サーバー変更につきraspotify→spoconに変更した。

[2023/05/27追記]
spotifyの認証周りが変更されたので、librespotのバージョンを確認する必要があります。
こちらからlibrespot-api-1.6.3.jarをダウンロードし、
opt/spocon/llibrespot-java-api-v1.6.2.jarを削除し、librespot-api-1.6.3.jarをlibrespot-java-api-v1.6.2.jarと同名に書き換えた後、spoconを再起動する必要があります。
音楽サーバーをラズパイからheroboxに変更した。
raspotifyが少し不安定になりそうだったのでspoconに変更した。
基本的なインストール方法、運用方法はraspotifyと同じなのだが、設定は opt/spocon/conig.toml にて行うようになっている。
config.tomlはこんな感じ
### Device type (COMPUTER, TABLET, SMARTPHONE, SPEAKER, TV, AVR, STB, AUDIO_DONGLE, GAME_CONSOLE, CAST_VIDEO, CAST_AUDIO, AUTOMOBILE, WEARABLE, UNKNOWN_SPOTIFY, CAR_THING, UNKNOWN) ###
deviceType = "AUDIO_DONGLE"
### Device name ###
deviceName = "【ここに名前】"
### Device ID (40 chars, leave empty for random) ###
deviceId = ""
### Log level (OFF, FATAL, ERROR, WARN, INFO, DEBUG, TRACE, ALL) ###
logLevel = "TRACE"
### Preferred locale ###
preferredLocale = "en"
### Cache ###
[cache]
dir = "./cache/"
# Cache enabled
enabled = true
doCleanUp = true
### Authentication ###
[auth]
# Credentials file (JSON)
credentialsFile = ""
# Spotify password (USER_PASS only)
password = "【ここにパスワード】"
# Spotify authentication blob Base64-encoded (BLOB only)
blob = ""
# Whether to store reusable credentials on disk (not a plain password)
storeCredentials = false
# Strategy (USER_PASS, ZEROCONF, BLOB, FACEBOOK, STORED)
strategy = "USER_PASS"
# Spotify username (BLOB, USER_PASS only)
username = "【ここにユーザー名】"
### Preload ###
[preload]
# Preload enabled
enabled = true
### Network ###
[network]
# If ping isn't received within this amount of seconds, reconnect
connectionTimeout = 10
### Proxy ###
[proxy]
# Basic auth password
password = ""
# The proxy hostname
address = ""
# The proxy port
port = 0
# Whether authentication is enabled on the server
auth = false
# The proxy type (HTTP, SOCKS)
type = "HTTP"
# Connect to proxy using SSL (HTTP only)
ssl = false
# Whether the proxy is enabled
enabled = false
# Basic auth username
username = ""
### Zeroconf ###
[zeroconf]
# Listen on all interfaces (overrides `zeroconf.interfaces`)
listenAll = true
# Listen on these interfaces (comma separated list of names)
interfaces = ""
# Listen on this TCP port (`-1` for random)
listenPort = 1704
### Shell ###
[shell]
onTrackSeeked = ""
onStartedLoading = ""
onConnectionDropped = ""
onMetadataAvailable = ""
onTrackChanged = ""
onPanicState = ""
onFinishedLoading = ""
# Shell events enabled
enabled = false
onPlaybackResumed = ""
onConnectionEstablished = ""
onPlaybackEnded = ""
onContextChanged = ""
# Execute the command with `bash -c`
executeWithBash = false
onPlaybackPaused = ""
onInactiveSession = ""
onVolumeChanged = ""
### Time correction ###
[time]
# Manual time correction in millis
manualCorrection = 0
# Time synchronization method (NTP, PING, MELODY, MANUAL)
synchronizationMethod = "NTP"
### API ###
[api]
# API port (`api` module only)
port = 24879
# API listen interface (`api` module only)
host = "0.0.0.0"
### Player ###
[player]
# Whether to apply the Spotify loudness normalisation
enableNormalisation = true
# Initial volume (0-65536)
initialVolume = 65536
# Whether librespot-java should ignore volume events, sink volume is set to the max
bypassSinkVolume = false
# Release mixer line after set delay (in seconds)
releaseLineDelay = 20
# Normalisation pregain in decibels (loud at +6, normal at +3, quiet at -5)
normalisationPregain = 0.0
# Output metadata in Shairport Sync format (https://github.com/mikebrady/shairport-sync-metadata-reader)
metadataPipe = ""
# Autoplay similar songs when your music ends
autoplayEnabled = true
# Preferred audio quality (NORMAL, HIGH, VERY_HIGH)
preferredAudioQuality = "VORBIS_320"
# Where librespot-java should search for local files
localFilesPath = ""
# Audio output device (MIXER, PIPE, STDOUT, CUSTOM)
output = "PIPE"
# Crossfade overlap time (in milliseconds)
crossfadeDuration = 0
# Audio output Java class name
outputClass = ""
# Whether the player should retry fetching a chuck if it fails
retryOnChunkError = true
# Mixer/backend search keywords (semicolon separated)
mixerSearchKeywords = ""
# Output raw (signed) PCM to this file (`player.output` must be PIPE)
pipe = "/tmp/snapfifo"
# Log available mixers
logAvailableMixers = true
# Number of volume notches
volumeSteps = 64
基本的に編集してもらうところには【】をつけています。
しかしUbuntuだとなぜかなりませんでした。
ということでcat /dev/urandom > /tmp/snapfifoとしてみるとpermission deniedとでたので所有権がらみで音が出てないみたいでした。
てことでsudo chmod -t /tmpとしたら上手くいきました。