[PATCH BlueZ v1 04/11] test: functional: answer the notification registered by the victim

[Luiz Augusto von Dentz <luiz.dentz@gmail.com>]

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

The AVRCP target of the NN-2026-0145 test tells the victim it supports
the track changed event, so the victim registers a notification for it,
but the target never answers it.

The request then times out after 10 seconds, is retried once, and times
out again, so the victim only sends the ListPlayerAttributes the test
needs 20 seconds later, which is most of the time the test takes.

Answer it with an interim response, as a target would.

Assisted-by: opencode:claude-opus-5
---
 test/functional/test_avrcp.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/test/functional/test_avrcp.py b/test/functional/test_avrcp.py
index f6ede96cbc0b..da892d1e8be2 100644
--- a/test/functional/test_avrcp.py
+++ b/test/functional/test_avrcp.py
@@ -70,6 +70,7 @@ def check_avrcp_GHSA_m2vx_pw5f_rc8v(bus):
     AVCTP_RESPONSE = 1
     AVC_CTYPE_ACCEPTED = 0x09
     AVC_CTYPE_STABLE = 0x0C
+    AVC_CTYPE_INTERIM = 0x0F
     AVC_OP_VENDORDEP = 0x00
     AVC_SUBUNIT_PANEL = 0x09
 
@@ -213,6 +214,18 @@ def check_avrcp_GHSA_m2vx_pw5f_rc8v(bus):
                     )
                 elif pdu_id == PDU_REGISTER_NOTIFICATION:
                     print("[*] RegisterNotification: %s" % hexdump(params), flush=True)
+
+                    # Answer as a target would, otherwise the request
+                    # times out and is retried, and the controller only
+                    # moves on to the next one 20 seconds later
+                    self.response(
+                        transaction,
+                        AVC_CTYPE_INTERIM,
+                        avrcp_pdu(
+                            PDU_REGISTER_NOTIFICATION,
+                            bytes([EVENT_TRACK_CHANGED]) + bytes(8),
+                        ),
+                    )
                 else:
                     self.response(transaction, 0x0A, avrcp_pdu(pdu_id, b"\x00"))
 
-- 
2.55.0