TERMINAL RESPONSE: label as 'TERMINAL RESPONSE', keep command type as context

decode.py: split decode_tr_command() out of decode_cat(); TR (0x14)
now stores the echoed proactive command type in 'response_to' instead
of 'cat_command', so it no longer overrides the INS name.

FETCH/ENVELOPE still use cat_command as the primary label.

tests: TR now asserts response_to + no cat_command

simtrace2_pysniff/server/decode.py

@@ -497,7 +497,16 @@ def decode_cat(ins, body):
                     return CAT_COMMAND_TYPES.get(v2[1])
     elif ins == 0xC2:  # ENVELOPE → envelope type
         return ENVELOPE_TYPES.get(body[0])
-    elif ins == 0x14:  # TERMINAL RESPONSE → echoes proactive command type
+    return None
+
+
+def decode_tr_command(body):
+    """Extract the proactive command type echoed in a TERMINAL RESPONSE body.
+
+    Returns the CAT command name (context the TR is responding to), or None.
+    """
+    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])
@@ -575,6 +584,11 @@ def decode_message(raw_data, prev=None):
             if h in fids:
                 result['body']['note'] = fids[h]
 
+        if ins == 0x14:
+            response_to = decode_tr_command(body)
+            if response_to:
+                result['response_to'] = response_to
+        else:
             cat_command = decode_cat(ins, body)
             if cat_command:
                 result['cat_command'] = cat_command

tests/test_decode.py

@@ -66,11 +66,12 @@ class TestCatDecoding(unittest.TestCase):
         self.assertEqual(r['ins_name'], 'ENVELOPE')
         self.assertEqual(r['cat_command'], 'EVENT DOWNLOAD')
 
-    def test_tr_has_cat(self):
+    def test_tr_has_response_to(self):
         r = decode_message(bytes.fromhex(
             '801400000C8103010500020282810301009130'))
         self.assertEqual(r['ins_name'], 'TERMINAL RESPONSE')
-        self.assertEqual(r['cat_command'], 'SET UP EVENT LIST')
+        self.assertNotIn('cat_command', r)
+        self.assertEqual(r['response_to'], 'SET UP EVENT LIST')
 
     def test_select_no_cat(self):
         r = decode_message(bytes.fromhex('a0a40000023f009000'))
@@ -124,17 +125,17 @@ class TestTerminalResponse(unittest.TestCase):
         r = decode_message(bytes.fromhex(
             '801400000C8103010500020282810301009130'))
         self.assertEqual(r['ins_name'], 'TERMINAL RESPONSE')
-        self.assertEqual(r['cat_command'], 'SET UP EVENT LIST')
+        self.assertEqual(r['response_to'], 'SET UP EVENT LIST')
 
     def test_tr_setup_menu(self):
         r = decode_message(bytes.fromhex(
             '801400000C810301250002028281830100910F'))
-        self.assertEqual(r['cat_command'], 'SET UP MENU')
+        self.assertEqual(r['response_to'], 'SET UP MENU')
 
     def test_tr_poll_interval(self):
         r = decode_message(bytes.fromhex(
             '80140000108103010300020282810301000402011E9000'))
-        self.assertEqual(r['cat_command'], 'POLL INTERVAL')
+        self.assertEqual(r['response_to'], 'POLL INTERVAL')
 
 
 class TestGetResponseContext(unittest.TestCase):