added s11 collections

python_app/orchestration/shm/decoder.py

@@ -14,8 +14,8 @@ from python_app.models.dataset_model import (
 )
 from python_app.orchestration.shm.binary_cursor import ByteCursor
 
-RAW_MAGIC = 0x31574152
-PREPROC_MAGIC = 0x31525050
+RAW_MAGIC = 0x32574152
+PREPROC_MAGIC = 0x32525050
 RESULT_MAGIC = 0x314C5352
 
 
@@ -40,6 +40,9 @@ def decode_trace_collection(payload: bytes, expected_magic: int) -> SweepCollect
         freq = np.frombuffer(cursor.read_bytes(freq_bytes), dtype="<f4").astype(np.float32, copy=False)
 
         interleaved_bytes = point_count * 8
+        # Runtime trace payloads now carry S11 before S21. The Python layer
+        # still works with S21 only for now, so consume and discard S11 here.
+        cursor.read_bytes(interleaved_bytes)
         interleaved = np.frombuffer(cursor.read_bytes(interleaved_bytes), dtype="<f4")
         s21 = (interleaved[0::2] + 1j * interleaved[1::2]).astype(np.complex64, copy=False)