docs(who-4): document #4#INTERFACE routing and actuator status boundaries

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functional/who-4-temperature-control/addressing.md

@@ -59,3 +59,26 @@ For the four-zone case where probe and central share an address, the source desc
 See [Temperature Control evidence](../../project/review/myopencommunity-integration.md#temperature-control).
 
 See [`WHAT` Reference](what.md) for central-unit commands, [`DIMENSION` Reference](dimensions.md) for operation-specific payloads, and [Addressing](../../protocol/addressing.md) for the common system-scoped addressing model.
+
+## Gateway firmware routing and actuator-request boundaries
+
+**Local-bus `#4#INTERFACE` qualification.** In the pinned `own-firmware-oracle` `thermo-zone-requests` v3 suite at revision `de87a34e251b677a299917c98fcfcea3b409bf34` (`oracle_version=3`, full simulated-PIC harness, `reset=each` on `F450 020010` and `reset=0` on the other 11 targets, declared `settle_ms=3000`), none of the 12 emulated gateway Firmwares emits an interface-routed `$06EC` or `$06E4` SCS bus telegram on any of the nine `#4#INTERFACE`-qualified `WHO 4` status or dimension requests (`*#4*2#4#01##`, `*#4*2#4#12##`, `*#4*2#4#01*0##`, `*#4*2#4#01*11##`, `*#4*2#4#01*19##`, `*#4*2#4#01*20##`, `*#4*2#4#12*20##`, `*#4*2#1#4#01*20##`, `*#4*2#4#01*60##`):
+
+| Gateway model | Firmware | `#4#INTERFACE` `WHO 4` request behavior | Dimensionless `*#4*2#1##` behavior | Original result |
+| --- | --- | --- | --- | --- |
+| F450 | `020010` | Truncates `*20` at `#` to local zone `2` (`$04A9023010`, `NACK` / `out`); `NACK` / `silent` on others | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/F450/020010/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| F453 | `010100` | `NACK` / `silent` on all nine `#4#INTERFACE` requests | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/F453/010100/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| F453AV | `030014` | `NACK` / `silent` on all nine `#4#INTERFACE` requests | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/F453AV/030014/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| F454 | `020051` | Truncates `*20` at `#` to local zone `2` (`$04A9023010`, `NACK` / `out`); `NACK` / `silent` on others | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/F454/020051/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| F459 | `020105` | Truncates `*20` and `*60` at `#` to local zone `2`; `NACK` / `silent` on others | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/F459/020105/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| F460 | `020012` | Truncates `*20` and `*60` at `#` to local zone `2`; `NACK` / `silent` on others | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/F460/020012/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| F461 | `020011` | Truncates `*20` and `*60` at `#` to local zone `2`; `NACK` / `silent` on others | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/F461/020011/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| H4684 | `020054` | Truncates status, `*0`, and `*19` at `#` to local zone `2`; `NACK` / `silent` on others | Truncates at `#` to local zone `2` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/H4684/020054/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| MH200 | `020102` | Truncates status, `*0`, and `*19` at `#` to local zone `2`; `NACK` / `silent` on others | Truncates at `#` to local zone `2` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/MH200/020102/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| MH200N | `010108` | `NACK` / `silent` on all nine `#4#INTERFACE` requests | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/MH200N/010108/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| MH202 | `010024` | Parses trailing `#4#01` on `*20` as local `Z=4, N=1` (`$0499843110`); `crash` on `*#4*2#4#01##`; `NACK` / `silent` on `#4#12` and others | `NACK` / `crash` (`coso` daemon exit) | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/MH202/010024/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+| MyHomeServer1 | `028206` | Truncates `*20` and `*60` at `#` to local zone `2`; `NACK` / `silent` on others | `NACK` / `silent` | [Pinned result](https://github.com/OpenWebNet-HA/own-firmware-oracle/blob/de87a34e251b677a299917c98fcfcea3b409bf34/results/MyHomeServer1/028206/oracle/full/thermo-zone-requests.tsv#L21-L32) |
+
+Recorded `out` verdicts on `#4#INTERFACE`-qualified `WHO 4` requests must therefore not be interpreted as local-bus interface forwarding: on `F450`, `F454`, `F459`, `F460`, `F461`, `H4684`, `MH200`, and `MyHomeServer1`, the recorded SCS bus bytes query local main-bus zone `2`, while on `MH202` Firmware `010024` both `*#4*2#4#01*20##` and `*#4*2#1#4#01*20##` read the trailing `#4` and `#01` tokens as local zone `4` actuator `1` (`$0499843110`) and reject `*#4*2#4#12*20##` (`NACK` / `silent`). Clients should withhold outbound `#4#INTERFACE`-qualified `WHO 4` status and dimension polls unless gateway support is explicitly established, while continuing to parse `#4#INTERFACE`-qualified `WHO 4` event frames received from the bus.
+
+**Dimensionless actuator status requests.** Dimensionless `*#4*Z#N##` status requests are not supported across the 12 inspected Firmwares: nine return `NACK` with `silent`, `H4684` Firmware `020054` and `MH200` Firmware `020102` truncate `2#1` at `#` to poll local zone `2`, and `MH202` Firmware `010024` terminates its `coso` translator process (`reply=nack`, `verdict=crash`) on both `*#4*2#1##` and misparsed `*#4*2#4#01##` (while rejecting `*#4*2#4#12##` with `NACK` / `silent`). Clients querying actuator state must request `DIMENSION 20` (`*#4*Z#N*20##` or `*#4*#0*20##`; zone-level `*#4*Z*20##` is dropped on six of the 12 inspected Firmwares) rather than sending dimensionless `*#4*Z#N##`. These observations come from inspected emulator artifacts and do not establish physical SCS bus behavior or uninspected Firmware versions; see [WHO 4 gateway routing and actuator-request review](../../project/review/who4-gateway-routing-and-actuator-requests.md).