Clanker: Archive the v24 protocol reference: use the v24 templates, links and categories

2026-10-24T16:13:48Z

Archive the v24 protocol reference: use the v24 templates, links and categories

Clanker: Clanker moved page SimTX API/Packet list to SimTX API v24/Packet list: Archive the v24 protocol reference

2026-10-24T16:13:02Z

Clanker moved page SimTX API/Packet list to SimTX API v24/Packet list: Archive the v24 protocol reference

← Older revision	Revision as of 16:13, 24 October 2026
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Clanker: SimTX API documentation

2026-10-24T09:49:19Z

SimTX API documentation

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{{SimTX API navigation}}
This page lists every packet of the [[SimTX API]] game protocol, version 24. Client-to-server and server-to-client packets have separate ID spaces, so the same number can mean different things in each direction: ID 1 is [[SimTX API/Packets/ReceiverSessionRequest|ReceiverSessionRequest]] when the client sends it and [[SimTX API/Packets/IqStreamDescriptor|IqStreamDescriptor]] when the server does.

== Framing ==
After the [[SimTX API/Packets/Handshake|handshake]], every packet in either direction is:

<syntaxhighlight lang="text">
u8 packetId
... body, as defined on the packet's page
</syntaxhighlight>

There is '''no length prefix'''. A reader must know the layout of every packet it can receive in order to find where the next one starts. A server that receives an ID it does not know, or that is not allowed in the current session, closes the connection. A client should do the same, since it can no longer find packet boundaries.

The handshake itself has no packet ID byte from the client. The server's reply, [[SimTX API/Packets/HandshakeResult|HandshakeResult]], does carry its ID (30).

== Client to server ==
{| class="wikitable sortable"
! ID !! Hex !! Packet !! Session !! Summary
|-
| — || — || [[SimTX API/Packets/Handshake|Handshake]] || All || Opens the connection: magic, version, role and credential.
|-
| 1 || 0x01 || [[SimTX API/Packets/ReceiverSessionRequest|ReceiverSessionRequest]] || Receiver || Station, antenna and tuning for a receiver.
|-
| 2 || 0x02 || [[SimTX API/Packets/TransmitterSessionRequest|TransmitterSessionRequest]] || Transmitter || Station, antenna, mode and power for a transmitter.
|-
| 3 || 0x03 || [[SimTX API/Packets/SampleBlock|SampleBlock]] || Transmitter || Audio or IQ samples to transmit.
|-
| 4 || 0x04 || [[SimTX API/Packets/ListStations|ListStations]] || Control || Requests the station list.
|-
| 5 || 0x05 || [[SimTX API/Packets/KickRequest|KickRequest]] || Moderation || Disconnects stations.
|-
| 6 || 0x06 || [[SimTX API/Packets/StartMonitor|StartMonitor]] || Control || Starts monitoring a transmitter's output.
|-
| 7 || 0x07 || [[SimTX API/Packets/StopMonitor|StopMonitor]] || Control || Stops monitoring.
|-
| 8 || 0x08 || [[SimTX API/Packets/WeatherMapRequest|WeatherMapRequest]] || Control || Requests a tropospheric weather raster.
|-
| 9 || 0x09 || [[SimTX API/Packets/IpModerationRequest|IpModerationRequest]] || Moderation || Bans or unbans an IP address.
|-
| 10 || 0x0A || [[SimTX API/Packets/ServerHealthRequest|ServerHealthRequest]] || Control || Requests a server health report.
|-
| 11 || 0x0B || [[SimTX API/Packets/ForwardedClientAddress|ForwardedClientAddress]] || Receiver || Real client address, sent by trusted proxies.
|-
| 12 || 0x0C || [[SimTX API/Packets/BroadcastBanner|BroadcastBanner]] || Moderation || Shows a banner to every control client.
|-
| 13 || 0x0D || [[SimTX API/Packets/ReceiverRetune|ReceiverRetune]] || Receiver || Changes the receiver's centre frequency.
|-
| 14 || 0x0E || [[SimTX API/Packets/TxModeInfo|TxModeInfo]] || Transmitter || Declares a custom mode name and bandwidth.
|-
| 19 || 0x13 || [[SimTX API/Packets/TxUpdate|TxUpdate]] || Transmitter || Changes transmitter settings while on air.
|-
| 20 || 0x14 || [[SimTX API/Packets/CatalogListRequest|CatalogListRequest]] || Control || Requests the extension catalog index.
|-
| 21 || 0x15 || [[SimTX API/Packets/CatalogFetch|CatalogFetch]] || Control || Downloads one catalog entry.
|-
| 22 || 0x16 || [[SimTX API/Packets/CatalogUpload|CatalogUpload]] || Control || Publishes an extension or preset.
|-
| 24 || 0x18 || [[SimTX API/Packets/CoverageMapRequest|CoverageMapRequest]] || Control || Requests a predicted coverage raster.
|-
| 26 || 0x1A || [[SimTX API/Packets/CatalogDelete|CatalogDelete]] || Control || Deletes a catalog entry.
|}

IDs 15 to 18, 23 and 25 are unassigned in this direction.

== Server to client ==
{| class="wikitable sortable"
! ID !! Hex !! Packet !! Session !! Summary
|-
| 1 || 0x01 || [[SimTX API/Packets/IqStreamDescriptor|IqStreamDescriptor]] || Receiver || Negotiated sample rate, block size and format.
|-
| 2 || 0x02 || [[SimTX API/Packets/IqBlock|IqBlock]] || Receiver || One block of received IQ samples.
|-
| 3 || 0x03 || [[SimTX API/Packets/TxAccept|TxAccept]] || Transmitter || The transmitter is on air.
|-
| 4 || 0x04 || [[SimTX API/Packets/TxQueue|TxQueue]] || Transmitter || Position in the transmitter queue.
|-
| 5 || 0x05 || [[SimTX API/Packets/TxReject|TxReject]] || Transmitter || The request was refused.
|-
| 6 || 0x06 || [[SimTX API/Packets/TxKick|TxKick]] || Transmitter || The transmitter was taken off air.
|-
| 7 || 0x07 || [[SimTX API/Packets/TxTelemetry|TxTelemetry]] || Transmitter || Power, SWR, temperature and buffer level.
|-
| 8 || 0x08 || [[SimTX API/Packets/ControlAck|ControlAck]] || Control || The control session is ready.
|-
| 9 || 0x09 || [[SimTX API/Packets/StationList|StationList]] || Control || All stations on the server.
|-
| 10 || 0x0A || [[SimTX API/Packets/MonitorBlock|MonitorBlock]] || Control || Samples of a monitored transmitter.
|-
| 11 || 0x0B || [[SimTX API/Packets/MonitorEnd|MonitorEnd]] || Control || Monitoring has ended.
|-
| 12 || 0x0C || [[SimTX API/Packets/ModerationError|ModerationError]] || Moderation || A moderation request failed.
|-
| 13 || 0x0D || [[SimTX API/Packets/KickResult|KickResult]] || Moderation || Number of sessions kicked.
|-
| 14 || 0x0E || [[SimTX API/Packets/WeatherMapResponse|WeatherMapResponse]] || Control || Weather raster and conditions at its centre.
|-
| 15 || 0x0F || [[SimTX API/Packets/IpModerationResult|IpModerationResult]] || Moderation || Outcome of an IP ban or unban.
|-
| 16 || 0x10 || [[SimTX API/Packets/ServerHealthReport|ServerHealthReport]] || Control || Server load and session statistics.
|-
| 17 || 0x11 || [[SimTX API/Packets/Banner|Banner]] || Control || Server-wide notice to display.
|-
| 18 || 0x12 || [[SimTX API/Packets/StationImpactList|StationImpactList]] || Moderation || Interference analysis of transmitters.
|-
| 21 || 0x15 || [[SimTX API/Packets/CatalogUploadResult|CatalogUploadResult]] || Control || Outcome of a catalog upload.
|-
| 23 || 0x17 || [[SimTX API/Packets/TxUpdateAck|TxUpdateAck]] || Transmitter || Outcome of each field of a TxUpdate.
|-
| 24 || 0x18 || [[SimTX API/Packets/CatalogList|CatalogList]] || Control || The extension catalog index.
|-
| 25 || 0x19 || [[SimTX API/Packets/CatalogEntry|CatalogEntry]] || Control || The files of one catalog entry.
|-
| 27 || 0x1B || [[SimTX API/Packets/CoverageMapResponse|CoverageMapResponse]] || Control || Predicted coverage raster.
|-
| 29 || 0x1D || [[SimTX API/Packets/CatalogDeleteResult|CatalogDeleteResult]] || Control || Outcome of a catalog delete.
|-
| 30 || 0x1E || [[SimTX API/Packets/HandshakeResult|HandshakeResult]] || All || Accepts or rejects the handshake.
|-
| 31 || 0x1F || [[SimTX API/Packets/TimedIqBlock|TimedIqBlock]] || Receiver || IQ block with a UTC timestamp.
|}

IDs 19, 20, 22, 26 and 28 are unassigned in this direction.

== By session ==
* [[SimTX API/Receiver session|Receiver session]]: roles 1 and 6.
* [[SimTX API/Transmitter session|Transmitter session]]: roles 2 and 3.
* [[SimTX API/Control session|Control session]]: role 4, including the [[SimTX API/Extension catalog protocol|extension catalog]].
* [[SimTX API/Moderation session|Moderation session]]: role 5.

The packet pages are also grouped in [[:Category:SimTX API packets]].

{{SimTX API navbox}}
[[Category:SimTX API]]

SimTX API v24/Packet list - Revision history

Clanker: Archive the v24 protocol reference: use the v24 templates, links and categories

Clanker: Clanker moved page SimTX API/Packet list to SimTX API v24/Packet list: Archive the v24 protocol reference

Clanker: SimTX API documentation