fix lỗi giải mã byte encoding

orangepi-server/visualizer.py

@@ -135,15 +135,13 @@ class RadarState:
         self.target_count = frame.get("target_count", 0)
         now = time.time()
 
-        # Belt-and-suspenders physical-limits filter.  The ESP32 side
-        # should already have gated these, but in case old firmware is
-        # still running or an ACK frame leaks through, we re-apply the
-        # same sanity rules on the Orange Pi side:
-        #   Y in front of radar (y >= 1 mm), <= 6000 mm rated range
-        #   |X| <= 6000 mm (±60° cone + safety margin)
+        # Belt-and-suspenders physical-limits filter, kept in sync with
+        # the LD2453 ESP32 parser (sign-magnitude 15-bit magnitude +
+        # nominal range extended to 6.5 m ceiling to avoid false drops
+        # on real near-max-range targets, see LD2453Parser.cpp §0 and §2).
         PHYS_Y_MIN = 1
-        PHYS_Y_MAX = 6000
-        PHYS_X_ABS = 6000
+        PHYS_Y_MAX = 6500
+        PHYS_X_ABS = 6500
         valid_targets_this_frame = 0
 
         targets_data = frame.get("targets", [])