fix(obp-proxy): drop per-packet RX debug for voice, not once-per-stream

#82 logged the RX debug line once per stream_id per bridge, but a bridge
with BOTH_SLOTS/several concurrent talkgroups interleaves packets from
multiple calls, so the "last seen" stream flips almost every packet and
the line logs nearly as often as before the fix — confirmed against
production output (three interleaved streams on OBP-CL).

DMRD/DMRE demux by NETWORK_ID, which is never ambiguous, and
*CALL START*/*CALL END* (application/routing_use_cases.py,
application/routing/obp_forward.py) already log once per real call with
better detail (SUB, TGID, TS, duration). Drop the fan-in RX line for voice
frames entirely instead of trying to approximate "once per call" with no
session state; control frames (BCKA/BCSQ/BCST/BCVE) keep logging every
time, since they are rare and that visibility mattered for the #79 fix.

src/adn_server/infrastructure/proxy/obp_fanin.py

@@ -181,7 +181,6 @@ class ObpFanInDemux:
         self._registry = registry
         self.debug = debug
         self._log = logger or _logger
-        self._last_stream: dict[str, bytes] = {}
 
     def deliver(
         self,
@@ -210,29 +209,17 @@ class ObpFanInDemux:
         entry = self._registry.bridges.get(system_name)
         if entry is None:
             return
-        if self.debug:
-            opcode = data[:4]
-            if opcode in (DMRD, DMRE) and len(data) >= 20:
-                stream_id = data[16:20]
-                if self._last_stream.get(system_name) != stream_id:
-                    self._last_stream[system_name] = stream_id
-                    self._log.debug(
-                        "(OBP_PROXY) RX %s from %s:%s stream=%s -> %s",
-                        opcode,
-                        host,
-                        port,
-                        stream_id.hex(),
-                        system_name,
-                    )
-            else:
-                self._log.debug(
-                    "(OBP_PROXY) RX %s from %s:%s len=%d -> %s",
-                    opcode,
-                    host,
-                    port,
-                    len(data),
-                    system_name,
-                )
+        if self.debug and data[:4] not in (DMRD, DMRE):
+            # DMRD/DMRE demux by NETWORK_ID, never ambiguous; *CALL START*/*CALL END*
+            # (routing_use_cases.py) already give once-per-call visibility for those.
+            self._log.debug(
+                "(OBP_PROXY) RX %s from %s:%s len=%d -> %s",
+                data[:4],
+                host,
+                port,
+                len(data),
+                system_name,
+            )
         entry.reply_transport.note_ingress(transport)
         entry.sink.inject(data, addr)
 

tests/infrastructure/test_obp_proxy.py

@@ -22,6 +22,8 @@
 
 from __future__ import annotations
 
+import logging
+
 import pytest
 from tests.conftest import minimal_valid_config
 
@@ -570,11 +572,12 @@ def test_control_frame_prefers_configured_peer_over_relaxed_target() -> None:
     assert not protocols["OBP-FR"].packets
 
 
-def test_debug_rx_log_once_per_stream(caplog) -> None:
-    """A call sends many DMRD/DMRE packets; the RX debug line must fire once per
-    stream_id, not once per packet, or an active call floods the log."""
-    import logging as _logging
-
+def test_debug_does_not_log_voice_packets(caplog) -> None:
+    """DMRD/DMRE demux by NETWORK_ID, never ambiguous, and *CALL START*/*CALL END*
+    (routing_use_cases.py) already give once-per-call visibility. Concurrent calls
+    on the same bridge (BOTH_SLOTS, several TGs) interleave stream_ids packet by
+    packet, so any per-stream tracking here would still log almost every packet —
+    so voice frames are not logged at all, only control frames are."""
     receiver = _RecordingObp()
     transport = _RecordingTransport()
     registry = ObpBridgeRegistry()
@@ -588,13 +591,12 @@ def test_debug_rx_log_once_per_stream(caplog) -> None:
         )
     )
     demux = ObpFanInDemux(registry, debug=True)
-    caplog.set_level(_logging.DEBUG)
+    caplog.set_level(logging.DEBUG)
 
-    wire_a = build_dmrd_v1(_sample_dmr_voice(stream_id=0x11111111), _NETWORK, _PASS)
-    for _ in range(5):
-        demux.deliver(wire_a, _ADDR, local_port=62032, transport=transport)
-    assert sum("RX" in r.getMessage() for r in caplog.records) == 1
+    for stream in (0x11111111, 0x22222222, 0x11111111, 0x22222222):
+        wire = build_dmrd_v1(_sample_dmr_voice(stream_id=stream), _NETWORK, _PASS)
+        demux.deliver(wire, _ADDR, local_port=62032, transport=transport)
+    assert not any("RX" in r.getMessage() for r in caplog.records)
 
-    wire_b = build_dmrd_v1(_sample_dmr_voice(stream_id=0x22222222), _NETWORK, _PASS)
-    demux.deliver(wire_b, _ADDR, local_port=62032, transport=transport)
-    assert sum("RX" in r.getMessage() for r in caplog.records) == 2
+    demux.deliver(build_bcka(_PASS), _ADDR, local_port=62032, transport=transport)
+    assert sum("RX" in r.getMessage() for r in caplog.records) == 1