Arctis 7+: persist settings with the save command - #583
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Matches what steelseries_arctis_nova_3p_wireless.hpp already does - same 00 09, same helper shape, same call pattern. Builds clean, tests pass.
One thing: put your note about every set writing flash into the header comment, not just the PR. Anyone calling these on a timer needs to see it in the file.
The untested 7+ PIDs are fine by me, same generation.
Every setter now sends the save command, so each set writes to flash. That matters to anyone driving these from a timer, and the file is where they will look.
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On the Arctis 7+ family, sidetone, inactive time and equalizer changes were lost whenever the headset was power-cycled, because the driver never sent a save. This adds a saveStateArctis7Plus() helper that sends 00 09 (the same save opcode and pattern steelseries_arctis_nova_3p_wireless.hpp already uses) - called in each of the four setters.
Tested on an Arctis 7X+ (1038:2216): sidetone, EQ preset, custom EQ and inactive time all survive a power-cycle with this change. The other 7+ product IDs (220e, 2212, 2236) are untested, but they are the same hardware generation so I suspect the fix is identical / works on all. Each set now writes to flash (which may matter to anyone calling these from a timer, as I was doing previously). There already appears to be precedent in the code that save-after-set is an approved idiom, however.