Decode sigrok-iso7816-stream RST/VCC line events (GSMTAP 0x10/0x11)

Support the sigrok-iso7816-stream decoder (FX2 logic-analyzer passive
SIM sniffer, github.com/anttro/sigrok_iso7816_stream) which streams
GSMTAP-SIM on UDP 4729 and adds two custom sub-types for line events.

- gsmtap.py: GSMTAP_SIM_RST_EVENT (0x10) / GSMTAP_SIM_VCC_EVENT (0x11).
- capture.py: gsmtap_msg_type() maps 0x10→'rst', 0x11→'vcc' (shared by
  the listener and tests); pcap.py _SUB_TYPE_NAMES gains the same
  entries so PCAP re-imports of these captures preserve the events.
- decode.py: decode_line_event() decodes [direction, level, reserved]
  into reset asserted/de-asserted or power applied/removed + level;
  routed through decode_sniff_msg.
- database.py: reset-assert and power-removal invalidate the per-channel
  file selection (card-level transition); de-assert / power-on are
  markers only.
- frontend: RST/VCC labels (RESET ASSERTED / VCC OFF, …), a detail-view
  branch (Event + Level + raw), and list styling (.apdu-type.rst/.vcc).

README notes the custom sub-type compatibility. Tests: +8 (line-event
vectors, sniff routing, subtype + PCAP round-trip mappings) — 359
total. Version 1.21.0, SW cache simtrace-analyser-v31.

simtrace2_pysniff/server/capture.py

@@ -3,7 +3,21 @@
 import time
 import threading
 
-from ..gsmtap import GsmtapReceiver, GSMTAP_SIM_ATR, GSMTAP_SIM_APDU
+from ..gsmtap import (GsmtapReceiver, GSMTAP_SIM_ATR,
+                      GSMTAP_SIM_RST_EVENT, GSMTAP_SIM_VCC_EVENT)
+
+
+def gsmtap_msg_type(sub_type):
+    """Map a GSMTAP-SIM sub_type to a stored message type.
+
+    Custom sigrok-iso7816-stream line events (0x10/0x11) become 'rst'/'vcc';
+    everything except ATR defaults to 'tpdu'.
+    """
+    return {
+        GSMTAP_SIM_ATR: 'atr',
+        GSMTAP_SIM_RST_EVENT: 'rst',
+        GSMTAP_SIM_VCC_EVENT: 'vcc',
+    }.get(sub_type, 'tpdu')
 
 
 class GsmtapListener:
@@ -23,8 +37,7 @@ class GsmtapListener:
             sub_type, data = self._receiver.read_packet()
             if sub_type is None:
                 continue
-            msg_type = 'atr' if sub_type == GSMTAP_SIM_ATR else 'tpdu'
-            yield msg_type, data, 0
+            yield gsmtap_msg_type(sub_type), data, 0
 
 
 class DirectSniffer:

simtrace2_pysniff/server/database.py

@@ -377,5 +377,16 @@ class Database:
                 if msg['flags'] & (CHANGE_FLAG_CARD_INSERT | CHANGE_FLAG_CARD_EJECT |
                                    CHANGE_FLAG_RESET_ASSERT | CHANGE_FLAG_RESET_DEASSERT):
                     states = {}
+            elif msg['type'] in ('rst', 'vcc'):
+                # sigrok-iso7816-stream line events: a reset assert or power
+                # removal destroys the card's selection state.  De-assert /
+                # power-on are markers only (the following ATR resets state).
+                data = row[4] if len(row) > 4 and row[4] else b''
+                if msg['type'] == 'rst':
+                    if data and data[0] == 1:  # asserted
+                        states = {}
+                else:  # vcc
+                    if data and data[0] == 0:  # power removed
+                        states = {}
             msgs.append(msg)
         return msgs

simtrace2_pysniff/server/decode.py

@@ -4002,6 +4002,26 @@ def decode_change(flags):
     }
 
 
+def decode_line_event(raw_data, kind):
+    """Decode a sigrok-iso7816-stream RST/VCC line event (GSMTAP sub_type
+    0x10/0x11): payload [direction, level, reserved].
+
+    direction — RST: 1 = asserted (high→low), 0 = de-asserted (low→high);
+    VCC: 1 = power applied (low→high), 0 = removed (high→low).
+    level — resulting line level: 0 = low, 1 = high.
+    """
+    result = {'type': kind}
+    if raw_data and len(raw_data) >= 2:
+        direction, level = raw_data[0], raw_data[1]
+        if kind == 'rst':
+            result['event'] = 'reset asserted' if direction else 'reset de-asserted'
+        else:
+            result['event'] = 'power applied' if direction else 'power removed'
+        result['level'] = 'high' if level else 'low'
+        result['raw'] = raw_data.hex().upper()
+    return result
+
+
 def decode_data_flags(flags):
     """Decode SIMtrace2 sniff_data error flags into a list of names (or None)."""
     if not flags:
@@ -4260,6 +4280,8 @@ def decode_sniff_msg(raw_data, msg_type, flags=0, prev=None):
         return result
     if msg_type == 'change':
         return decode_change(flags)
+    if msg_type in ('rst', 'vcc'):
+        return decode_line_event(raw_data, msg_type)
     if msg_type == 'fidi' and raw_data:
         return decode_fidi(raw_data)
     if msg_type == 'atr':