Case
aiosendspin -> SendspinKit
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
SendspinKit
Status
Passed
Metadata snapshot matches
Inspection
Summaries, logs, and builds
Matrix result
RAW{
"case_dir": "artifacts/results/data/macos__server-initiated-metadata__aiosendspin__to__SendspinKit",
"client_exit_code": 0,
"client_impl": "SendspinKit",
"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": [],
"client_id": "SendspinKit-client-id",
"name": "SendspinKit-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
},
"title": "Almost Silent",
"track": 1,
"year": 2026
}
},
"peer_hello": {
"payload": {
"client_id": "SendspinKit-client-id",
"device_info": {
"manufacturer": "Apple",
"product_name": "Mac",
"software_version": "Version 26.4 (Build 25E246)"
},
"name": "SendspinKit-client",
"supported_roles": [
"metadata@v1"
],
"trust_level": "none",
"unpaired_access": {
"enabled": false
},
"version": 1
},
"type": "client/hello"
},
"preferred_codec": "none",
"role": "server",
"scenario_id": "server-initiated-metadata",
"server_id": "UYEOr-fnKHAUi7NKSFHr3kcvwcSpFwsw4gILbGXLm34",
"server_name": "aiosendspin server",
"status": "ok"
}Server log
RAWINFO:aiosendspin.server.server:Starting Sendspin server on port 18966
INFO:aiosendspin.server.server:Sendspin server started successfully on 127.0.0.1:18966
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.
WARNING:aiosendspin.server.connection.unknown-client:Accepting unencrypted legacy connection (transition mode)
INFO:aiosendspin.server.client.SendspinKit-client-id:non-compliant client: client/state used the legacy top-level 'state' field
WARNING:aiosendspin.server.connection.SendspinKit-client-id:WebSocket closed, close_code=1006
{
"client": {
"active_roles": [],
"client_id": "SendspinKit-client-id",
"name": "SendspinKit-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
},
"title": "Almost Silent",
"track": 1,
"year": 2026
}
},
"peer_hello": {
"payload": {
"client_id": "SendspinKit-client-id",
"device_info": {
"manufacturer": "Apple",
"product_name": "Mac",
"software_version": "Version 26.4 (Build 25E246)"
},
"name": "SendspinKit-client",
"supported_roles": [
"metadata@v1"
],
"trust_level": "none",
"unpaired_access": {
"enabled": false
},
"version": 1
},
"type": "client/hello"
},
"preferred_codec": "none",
"role": "server",
"scenario_id": "server-initiated-metadata",
"server_id": "UYEOr-fnKHAUi7NKSFHr3kcvwcSpFwsw4gILbGXLm34",
"server_name": "aiosendspin server",
"status": "ok"
}
Client summary (JSON)
RAW{
"client_id": "SendspinKit-client-id",
"client_name": "SendspinKit-client",
"implementation": "SendspinKit",
"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
},
"title": "Almost Silent",
"track": 1,
"year": 2026
},
"update_count": 2
},
"peer_hello": {
"payload": {
"connection_reason": "playback",
"name": "aiosendspin server",
"server_id": "UYEOr-fnKHAUi7NKSFHr3kcvwcSpFwsw4gILbGXLm34",
"version": 1
},
"type": "server/hello"
},
"preferred_codec": "none",
"role": "client",
"scenario_id": "server-initiated-metadata",
"server": {
"connection_reason": "playback",
"name": "aiosendspin server",
"server_id": "UYEOr-fnKHAUi7NKSFHr3kcvwcSpFwsw4gILbGXLm34",
"version": 1
},
"status": "ok"
}Client log
RAW[ADAPTER] Listening for server connection on ws://127.0.0.1:19966/sendspin
[ADAPTER] Connected to server: aiosendspin server
[ADAPTER] Metadata: (nil)
[ADAPTER] Metadata: Almost Silent
{
"client_id" : "SendspinKit-client-id",
"client_name" : "SendspinKit-client",
"implementation" : "SendspinKit",
"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
},
"title" : "Almost Silent",
"track" : 1,
"year" : 2026
},
"update_count" : 2
},
"peer_hello" : {
"payload" : {
"connection_reason" : "playback",
"name" : "aiosendspin server",
"server_id" : "UYEOr-fnKHAUi7NKSFHr3kcvwcSpFwsw4gILbGXLm34",
"version" : 1
},
"type" : "server\/hello"
},
"preferred_codec" : "none",
"role" : "client",
"scenario_id" : "server-initiated-metadata",
"server" : {
"connection_reason" : "playback",
"name" : "aiosendspin server",
"server_id" : "UYEOr-fnKHAUi7NKSFHr3kcvwcSpFwsw4gILbGXLm34",
"version" : 1
},
"status" : "ok"
}
[ADAPTER] Summary written to artifacts/results/data/macos__server-initiated-metadata__aiosendspin__to__SendspinKit/client-summary.json
Server build log · python-adapters · built · 0.20s
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/adapters/sendspin_jvm_client.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/detect_regressions.py'... Compiling 'scripts/merge_results.py'... Compiling 'scripts/run_all.py'... Compiling 'scripts/setup_repositories.py'... Compiling 'scripts/setup_workspace.py'...
Client build log · SendspinKit-client · built · 41.07s
RAWtaPlaneCommand.swift [35/73] Compiling SendspinKit DataPlaneSink.swift [36/73] Compiling SendspinKit NoOpAudioOutput.swift [37/73] Compiling SendspinKit PCMRingBuffer.swift [38/73] Compiling SendspinKit SyncCorrection.swift [39/73] Compiling SendspinKit VolumeController.swift [40/73] Compiling SendspinKit ArtworkConfiguration.swift [41/73] Compiling SendspinKit ClientTypes.swift [42/73] Compiling SendspinKit ClockSyncStats.swift [43/73] Compiling SendspinKit ConnectionEvent.swift [44/73] Compiling SendspinKit ConnectionState.swift [45/73] Compiling SendspinKit ControlEventSink.swift [46/73] Compiling SendspinKit PlayerConfiguration.swift [47/73] Compiling SendspinKit SendspinClient+ClockSync.swift [48/73] Compiling SendspinKit SendspinClient+Commands.swift [49/73] Compiling SendspinKit SendspinClient+Discovery.swift [50/73] Compiling SendspinKit ClientRole.swift [51/73] Compiling SendspinKit ClientStateMessages.swift [52/73] Compiling SendspinKit CommandMessages.swift [53/73] Compiling SendspinKit GoodbyeMessage.swift [54/73] Compiling SendspinKit HelloMessages.swift [55/73] Compiling SendspinKit SendspinMessage.swift [56/73] Compiling SendspinKit ServerStateMessages.swift [57/73] Compiling SendspinKit StreamMessages.swift [58/73] Compiling SendspinKit TimeMessages.swift [59/73] Compiling SendspinKit SendspinKit.swift [60/73] Compiling SendspinKit ClockSyncProtocol.swift [61/73] Compiling SendspinKit ClockSynchronizer.swift [62/73] Compiling SendspinKit MonotonicClock.swift [63/73] Compiling SendspinKit SendspinTimeFilter.swift [64/73] Compiling SendspinKit TimeFilterSnapshot.swift [65/73] Compiling SendspinKit FrameInbox.swift [66/73] Compiling SendspinKit NWWebSocketTransport.swift [67/73] Compiling SendspinKit SendspinEncoding.swift [68/73] Compiling SendspinKit SendspinTransport.swift [69/73] Compiling SendspinKit TransportError.swift [70/73] Compiling SendspinKit WatermarkedSink.swift [71/75] Compiling ConformanceSendspinKitClient main.swift [72/75] Emitting module ConformanceSendspinKitClient [72/75] Write Objects.LinkFileList [73/75] Linking ConformanceSendspinKitClient [74/75] Applying ConformanceSendspinKitClient Build complete! (30.21s) Fetching https://github.com/sbooth/flac-binary-xcframework.git Fetching https://github.com/sbooth/ogg-binary-xcframework.git [1/32] Fetching flac-binary-xcframework [33/55] Fetching flac-binary-xcframework, ogg-binary-xcframework Fetched https://github.com/sbooth/ogg-binary-xcframework.git from cache (0.43s) Fetched https://github.com/sbooth/flac-binary-xcframework.git from cache (0.43s) Fetching https://github.com/alta/swift-opus.git [1/783] Fetching swift-opus Fetched https://github.com/alta/swift-opus.git from cache (0.50s) Creating working copy for https://github.com/sbooth/flac-binary-xcframework.git Creating working copy for https://github.com/sbooth/ogg-binary-xcframework.git Creating working copy for https://github.com/alta/swift-opus.git Working copy of https://github.com/sbooth/ogg-binary-xcframework.git resolved at 0.1.3 Working copy of https://github.com/sbooth/flac-binary-xcframework.git resolved at 0.2.0 Working copy of https://github.com/alta/swift-opus.git resolved at 0.0.2 Downloading binary artifact https://github.com/sbooth/ogg-binary-xcframework/releases/download/0.1.3/ogg.xcframework.zip Downloading binary artifact https://github.com/sbooth/flac-binary-xcframework/releases/download/0.2.0/FLAC.xcframework.zip [32768/3922418] Downloading https://github.com/sbooth/flac-binary-xcframework/releases/download/0.2.0/FLAC.xcframework.zip [65518/4541165] Downloading https://github.com/sbooth/flac-binary-xcframework/releases/download/0.2.0/FLAC.xcframework.zip, https://github.com/sbooth/ogg-binary-xcframework/releases/download/0.1.3/ogg.xcframework.zip Downloaded https://github.com/sbooth/ogg-binary-xcframework/releases/download/0.1.3/ogg.xcframework.zip (0.64s) Downloaded https://github.com/sbooth/flac-binary-xcframework/releases/download/0.2.0/FLAC.xcframework.zip (0.81s)