Ports - Rockbox Zig

Service	Port	Protocol	Override
gRPC	6061	gRPC / gRPC-Web	`ROCKBOX_RPC_PORT`
GraphQL + Web UI	6062	HTTP / WS	`ROCKBOX_GRAPHQL_PORT`
HTTP REST	6063	HTTP	`ROCKBOX_TCP_PORT`
MPD server	6600	MPD protocol	`ROCKBOX_MPD_PORT`
Subsonic / Navidrome API	4533	HTTP	`subsonic_port`
Slim Protocol (squeezelite)	3483	TCP	`squeezelite_port`
HTTP PCM stream (squeezelite)	9999	HTTP	`squeezelite_http_port`
Chromecast WAV stream	7881	HTTP	`chromecast_http_port`
UPnP MediaServer (ContentDirectory)	7878	HTTP / SSDP	`upnp_server_port`
UPnP WAV broadcast (PCM sink)	7879	HTTP	`upnp_http_port`
UPnP MediaRenderer (AVTransport)	7880	HTTP / SSDP	`upnp_renderer_port`
Snapcast TCP source (outbound only)	4953	TCP (client)	`snapcast_tcp_port`

mDNS / SSDP service types

Rockbox both advertises and scans for the following on the LAN:

Service	Service type	Direction
Rockbox itself	`_rockbox._tcp.local.`	advertise
Chromecast	`_googlecast._tcp.local.`	scan
AirPlay (RAOP)	`_raop._tcp.local.`	scan
Squeezelite players	`_slim._tcp.local.`	scan
Snapcast servers	`_snapcast._tcp.local.`	scan
UPnP renderers	`urn:schemas-upnp-org:device:MediaRenderer:1`	SSDP scan
UPnP media server (this one)	`urn:schemas-upnp-org:device:MediaServer:1`	SSDP advertise

Firewall checklist

If rockboxd is in a VM, container, or behind a firewall, at minimum inbound on these is needed:

6062/tcp — for the web UI and GraphQL
6063/tcp — for the REST API
6600/tcp — for MPD clients
4533/tcp — for Subsonic/Navidrome clients (Cassette, Symfonium, DSub, …)
5353/udp — mDNS (multicast)
1900/udp — SSDP (multicast)

If you use Chromecast or AirPlay, the receiver must also be able to reach back to rockboxd on 7881/tcp (Chromecast WAV) or 7879/tcp (UPnP WAV).