fix(protocol): fetch additional chunk after metadata to ensure valid termination response

minimateplus/protocol.py

@@ -646,7 +646,27 @@ class MiniMateProtocol:
             frames_data.append(rsp)
 
             if stop_after_metadata and b"Project:" in rsp.data:
-                log.debug("5A A5[%d] metadata found — stopping early", chunk_num)
+                # Download exactly one more chunk after finding metadata — this is
+                # what Blastware does.  The extra chunk contains the tail ADC data
+                # and primes the device to return a valid footer in the termination
+                # response.  Without it, termination returns an empty ack with no
+                # footer bytes (confirmed 2026-04-23 from HxD comparison).
+                log.debug("5A A5[%d] metadata found — fetching one more chunk then stopping", chunk_num)
+                chunk_num += 1
+                counter = chunk_num * _BULK_COUNTER_STEP
+                params = bulk_waveform_params(key4, counter)
+                self._send(build_5a_frame(_BULK_CHUNK_OFFSET, params))
+                try:
+                    extra = self._recv_one(expected_sub=rsp_sub, timeout=10.0)
+                    log.debug("5A A5[%d] extra chunk page_key=0x%04X data_len=%d",
+                              chunk_num, extra.page_key, len(extra.data))
+                    if extra.page_key == 0x0000:
+                        if include_terminator:
+                            frames_data.append(extra)
+                        return frames_data
+                    frames_data.append(extra)
+                except TimeoutError:
+                    log.debug("5A extra chunk timed out — end of stream")
                 break
         else:
             log.warning(