?

[felixoakz]

Sure:

        try {
            if (isPrinting) return "Printing...";
            setIsPrinting(true);

            await BLEPrinter.closeConn();
            await BLEPrinter.connectPrinter(foundSettings.default_printer.inner_mac_address);
            BLEPrinter.printText(text);

            return "Text printed."
        } catch (err) {
            return "Printer disconnected, verify connection."
        } finally {
            setIsPrinting(false);
        }

This code prints ok, but wont fall to the catch exception (or any other) if printer is off. Tried some variations of this, with no success.

Thanks in advance for the help @francesco-clementi-92

[thiendangit]

To work around you can use a timeout to check you connect, if more than 3s (or any seconds) then return "disconnect" @francesco-clementi-92 @felixoakz