Initial HyperX Eve 1800 SignalRGB plugin and protocol tools

Working 10-zone plugin using the 0x44 live colour reports on the 0xFF90
vendor interface (data then commit). Includes Python tools used to
identify the device, confirm the protocol and map zones. Output is
dimmer than onboard effects; investigation pending.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EcbUcbNpyPn7cGpe4t6y5y

tools/brightness_ab.py

@@ -0,0 +1,55 @@
+"""A/B test: does sending frames faster make the Eve 1800 dimmer?
+
+Run with SignalRGB fully closed. Each step shows full white for a few seconds
+at a different update rate; press Enter to move on and type how bright it
+looked (1 = barely lit, 5 = full brightness). Results go to brightness_ab.json.
+"""
+import json
+import pathlib
+import time
+
+import eve
+
+OUT = pathlib.Path(__file__).with_name("brightness_ab.json")
+WHITE = [(255, 255, 255)] * 10
+STEPS = [
+    ("single frame, then nothing", 0),
+    ("2 frames/sec (static-effect keep-alive)", 2),
+    ("10 frames/sec", 10),
+    ("33 frames/sec (SignalRGB animated effect)", 33),
+]
+
+
+def run_step(fps, seconds=6):
+    packets = eve.build_packets(WHITE)
+    dev = eve.open_device()
+    dev.set_nonblocking(True)
+    try:
+        end = time.monotonic() + seconds
+        while True:
+            for p in packets:
+                dev.write(p)
+            while dev.read(eve.REPORT_LEN):
+                pass
+            if not fps or time.monotonic() >= end:
+                break
+            time.sleep(1 / fps)
+        if not fps:
+            time.sleep(seconds)
+    finally:
+        dev.close()
+
+
+def main():
+    results = {}
+    for label, fps in STEPS:
+        input(f"\nNext: {label}. Watch the keyboard and press Enter...")
+        print("  showing white for 6 seconds...")
+        run_step(fps)
+        results[label] = input("  How bright was it, 1-5 (add notes if you like)? ").strip()
+        OUT.write_text(json.dumps(results, indent=2))
+    print(f"\nSaved to {OUT}")
+
+
+if __name__ == "__main__":
+    main()