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schemas/fsssignaldiscovered README: Reworked for changed schema
* Purely event-based batching, no timer. * Outline Horizons/Odyssey differences. * Point out that USS are manually scanned, so different in time nature. * StarSystem renamed from systemName. * StarSystem and StarPos now mandatory.
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Athanasius
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@ -8,27 +8,66 @@ Please consult [EDDN Schemas README](./README-EDDN-schemas.md) for general
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documentation for a schema such as this.
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## Senders
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The primary data source for this schema is the ED Journal event
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The only data source for this schema is the ED Journal event
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`FSSSignalDiscovered`.
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### Batching
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You MUST put several `FSSSignalDiscovered` events to an array `signals` which is key of `message`. Minimum size of
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`signals` is 1 item.
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You MUST coalesce contiguouys runs of `FSSSignalDiscovered` events into a
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single `signals` array in the message. Minimum size of `signals` is 1 item.
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Do not make a request for every single event.
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Do not make a request for every single event other than where they occur
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singly (such as when a player utilises the FSS to zoom into USS individually).
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Possible algorithm of batching:
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1. If the event is FSSSignalDiscovered, store it to the temporal list and proceed to next event.
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2. If the next event is also FSSSignalDiscovered, repeat 1.
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3. If the next event is any other or there is no other event for more than 10 seconds, send the
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temporal list in a single message to EDDN.
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Suggested algorithm for batching:
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1. You will need to track the current location from `Location`, `FSDJump` and
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`CarrierJump` events. This is in order to add the top-level augmentation
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of `StarSystem` (system name) and `StarPos`. You will need to record:
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1. `SystemAddress` - for cross-checking.
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2. `StarSystem` - name of the star system.
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3. `StarPos` - the galactic co-ordinates of the system.
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2. If the event is `FSSSignalDiscovered`, store it to the temporal list.
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3. If the event is any other, then:
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1. check if it is `Location`, `FSDJump` or `CarrierJump` - if so you should
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use this new location in the message.
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2. If it is not one of those events then you should use the tracked
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location from the prior such event.
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Now construct the full `fsssignaldiscovered` schema message using the
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tracked location and the stored list of events. *You **MUST** check that
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the `SystemAddress` for each `FSSSignalDiscovered` event matches the
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tracked location.* If there is a mis-match then drop that event.
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4. Each batch of signals will be contiguous and thus should have the same
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timestamp, perhaps +/- 1 second at the ends. As such you only need one
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single `timestamp` in the `message` and should use that of the first event
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you include.
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Point 3i/ii above are because in the current (3.8.0.406) Horizons client the
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`FSSSignalDiscovered` events arrive after `Location`/`FSDJump`/`CarrierJump`,
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but in the current (4.0.0.1302) Odyssey client they arrive before such events.
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Thus, in Horizons you use the last-tracked location, but in Odyssey you use
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the "just arrived" location.
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Manually FSS-scanned USS type signals will come in one by one, possibly with
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other events between them (such as `Music` due to zooming in/out in FSS).
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There is no need to attempt batching these together if separated by other
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events, even though you'll be using the `timestamp` of the first on the
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message, despite the actual time-line being dependent on how quickly the
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player scans them.
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This batching is more concerned with not causing an EDDN message per event
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upon entry into a system.
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### Elisions
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You MUST remove the following key/value pairs from the data:
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- `TimeRemaining` key/value pair.
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- `TimeRemaining` key/value pair (will be present on USS). This has a slight
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PII nature and is also very ephemeral.
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You MUST refuse to send the whole `FSSSignalDiscovered` event if `USSType` key has `$USS_Type_MissionTarget;` value.
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You MUST drop the whole `FSSSignalDiscovered` event if `USSType` key
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has `$USS_Type_MissionTarget;` value. Only the Cmdr with the mission has any
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use of these. There's not even a statistical use.
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### Augmentations
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#### horizons flag
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@ -37,42 +76,56 @@ You SHOULD add this key/value pair, using the value from the `LoadGame` event.
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#### odyssey flag
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You SHOULD add this key/value pair, using the value from the `LoadGame` event.
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#### systemName
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You SHOULD add a `systemName` string containing the system name from the last `FSDJump`, `CarrierJump`, or `Location`
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event There exists problem when you gets `FSSSignalDiscovered` before
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`FSDJump`, `CarrierJump`, or `Location` event, so you MUST cross-check it with `SystemAddress` or don't include at all.
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#### StarSystem
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You **MUST** add a `StarSystem` string containing the system name from the last
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tracked location. You **MUST** cross-check each `FSSSignalDiscovered`
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->`SystemAddress` value to ensure it matches. If it does not, you **MUST**
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drop the event.
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#### StarPos
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You SHOULD add a `StarPos` array containing the system co-ordinates from the
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last `FSDJump`, `CarrierJump`, or `Location` event. There exists problem when you gets `FSSSignalDiscovered` before
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`FSDJump`, `CarrierJump`, or `Location` event, so you MUST cross-check it with `SystemAddress` or don't include at all.
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You **MUST** add a `StarPos` array containing the system co-ordinates from the
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tracked location. You **MUST** cross-check each `FSSSignalDiscovered`
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->`SystemAddress` value to ensure it matches. If it does not, you **MUST**
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drop the event.
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## Receivers
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Receivers should remember: `horizons`, `odyssey`, `systemName`, `StarPos` are optional key/value pairs, it means you
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should not rely on it will appear in every EDDN event.
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### Augmentations are 'SHOULD', not 'MUST'
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Receivers should remember that `horizons`, `odyssey`, `StarSystem`, `StarPos`
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are optional key/value pairs. You **SHOULD NOT** rely on them being present
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in any given event.
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### Duplicate messages from 'busy' systems
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When a system is particularly full of signals, such as when many Fleet Carriers
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are present, it has been observed that the game repeats the identical
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sequence of `FSSSignalDiscovered` events. So you might receive what looks like
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a duplicate message, other than the timestamp (if the timestamp is the same
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then the EDDN Relay should drop the duplicate).
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## Examples
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This is a few example of messages that passes current `FSSSignalDiscovered` schema.
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1. A message without `horizons`, `odyssey`, `systemName`, `StarPos` fields.
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1. A message without `horizons` or `odyssey` augmentations.
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```json
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{
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"$schemaRef":"https://eddn.edcd.io/schemas/fsssignaldiscovered/1",
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"header":{
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"gatewayTimestamp":"2021-11-06T22:48:43.483147Z",
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"softwareName":"an software",
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"softwareName":"a software",
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"softwareVersion":"a version",
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"uploaderID":"an uploader"
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},
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"message":{
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"timestamp":"2021-11-06T22:48:42Z",
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"event":"FSSSignalDiscovered",
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"SystemAddress":1774711381,
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"signals":[
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{
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"timestamp":"2021-07-30T19:03:08Z",
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"event":"FSSSignalDiscovered",
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"SystemAddress":1774711381,
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"SignalName":"EXPLORER-CLASS X2X-74M",
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"IsStation":true
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}
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],
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"StarSystem":"HR 1185",
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"StarPos": [
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-64.66, -148.94, -330.41
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]
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}
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}
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@ -84,24 +137,22 @@ This is a few example of messages that passes current `FSSSignalDiscovered` sche
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"$schemaRef":"https://eddn.edcd.io/schemas/fsssignaldiscovered/1",
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"header":{
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"gatewayTimestamp":"2021-11-06T22:48:43.483147Z",
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"softwareName":"an software",
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"softwareName":"a software",
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"softwareVersion":"a version",
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"uploaderID":"an uploader"
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},
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"message":{
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"timestamp":"2021-11-06T22:48:42Z",
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"event":"FSSSignalDiscovered",
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"SystemAddress":1350507186531,
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"signals":[
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{
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"timestamp":"2021-07-30T19:03:08Z",
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"event":"FSSSignalDiscovered",
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"SystemAddress":1774711381,
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"SignalName":"EXPLORER-CLASS X2X-74M",
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"IsStation":true
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},
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{
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"timestamp":"2020-12-31T14:14:01Z",
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"event":"FSSSignalDiscovered",
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"SystemAddress":216054883492,
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"SignalName":"$USS_NonHumanSignalSource;",
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"USSType":"$USS_Type_NonHuman;",
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"SpawningState":"$FactionState_None;",
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@ -109,14 +160,14 @@ This is a few example of messages that passes current `FSSSignalDiscovered` sche
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"ThreatLevel":5
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}
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],
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"StarPos": [
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"StarPos": [
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8.1875,
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124.21875,
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-38.5
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],
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"StarSystem": "HIP 56186",
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"horizons": true,
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"odyssey": true
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],
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"StarSystem": "HIP 56186",
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"horizons": true,
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"odyssey": true
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}
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}
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```
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