hoehermann · October 17, 2025 22:40 · Oct 17, 2025
diff --git a/cyberJack.py b/cyberJack.py
@@ -0,0 +1,38 @@
+# ChatGPT wrote this
+
+import usb.core
+import usb.util
+import argparse
+
+class CyberJack:
+    def __init__(self):
+        self.dev = usb.core.find(idVendor=0x0c4b, idProduct=0x0501)
+        if self.dev is None:
+            raise ValueError("REINER SCT cyberJack comfort not found")
+        cfg = self.dev.get_active_configuration()
+        intf = usb.util.find_descriptor(cfg, bInterfaceNumber=0)
+        if self.dev.is_kernel_driver_active(intf.bInterfaceNumber):
+            raise RuntimeError("Device is bound to a Kernel driver.")
+        usb.util.claim_interface(self.dev, intf.bInterfaceNumber)
+        self.ep_out = usb.util.find_descriptor(intf, bEndpointAddress=0x02)
+        self.ep_in = usb.util.find_descriptor(intf, bEndpointAddress=0x81)
+    def set_brightness(self, value: int):
+        if not 0 <= value <= 255:
+            raise ValueError("value must be in 0..255")
+        prefix = "6b07" # no idea what this is about
+        unknown1 = "00000000"
+        sequence_counter = "11" # the device's reply will contain this, but I do not check or care; is one byte and rolls over
+        unknown2 = "00000001000001" # the lowest byte could be the upper byte of the key
+        key = "3300" # the lower byte could actually be the upper byte of the value
+        value_hex = f"{value:02x}"
+        data = prefix + unknown1 + sequence_counter + unknown2 + key + value_hex
+        bytes_sent = self.dev.write(self.ep_out.bEndpointAddress, bytes.fromhex(data), timeout=100)
+        resp = self.dev.read(self.ep_in.bEndpointAddress, 20, timeout=2000)
+        return resp
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Set CyberJack brightness")
+    parser.add_argument("--brightness", type=int, required=True, help="brightness 0-255")
+    args = parser.parse_args()
+    cyberjack = CyberJack()
+    resp = cyberjack.set_brightness(args.brightness)