Add PLI qualifier description to PROVIDE LOCAL INFORMATION decode

- PLI_QUALIFIERS: TS 102 223 qualifier values (Location Info, IMEI,
  NMR, Date/time, Timing Advance, Access Technology, etc.)
- _command_details_name(): appends the qualifier description to
  PROVIDE LOCAL INFORMATION (type 0x26) in Command Details
- decode_cat (FETCH) and decode_tr_command (TR) now use it, so both
  'cat_command' and 'response_to' carry the qualifier (e.g.
  'PROVIDE LOCAL INFORMATION — IMEI')

tests: PLI qualifier cases (TR/FETCH, IMEI/location/date, non-PLI)

simtrace2_pysniff/server/decode.py

@@ -478,6 +478,51 @@ def parse_tlv(data):
     return tlvs
 
 
+# TS 102 223 — PROVIDE LOCAL INFORMATION command qualifier values
+PLI_QUALIFIERS = {
+    0x00: 'Location Info (MCC, MNC, LAC/TAC, Cell ID)',
+    0x01: 'IMEI',
+    0x02: 'Network Measurement results',
+    0x03: 'Date, time and time zone',
+    0x04: 'Language setting',
+    0x05: 'Timing Advance',
+    0x06: 'Access Technology (single)',
+    0x08: 'IMEISV',
+    0x09: 'Search Mode',
+    0x0A: 'Battery charge state',
+    0x0C: 'Current WSID',
+    0x0D: 'Broadcast Network info',
+    0x0E: 'Multiple Access Technologies',
+    0x0F: 'Location Info (multi-RAT)',
+    0x10: 'NMR (multi-RAT)',
+    0x11: 'CSG ID list + HNB name',
+    0x12: 'H(e)NB IP address',
+    0x13: 'H(e)NB surrounding macrocells',
+    0x14: 'Current WLAN identifier',
+    0x15: 'Slices information',
+    0x16: 'CAG information list',
+    0x17: 'Rejected slices information',
+}
+
+
+def _command_details_name(value):
+    """Decode a Command Details TLV value (number, type, qualifier).
+
+    Returns the command type name, with the PLI qualifier description
+    appended for PROVIDE LOCAL INFORMATION (type 0x26).
+    """
+    if len(value) < 2:
+        return None
+    name = CAT_COMMAND_TYPES.get(value[1])
+    if not name:
+        return None
+    if value[1] == 0x26 and len(value) >= 3:  # PROVIDE LOCAL INFORMATION
+        q = PLI_QUALIFIERS.get(value[2])
+        if q:
+            name = f'{name} — {q}'
+    return name
+
+
 def decode_cat(ins, body):
     """Decode a CAT (TS 102 223) payload, returning the command/event name.
 
@@ -493,8 +538,8 @@ def decode_cat(ins, body):
             if tag != 0xD0:
                 continue
             for t2, _l2, v2 in parse_tlv(value):
-                if t2 == 0x81 and len(v2) >= 2:
-                    return CAT_COMMAND_TYPES.get(v2[1])
+                if t2 == 0x81:
+                    return _command_details_name(v2)
     elif ins == 0xC2:  # ENVELOPE → envelope type
         return ENVELOPE_TYPES.get(body[0])
     return None
@@ -508,8 +553,8 @@ def decode_tr_command(body):
     if not body:
         return None
     for tag, _length, value in parse_tlv(body):
-        if tag == 0x81 and len(value) >= 2:
-            return CAT_COMMAND_TYPES.get(value[1])
+        if tag == 0x81:
+            return _command_details_name(value)
     return None
 
 

tests/test_decode.py

@@ -58,7 +58,8 @@ class TestCatDecoding(unittest.TestCase):
     def test_fetch_provide_local_info(self):
         r = decode_message(bytes.fromhex(
             '801200000BD0098103012600820281829000'))
-        self.assertEqual(r['cat_command'], 'PROVIDE LOCAL INFORMATION')
+        self.assertEqual(r['cat_command'],
+                         'PROVIDE LOCAL INFORMATION — Location Info (MCC, MNC, LAC/TAC, Cell ID)')
 
     def test_envelope_event_download(self):
         r = decode_message(bytes.fromhex(
@@ -138,6 +139,30 @@ class TestTerminalResponse(unittest.TestCase):
         self.assertEqual(r['response_to'], 'POLL INTERVAL')
 
 
+class TestPliQualifier(unittest.TestCase):
+    def test_tr_pli_imei(self):
+        r = decode_message(bytes.fromhex(
+            '8014000016810301260102028281030106130952F0991EC57A68009F'))
+        self.assertEqual(r['response_to'], 'PROVIDE LOCAL INFORMATION — IMEI')
+
+    def test_fetch_pli_location(self):
+        r = decode_message(bytes.fromhex(
+            '801200000BD0098103012600820281829000'))
+        self.assertEqual(r['cat_command'],
+                         'PROVIDE LOCAL INFORMATION — Location Info (MCC, MNC, LAC/TAC, Cell ID)')
+
+    def test_fetch_pli_date_time(self):
+        r = decode_message(bytes.fromhex(
+            '801200000BD0098103012603820281829000'))
+        self.assertEqual(r['cat_command'],
+                         'PROVIDE LOCAL INFORMATION — Date, time and time zone')
+
+    def test_non_pli_no_qualifier(self):
+        r = decode_message(bytes.fromhex(
+            '801400000C810301250002028281830100910F'))
+        self.assertEqual(r['response_to'], 'SET UP MENU')
+
+
 class TestGetResponseContext(unittest.TestCase):
     GET_RESPONSE = bytes.fromhex('00C000002962278202782183023F00A50A800171')