Updates

video_cycler.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+"""
+video_cycler.py — Toggle /video start/stop on the device every CYCLE_S seconds.
+
+Pairs with sn65_monitor.py: this script provokes the flicker by cycling the
+static-pink video stream, while sn65_monitor measures.  Press Ctrl+C to stop.
+"""
+
+import signal
+import sys
+import time
+from datetime import datetime
+
+import requests
+
+DEVICE_BASE = "http://192.168.45.8:5000"
+VIDEO_URL   = f"{DEVICE_BASE}/video"
+CYCLE_S     = 10.0
+HTTP_TIMEOUT_S = 3.0
+
+
+def video_start() -> None:
+    try:
+        requests.put(VIDEO_URL,
+                     json={"action": "start", "mode": "static-pink"},
+                     timeout=HTTP_TIMEOUT_S)
+    except requests.exceptions.RequestException as e:
+        print(f"  video START failed: {e}")
+
+
+def video_stop() -> None:
+    try:
+        requests.put(VIDEO_URL, json={"action": "stop"},
+                     timeout=HTTP_TIMEOUT_S)
+    except requests.exceptions.RequestException as e:
+        print(f"  video STOP failed: {e}")
+
+
+def main() -> None:
+    # On Ctrl+C, make sure we leave video stopped.
+    def _shutdown(*_):
+        print("\nshutting down — video off")
+        video_stop()
+        sys.exit(0)
+    signal.signal(signal.SIGINT,  _shutdown)
+    signal.signal(signal.SIGTERM, _shutdown)
+
+    print(f"VIDEO CYCLER — {CYCLE_S:.0f} s on / 0.5 s off (Ctrl+C to stop)\n")
+    cycle = 0
+    while True:
+        cycle += 1
+        ts = datetime.now().strftime("%H:%M:%S")
+        print(f"[{ts}] cycle {cycle:04d}  video ON", flush=True)
+        video_start()
+        time.sleep(CYCLE_S)
+        video_stop()
+        time.sleep(0.5)
+
+
+if __name__ == "__main__":
+    main()