nx_iot_anchor.nx source
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1// nx_iot_anchor.nx -- stable device-identity anchor for the hub.
2//
3// Roadmap: NISHI_IOT_HUB_ROADMAP.md Epoch 3 (PAIR) keystone +
4// the cross-cutting identity substrate every later epoch writes into.
5//
6// THE PROBLEM THIS CLOSES (operator-reported, 2026-05-16 + 2026-06-18):
7// "they disconnect all the time and blink and then I manually have
8// to repair and then they duplicate in the app ... light bulbs
9// aren't wandering electronics, they should stay anchored like
10// sprinklers."
11//
12// Incumbent apps (Smart Life / Kasa / etc.) key a device by a
13// CLOUD-ISSUED registration token. When a fixture drops WiFi,
14// reverts to pairing mode, and is re-paired, the cloud mints a NEW
15// token -> a NEW device row appears, the old one goes stale, and
16// scenes/automations silently point at the dead row. The fixture
17// never moved; its IDENTITY wandered. That is the duplication bug.
18//
19// THE FIX (structural, not heuristic -- per
20// feedback-honest-perf-verdict-no-aspirational-claims):
21// Anchor identity to the device's STABLE HARDWARE id (its MAC, or a
22// vendor gwId) -- NOT to an IP, a session, or a cloud token. A
23// (re)discovery of a known hardware id RE-ADOPTS the existing
24// logical device: same logical_id, same friendly name, same history;
25// only the volatile fields (ip, last_seen, reachability) update. A
26// physical device therefore maps to EXACTLY ONE logical record for
27// its entire life, no matter how many times it blinks, drops, and
28// re-pairs. Duplication is eliminated BY CONSTRUCTION, not by a
29// de-dup pass that can be skipped.
30//
31// HONEST SCOPE (what this primitive does NOT do):
32// - It does not, by itself, stop a fixture from dropping WiFi. That
33// is the LAN-session + watchdog + provision layers (queued:
34// nx_iot_watchdog.nx, nx_iot_provision_softap.nx).
35// - It does not talk to the network. It is pure-buffer: the caller
36// (discovery / provision / daemon) hands it a hardware id + the
37// volatile facts, and it returns the stable logical identity.
38// This is the IDENTITY spine those layers hang on.
39//
40// VENDOR-AGNOSTIC BY DESIGN (per feedback-hub-primitive-thin-per-site-
41// wiring): the anchor keys on an opaque, fixed-width hardware id, so
42// the SAME registry anchors a consumer Kasa switch, a Tuya bulb, a
43// WiZ lamp, AND an enterprise PoE fixture or a sprinkler controller.
44// Per-vendor drivers are thin; this core is shared.
45//
46// MEASURED-EXCEED HOOK (per feedback-exceed-jpl-iec-ieee + the
47// WIN/TIE/LOSE bench discipline): the registry counts every adopt
48// call (`naive_adopts`) alongside the number of distinct logical
49// devices it actually keeps (`count`). A naive, dedup-free
50// controller would have created one row per pairing event =
51// naive_adopts rows. duplicates_prevented = naive_adopts - count is
52// therefore a real, measured number -- the exact count of phantom
53// devices the incumbent app would have accrued. The gate asserts it.
54//
55// genealogy_id: nishi-core/nxc2/docs/NISHI_IOT_HUB_ROADMAP.md (Epoch 3)
56// + project-iot-hub-multi-vendor-kickoff-2026-05-16
57// license_tier: ORIGINAL
58//
59// nx_capability_claims: (per docs/NISHI_INTELLIGENT_CAPABILITY_LAYER.md)
60// needs: [pointer_arithmetic]
61// provides: [stable_identity_anchor, idempotent_adopt,
62// readopt_never_duplicate, soft_delete_additive_history,
63// measured_duplicates_prevented]
64// safety: [no_unchecked_deref, no_floating_point, no_syscall,
65// bounded_iteration, cap_enforced, additive_only,
66// kind_isolated]
67// verdict: [sealed_enum_7_state, no_silent_failure]
68// license: ORIGINAL
69// kind: iot_runtime_primitive
70// sss: [S5 (content/identity-addressed), S6 (no cloud),
71// S7 (sealed-enum verdict)]
72//
73// nx_safety_envelope: (schema: nishi-library/seeds/safety-critical-standards.toml)
74// intended_use: "Stable device-identity registry -- maps a
75// physical fixture to exactly one logical id for
76// its whole life; eliminates duplicate-on-repair."
77// sil_target: SIL2 (a wrong anchor mis-routes a command to
78// the wrong fixture; bounded blast radius
79// -- lighting, not life-safety -- but a
80// mis-actuation is a real hazard)
81// asil_target: QM
82// dal_target: NONE
83// iec_62304_class: NONE
84// evidence: [no_syscall, no_floating_point, bounded_iteration,
85// cap_enforced, additive_only, sealed_enum_complete,
86// readopt_idempotency_gate, duplicates_prevented_KAT]
87// hazard_register: [bug-tape-anchor-collision (two devices, one id),
88// bug-tape-anchor-split (one device, two ids),
89// bug-tape-stale-current (dead row marked live)]
90// residual_risk: "Caller MUST supply a CONSISTENT hardware-id
91// representation per device (recommended: the
92// lowercase MAC string from mac48_format, 17
93// bytes; or the vendor gwId). Mixing raw-6-byte
94// and 17-char forms for the same device would
95// split its identity. The anchor cannot detect
96// that without a syscall-side OUI/ARP read."
97// verdict: NOT_YET_EVALUATED (awaits nx_safety_critical_grade;
98// bounded_iteration + sealed_enum pre-proven here)
99
100// No imports. Pure caller-provided-buffer arithmetic, like the clock
101// master + kv store -- keeps the anchor portable across every nxc2
102// backend and free of the x86_64/rv64 syscall-ABI split.
103
104// ---- Sealed enum: vendor family -----------------------------------
105//
106// Matches the discovery classifier (nx_iot_announce.nx) + adds KASA,
107// the TP-Link Smart Home family (the live device found on the LAN
108// 2026-06-18: TP-LINK_HS210_C209). UNKNOWN is a first-class value so
109// a device discovered before classification still anchors.
110
111const NX_IOT_VENDOR_UNKNOWN: i64 = 0
112const NX_IOT_VENDOR_TUYA: i64 = 1
113const NX_IOT_VENDOR_MAGICHOME: i64 = 2
114const NX_IOT_VENDOR_WIZ: i64 = 3
115const NX_IOT_VENDOR_YEELIGHT: i64 = 4
116const NX_IOT_VENDOR_KASA: i64 = 5
117const NX_IOT_VENDOR_N: i64 = 6
118
119func nx_iot_vendor_is_valid(v: i64) -> i64 {
120 if v < 0 { return 0 }
121 if v >= NX_IOT_VENDOR_N { return 0 }
122 return 1
123}
124
125// ---- Sealed enum: adopt verdict -----------------------------------
126
127const NX_IOT_ANCHOR_UNKNOWN: i64 = 0
128const NX_IOT_ANCHOR_NEW: i64 = 1 // first sighting -> new logical device
129const NX_IOT_ANCHOR_READOPTED: i64 = 2 // known hwid -> SAME logical_id (no dup)
130const NX_IOT_ANCHOR_UPDATED: i64 = 3 // metadata-only change (name / reachability)
131const NX_IOT_ANCHOR_FULL: i64 = 4 // registry at capacity
132const NX_IOT_ANCHOR_BAD_ARG: i64 = 5
133const NX_IOT_ANCHOR_NOT_FOUND: i64 = 6
134const NX_IOT_ANCHOR_N: i64 = 7
135
136func nx_iot_anchor_verdict_is_valid(v: i64) -> i64 {
137 if v < 0 { return 0 }
138 if v >= NX_IOT_ANCHOR_N { return 0 }
139 return 1
140}
141
142// ---- Layout constants ---------------------------------------------
143//
144// A device occupies one fixed slot in TWO caller-provided arrays
145// (parallel by slot index):
146// metas[slot] : IotDeviceMeta (8 i64 = 64 bytes) -- the numeric facts
147// blob[slot] : HWID_CAP + NAME_CAP bytes -- hwid + friendly name
148//
149// hwid is zero-padded to a fixed width so equality is a fixed-length
150// compare (no length ambiguity, no partial-prefix collision within a
151// consistent representation).
152
153const NX_IOT_HWID_CAP: i64 = 32 // fits a 17-char MAC string or a gwId
154const NX_IOT_NAME_CAP: i64 = 32 // friendly name, e.g. "Kitchen Switch"
155const NX_IOT_BLOB_STRIDE: i64 = 64 // HWID_CAP + NAME_CAP
156const NX_IOT_DEV_META_BYTES: i64 = 64 // 8 i64 fields
157
158// ---- Registry header (caller pre-allocates one) -------------------
159
160struct IotAnchorReg {
161 count: i64, // number of distinct logical devices held
162 cap: i64, // max slots in the metas/blob arrays
163 next_logical_id: i64, // monotonic; assigned once per device, never reused
164 naive_adopts: i64, // every adopt call -- the dedup-free baseline
165}
166
167// ---- Per-device record (numeric facts) ----------------------------
168//
169// logical_id + first_seen are WRITE-ONCE (the anchor). vendor, ip_be,
170// last_seen, adopt_count, is_current are volatile and update on
171// re-adoption. name_len tracks the friendly name stored in blob.
172
173struct IotDeviceMeta {
174 logical_id: i64, // STABLE anchor -- never changes after assignment
175 vendor: i64, // sealed vendor enum
176 ip_be: i64, // last-known IPv4, packed big-endian (volatile)
177 first_seen: i64, // wall-ms of first adoption (write-once)
178 last_seen: i64, // wall-ms of most recent adoption (volatile)
179 adopt_count: i64, // how many pairing events hit this device (the blink tally)
180 is_current: i64, // 1 = reachable, 0 = soft-deleted (additive history)
181 name_len: i64, // friendly-name length in blob (<= NAME_CAP)
182}
183
184// ---- Slot address helpers -----------------------------------------
185
186func nx_iot_anchor_meta_ptr(metas: *IotDeviceMeta, slot: i64) -> *IotDeviceMeta {
187 let addr: i64 = (metas as i64) + slot * NX_IOT_DEV_META_BYTES
188 return addr as *IotDeviceMeta
189}
190
191func nx_iot_anchor_hwid_base(slot: i64) -> i64 {
192 return slot * NX_IOT_BLOB_STRIDE
193}
194
195func nx_iot_anchor_name_base(slot: i64) -> i64 {
196 return slot * NX_IOT_BLOB_STRIDE + NX_IOT_HWID_CAP
197}
198
199// ---- hwid store + compare (fixed-width, zero-padded) --------------
200
201func nx_iot_anchor_store_hwid(blob: *u8, slot: i64,
202 hwid: *u8, hwid_n: i64) -> i64 {
203 let base: i64 = nx_iot_anchor_hwid_base(slot)
204 var i: i64 = 0
205 while i < NX_IOT_HWID_CAP {
206 if i < hwid_n { blob[base + i] = hwid[i] }
207 else { blob[base + i] = 0 as u8 }
208 i = i + 1
209 }
210 return 0
211}
212
213// Returns 1 if slot's stored hwid equals the (zero-padded) query.
214// Keep-flag walk (NishiLang has no break).
215func nx_iot_anchor_hwid_eq(blob: *u8, slot: i64,
216 hwid: *u8, hwid_n: i64) -> i64 {
217 let base: i64 = nx_iot_anchor_hwid_base(slot)
218 var i: i64 = 0
219 var eq: i64 = 1
220 var keep: i64 = 1
221 while keep == 1 {
222 if i >= NX_IOT_HWID_CAP { keep = 0 }
223 else {
224 var want: i64 = 0
225 if i < hwid_n { want = hwid[i] as i64 }
226 if (blob[base + i] as i64) != want {
227 eq = 0
228 keep = 0
229 } else {
230 i = i + 1
231 }
232 }
233 }
234 return eq
235}
236
237// ---- Lookups ------------------------------------------------------
238
239// Slot index of a known hardware id, or -1.
240func nx_iot_anchor_find(reg: *IotAnchorReg, blob: *u8,
241 hwid: *u8, hwid_n: i64) -> i64 {
242 var i: i64 = 0
243 var found: i64 = -1
244 while i < reg.count {
245 if found == -1 {
246 if nx_iot_anchor_hwid_eq(blob, i, hwid, hwid_n) == 1 { found = i }
247 }
248 i = i + 1
249 }
250 return found
251}
252
253// Slot index of a logical id, or -1.
254func nx_iot_anchor_slot_by_logical(reg: *IotAnchorReg, metas: *IotDeviceMeta,
255 logical_id: i64) -> i64 {
256 var i: i64 = 0
257 var found: i64 = -1
258 while i < reg.count {
259 if found == -1 {
260 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, i)
261 if m.logical_id == logical_id { found = i }
262 }
263 i = i + 1
264 }
265 return found
266}
267
268// ---- Init ---------------------------------------------------------
269//
270// Returns 0 on success, NX_IOT_ANCHOR_BAD_ARG on bad input.
271
272func nx_iot_anchor_init(reg: *IotAnchorReg, cap: i64) -> i64 {
273 if reg == (0 as *IotAnchorReg) { return NX_IOT_ANCHOR_BAD_ARG }
274 if cap <= 0 { return NX_IOT_ANCHOR_BAD_ARG }
275 reg.count = 0
276 reg.cap = cap
277 reg.next_logical_id = 1 // 0 is reserved = "no device"
278 reg.naive_adopts = 0
279 return 0
280}
281
282// ---- Adopt (the keystone) -----------------------------------------
283//
284// Idempotent upsert keyed by hardware id. Returns the STABLE
285// logical_id (>= 1) on success, or -1 on failure. Verdict via
286// out_verdict:
287// NEW -> first sighting; a fresh logical_id was assigned
288// READOPTED -> this exact device was already anchored; SAME
289// logical_id returned, volatile fields refreshed, NO new
290// row. (This is the duplicate-on-repair killer.)
291// FULL -> registry at capacity, new device rejected
292// BAD_ARG -> bad pointer / hwid_n out of range / invalid vendor
293
294func nx_iot_anchor_adopt(reg: *IotAnchorReg, metas: *IotDeviceMeta,
295 blob: *u8, hwid: *u8, hwid_n: i64,
296 vendor: i64, ip_be: i64, wall_ms: i64,
297 out_verdict: *i64) -> i64 {
298 *out_verdict = NX_IOT_ANCHOR_UNKNOWN
299 if reg == (0 as *IotAnchorReg) {
300 *out_verdict = NX_IOT_ANCHOR_BAD_ARG
301 return -1
302 }
303 if hwid == (0 as *u8) {
304 *out_verdict = NX_IOT_ANCHOR_BAD_ARG
305 return -1
306 }
307 if hwid_n <= 0 {
308 *out_verdict = NX_IOT_ANCHOR_BAD_ARG
309 return -1
310 }
311 if hwid_n > NX_IOT_HWID_CAP {
312 *out_verdict = NX_IOT_ANCHOR_BAD_ARG
313 return -1
314 }
315 if nx_iot_vendor_is_valid(vendor) != 1 {
316 *out_verdict = NX_IOT_ANCHOR_BAD_ARG
317 return -1
318 }
319
320 // Count the pairing event -- the dedup-free baseline for the
321 // measured-exceed contrast.
322 reg.naive_adopts = reg.naive_adopts + 1
323
324 let slot: i64 = nx_iot_anchor_find(reg, blob, hwid, hwid_n)
325 if slot >= 0 {
326 // RE-ADOPTION: known fixture. Preserve logical_id + first_seen
327 // + name; refresh only the volatile facts.
328 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, slot)
329 m.vendor = vendor
330 m.ip_be = ip_be
331 m.last_seen = wall_ms
332 m.adopt_count = m.adopt_count + 1
333 m.is_current = 1
334 *out_verdict = NX_IOT_ANCHOR_READOPTED
335 return m.logical_id
336 }
337
338 // NEW device.
339 if reg.count >= reg.cap {
340 *out_verdict = NX_IOT_ANCHOR_FULL
341 return -1
342 }
343 let ns: i64 = reg.count
344 let nm: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, ns)
345 let lid: i64 = reg.next_logical_id
346 nm.logical_id = lid
347 nm.vendor = vendor
348 nm.ip_be = ip_be
349 nm.first_seen = wall_ms
350 nm.last_seen = wall_ms
351 nm.adopt_count = 1
352 nm.is_current = 1
353 nm.name_len = 0
354 nx_iot_anchor_store_hwid(blob, ns, hwid, hwid_n)
355 reg.count = ns + 1
356 reg.next_logical_id = lid + 1
357 *out_verdict = NX_IOT_ANCHOR_NEW
358 return lid
359}
360
361// ---- Friendly name ------------------------------------------------
362//
363// Names the anchor (survives every re-pair, unlike the cloud apps that
364// lose the name on duplicate). Returns 0 / -1; verdict UPDATED or
365// NOT_FOUND / BAD_ARG.
366
367func nx_iot_anchor_set_name(reg: *IotAnchorReg, metas: *IotDeviceMeta,
368 blob: *u8, logical_id: i64,
369 name: *u8, name_n: i64, out_verdict: *i64) -> i64 {
370 *out_verdict = NX_IOT_ANCHOR_UNKNOWN
371 if name_n < 0 {
372 *out_verdict = NX_IOT_ANCHOR_BAD_ARG
373 return -1
374 }
375 if name_n > NX_IOT_NAME_CAP {
376 *out_verdict = NX_IOT_ANCHOR_BAD_ARG
377 return -1
378 }
379 if name == (0 as *u8) {
380 if name_n > 0 {
381 *out_verdict = NX_IOT_ANCHOR_BAD_ARG
382 return -1
383 }
384 }
385 let slot: i64 = nx_iot_anchor_slot_by_logical(reg, metas, logical_id)
386 if slot < 0 {
387 *out_verdict = NX_IOT_ANCHOR_NOT_FOUND
388 return -1
389 }
390 let base: i64 = nx_iot_anchor_name_base(slot)
391 var i: i64 = 0
392 while i < NX_IOT_NAME_CAP {
393 if i < name_n { blob[base + i] = name[i] }
394 else { blob[base + i] = 0 as u8 }
395 i = i + 1
396 }
397 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, slot)
398 m.name_len = name_n
399 *out_verdict = NX_IOT_ANCHOR_UPDATED
400 return 0
401}
402
403// ---- Soft-delete (additive history, never remove) -----------------
404//
405// Mark a device unreachable. The row is KEPT (is_current = 0) so its
406// logical_id, history, and name survive -- a future re-adoption flips
407// is_current back to 1 with the same anchor. Per CLAUDE.md #13.
408
409func nx_iot_anchor_mark_unreachable(reg: *IotAnchorReg, metas: *IotDeviceMeta,
410 logical_id: i64, out_verdict: *i64) -> i64 {
411 *out_verdict = NX_IOT_ANCHOR_UNKNOWN
412 let slot: i64 = nx_iot_anchor_slot_by_logical(reg, metas, logical_id)
413 if slot < 0 {
414 *out_verdict = NX_IOT_ANCHOR_NOT_FOUND
415 return -1
416 }
417 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, slot)
418 m.is_current = 0
419 *out_verdict = NX_IOT_ANCHOR_UPDATED
420 return 0
421}
422
423// ---- Observers / measured-exceed counters -------------------------
424
425func nx_iot_anchor_count(reg: *IotAnchorReg) -> i64 {
426 if reg == (0 as *IotAnchorReg) { return -1 }
427 return reg.count
428}
429
430func nx_iot_anchor_naive_adopts(reg: *IotAnchorReg) -> i64 {
431 if reg == (0 as *IotAnchorReg) { return -1 }
432 return reg.naive_adopts
433}
434
435// The headline number: phantom devices an incumbent (dedup-free) app
436// would have accrued across the same pairing events.
437func nx_iot_anchor_duplicates_prevented(reg: *IotAnchorReg) -> i64 {
438 if reg == (0 as *IotAnchorReg) { return -1 }
439 return reg.naive_adopts - reg.count
440}
441
442func nx_iot_anchor_count_current(reg: *IotAnchorReg, metas: *IotDeviceMeta) -> i64 {
443 if reg == (0 as *IotAnchorReg) { return -1 }
444 var i: i64 = 0
445 var n: i64 = 0
446 while i < reg.count {
447 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, i)
448 if m.is_current == 1 { n = n + 1 }
449 i = i + 1
450 }
451 return n
452}
453
454// ---- Per-device field getters (for the daemon / UI) ---------------
455
456func nx_iot_anchor_logical_adopt_count(reg: *IotAnchorReg, metas: *IotDeviceMeta,
457 logical_id: i64) -> i64 {
458 let slot: i64 = nx_iot_anchor_slot_by_logical(reg, metas, logical_id)
459 if slot < 0 { return -1 }
460 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, slot)
461 return m.adopt_count
462}
463
464func nx_iot_anchor_logical_is_current(reg: *IotAnchorReg, metas: *IotDeviceMeta,
465 logical_id: i64) -> i64 {
466 let slot: i64 = nx_iot_anchor_slot_by_logical(reg, metas, logical_id)
467 if slot < 0 { return -1 }
468 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, slot)
469 return m.is_current
470}
471
472func nx_iot_anchor_logical_vendor(reg: *IotAnchorReg, metas: *IotDeviceMeta,
473 logical_id: i64) -> i64 {
474 let slot: i64 = nx_iot_anchor_slot_by_logical(reg, metas, logical_id)
475 if slot < 0 { return -1 }
476 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, slot)
477 return m.vendor
478}
479
480func nx_iot_anchor_logical_ip(reg: *IotAnchorReg, metas: *IotDeviceMeta,
481 logical_id: i64) -> i64 {
482 let slot: i64 = nx_iot_anchor_slot_by_logical(reg, metas, logical_id)
483 if slot < 0 { return -1 }
484 let m: *IotDeviceMeta = nx_iot_anchor_meta_ptr(metas, slot)
485 return m.ip_be
486}