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DimiDR
Maybe just in general, don't use this device. It looks like it runs on Android 5 Lollipop from 2015. For the updates, it's easier to use Table/Mobile + external Printer.
Please share the code, if you made it. My thoughts: 1. Library should have a "isBusy" method, to check if the printer is printing at the moment. - don't know...
Did you try to print one line of string like "[L] Hello World"?