Bluetooth sending files

Hi there,

I creating a app, where I want to print a pdf with a pos/esc printer.
With windows it works as expected, so I tried to use the “Bluetooth Client”.
Here I’m able to send text or bytes.
But if I read the file as string and send it to the printer, the normal file text will be printed, not the file itself.
How to send the file as file itself?

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