receipt-print-hq/escpos-tools

Command "GS ( J" is not understood

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Noted in #20 as a warning.

Cannot find this command mentioned in any programming guide, probably need to guess its length and discard it.

Relevant hexdump showing three usages of the command (Hex code 1d 28 4a)-

00000000  1b 3d 01 1d 28 4a 02 00  01 00 1d 28 4a 02 00 02  |.=..(J.....(J...|
00000010  00 1d 28 4a 02 00 03 00  1b 63 30 02 1b 63 31 02  |..(J.....c0..c1.|