ERROR_WRONG_LABEL when trying to print wireless using Android Brother Sdk for label printer

Question

I have trying to print using labels from my android app which using wifi commands Brother QL-720NW label printer. Since I performed factory

Answer 1

TL;DR I solved by setting the workPath attribute:

printerInfo.workPath = context.cacheDir.Path

I noticed that the setPrinterInfo was returning false and when trying to print I received the WRONG_LABEL error code. Debugging the code I figured out that it's related to file writing permission that Brother SDK requires. The documentation is confusing and mentions about needing the WRITE_EXTERNAL_STORAGE if workPath isn't set. Even having this permission I could not make it work. I solved by setting the workPath attribute as shown above.