Case
aiosendspin -> sendspin-cpp
Start the server first, then the client. The client advertises a listener, the server connects in, sends a metadata state update, disconnects, and the matrix compares a normalized metadata snapshot.
Server
aiosendspin
Client
sendspin-cpp
Status
Passed
Metadata snapshot matches
Inspection
Summaries, logs, and builds
Matrix result
RAW{
"case_dir": "artifacts/results/data/macos__server-initiated-metadata__aiosendspin__to__sendspin-cpp",
"client_exit_code": 0,
"client_impl": "sendspin-cpp",
"reason": "Metadata snapshot matches",
"scenario_id": "server-initiated-metadata",
"server_exit_code": 0,
"server_impl": "aiosendspin",
"status": "passed"
}Server summary (JSON)
RAW{
"client": {
"active_roles": [
"metadata@v1"
],
"client_id": "sendspin-cpp-client-id",
"name": "sendspin-cpp-client",
"supported_roles": [
"metadata@v1"
]
},
"discovery_method": "registry_fallback",
"implementation": "aiosendspin",
"initiator_role": "server",
"metadata": {
"expected": {
"album": "Protocol Fixtures",
"album_artist": "Sendspin",
"artist": "Sendspin Conformance",
"artwork_url": "https://example.invalid/almost-silent.jpg",
"progress": {
"playback_speed": 1000,
"track_duration": 180000,
"track_progress": 12000
},
"repeat": "all",
"shuffle": false,
"title": "Almost Silent",
"track": 1,
"year": 2026
}
},
"peer_hello": {
"payload": {
"client_id": "sendspin-cpp-client-id",
"device_info": {
"manufacturer": "Sendspin Conformance",
"product_name": "sendspin-cpp Conformance Client",
"software_version": "0.1.0"
},
"name": "sendspin-cpp-client",
"supported_roles": [
"metadata@v1"
],
"version": 1
},
"type": "client/hello"
},
"preferred_codec": "none",
"role": "server",
"scenario_id": "server-initiated-metadata",
"server_id": "aiosendspin-server",
"server_name": "aiosendspin server",
"status": "ok"
}Server log
RAWINFO:aiosendspin.server.server:Starting Sendspin server on port 18956
INFO:aiosendspin.server.server:Sendspin server started successfully on 127.0.0.1:18956
WARNING:aiosendspin.server.server:No IP addresses available for mDNS advertising. Clients may not be able to discover this server. Consider specifying addresses manually via advertise_addresses.
{
"client": {
"active_roles": [
"metadata@v1"
],
"client_id": "sendspin-cpp-client-id",
"name": "sendspin-cpp-client",
"supported_roles": [
"metadata@v1"
]
},
"discovery_method": "registry_fallback",
"implementation": "aiosendspin",
"initiator_role": "server",
"metadata": {
"expected": {
"album": "Protocol Fixtures",
"album_artist": "Sendspin",
"artist": "Sendspin Conformance",
"artwork_url": "https://example.invalid/almost-silent.jpg",
"progress": {
"playback_speed": 1000,
"track_duration": 180000,
"track_progress": 12000
},
"repeat": "all",
"shuffle": false,
"title": "Almost Silent",
"track": 1,
"year": 2026
}
},
"peer_hello": {
"payload": {
"client_id": "sendspin-cpp-client-id",
"device_info": {
"manufacturer": "Sendspin Conformance",
"product_name": "sendspin-cpp Conformance Client",
"software_version": "0.1.0"
},
"name": "sendspin-cpp-client",
"supported_roles": [
"metadata@v1"
],
"version": 1
},
"type": "client/hello"
},
"preferred_codec": "none",
"role": "server",
"scenario_id": "server-initiated-metadata",
"server_id": "aiosendspin-server",
"server_name": "aiosendspin server",
"status": "ok"
}
Client summary (JSON)
RAW{
"client_id": "sendspin-cpp-client-id",
"client_name": "sendspin-cpp-client",
"implementation": "sendspin-cpp",
"initiator_role": "server",
"metadata": {
"received": {
"album": "Protocol Fixtures",
"album_artist": "Sendspin",
"artist": "Sendspin Conformance",
"artwork_url": "https://example.invalid/almost-silent.jpg",
"progress": {
"playback_speed": 1000,
"track_duration": 180000,
"track_progress": 12000
},
"repeat": "all",
"shuffle": false,
"title": "Almost Silent",
"track": 1,
"year": 2026
},
"update_count": 2
},
"preferred_codec": "none",
"reason": null,
"role": "client",
"scenario_id": "server-initiated-metadata",
"server": {
"connection_reason": "playback",
"name": "aiosendspin server",
"server_id": "aiosendspin-server",
"version": 1
},
"status": "ok",
"stream": null
}Client log
RAWI sendspin.ws_server: Starting server on port: 8928 (max connections: 2)
I sendspin.conn_mgr: Connection handshake complete: server_id=aiosendspin-server, connection_reason=playback
I sendspin.conn_mgr: Current connection lost
{"status":"ok","reason":null,"implementation":"sendspin-cpp","role":"client","scenario_id":"server-initiated-metadata","initiator_role":"server","preferred_codec":"none","client_name":"sendspin-cpp-client","client_id":"sendspin-cpp-client-id","server":{"server_id":"aiosendspin-server","name":"aiosendspin server","version":1,"connection_reason":"playback"},"stream":null,"metadata":{"update_count":2,"received":{"title":"Almost Silent","artist":"Sendspin Conformance","album_artist":"Sendspin","album":"Protocol Fixtures","artwork_url":"https://example.invalid/almost-silent.jpg","year":2026,"track":1,"repeat":"all","shuffle":false,"progress":{"track_progress":12000,"track_duration":180000,"playback_speed":1000}}}}Server build log · python-adapters · built · 0.04s
RAWListing 'src'... Listing 'src/conformance'... Listing 'src/conformance/adapters'... Compiling 'src/conformance/adapters/__init__.py'... Compiling 'src/conformance/adapters/aiosendspin_client.py'... Compiling 'src/conformance/adapters/aiosendspin_server.py'... Compiling 'src/conformance/adapters/placeholder.py'... Compiling 'src/conformance/cli.py'... Compiling 'src/conformance/merge.py'... Compiling 'src/conformance/registry.py'... Listing 'src/sendspin_conformance.egg-info'... Listing 'scripts'... Compiling 'scripts/merge_results.py'... Compiling 'scripts/run_all.py'... Compiling 'scripts/setup_repositories.py'... Compiling 'scripts/setup_workspace.py'...
Client build log · sendspin-cpp-client · built · 63.34s
RAW/IXWebSocketPerMessageDeflateCodec.cpp:194:60: warning: unused parameter 'clientNoContextTakeOver' [-Wunused-parameter]
194 | bool clientNoContextTakeOver)
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.cpp:209:80: warning: unused parameter 'in' [-Wunused-parameter]
209 | bool WebSocketPerMessageDeflateDecompressor::decompress(const std::string& in, std::string& out)
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.cpp:209:97: warning: unused parameter 'out' [-Wunused-parameter]
209 | bool WebSocketPerMessageDeflateDecompressor::decompress(const std::string& in, std::string& out)
| ^
In file included from /Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.cpp:7:
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.h:39:13: warning: private field '_flush' is not used [-Wunused-private-field]
39 | int _flush;
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.h:40:44: warning: private field '_compressBuffer' is not used [-Wunused-private-field]
40 | std::array<unsigned char, 1 << 14> _compressBuffer;
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.h:57:13: warning: private field '_flush' is not used [-Wunused-private-field]
57 | int _flush;
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.h:58:44: warning: private field '_compressBuffer' is not used [-Wunused-private-field]
58 | std::array<unsigned char, 1 << 14> _compressBuffer;
| ^
12 warnings generated.
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp:17:26: warning: unused variable 'minServerMaxWindowBits' [-Wunused-const-variable]
17 | static const uint8_t minServerMaxWindowBits = 8;
| ^~~~~~~~~~~~~~~~~~~~~~
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp:18:26: warning: unused variable 'maxServerMaxWindowBits' [-Wunused-const-variable]
18 | static const uint8_t maxServerMaxWindowBits = 15;
| ^~~~~~~~~~~~~~~~~~~~~~
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp:21:26: warning: unused variable 'minClientMaxWindowBits' [-Wunused-const-variable]
21 | static const uint8_t minClientMaxWindowBits = 8;
| ^~~~~~~~~~~~~~~~~~~~~~
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp:22:26: warning: unused variable 'maxClientMaxWindowBits' [-Wunused-const-variable]
22 | static const uint8_t maxClientMaxWindowBits = 15;
| ^~~~~~~~~~~~~~~~~~~~~~
4 warnings generated.