fix(protocol): add record_time based chunk scaling for longer event record times

sfm/server.py

@@ -885,13 +885,22 @@ def device_event_blastware_file(
         def _do():
             with _build_client(port, baud, host, tcp_port, timeout=120.0) as client:
                 info = client.connect()
-                # Use full_waveform=False (stop_after_metadata=True) — stops when
-                # "Project:" is found in the 5A stream.  Content is byte-identical to
-                # BW for Continuous/Single-Shot events; our file is slightly shorter
-                # (~286 bytes of extra ADC signal BW includes past the metadata).
-                # full_waveform=True corrupts the body: silence chunks past the event
-                # contain device-internal pointers that embed extra STRT records.
-                events = client.get_events(full_waveform=False, stop_after_index=index)
+                # Calculate extra ADC chunks to download after finding "Project:".
+                # BW downloads ~2 extra chunks per second of record time.
+                # Without enough extra chunks the termination response contains no
+                # footer bytes and Blastware rejects the file.
+                rectime = 1.0
+                try:
+                    rectime = float(info.compliance_config.record_time or 1.0)
+                except (AttributeError, TypeError, ValueError):
+                    pass
+                extra_chunks = max(1, round(rectime * 2))
+                log.info("blastware_file: rectime=%.1fs → extra_chunks=%d", rectime, extra_chunks)
+                events = client.get_events(
+                    full_waveform=False,
+                    stop_after_index=index,
+                    extra_chunks_after_metadata=extra_chunks,
+                )
                 matching = [ev for ev in events if ev.index == index]
                 return matching[0] if matching else None, info
         ev, info = _run_with_retry(_do, is_tcp=_is_tcp(host))