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<title>npub12m5exm2uk3xa674cc5r0hlyvccs5xxn7qv83ezuteefv5972nquq4j4szl/esp32-tollgate/main/tollgate_api.c, branch feature/cvm-integration</title>
<subtitle>[no description]</subtitle>
<id>https://upleb.uk/npub12m5exm2uk3xa674cc5r0hlyvccs5xxn7qv83ezuteefv5972nquq4j4szl/esp32-tollgate/atom?h=feature%2Fcvm-integration</id>
<link rel='self' href='https://upleb.uk/npub12m5exm2uk3xa674cc5r0hlyvccs5xxn7qv83ezuteefv5972nquq4j4szl/esp32-tollgate/atom?h=feature%2Fcvm-integration'/>
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<updated>2026-05-17T11:09:31+00:00</updated>
<entry>
<title>feat: per-client NAT filtering via LWIP_HOOK_IP4_CANFORWARD</title>
<updated>2026-05-17T11:09:31+00:00</updated>
<author>
<name>Your Name</name>
<email>you@example.com</email>
</author>
<published>2026-05-17T11:09:31+00:00</published>
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<id>urn:sha1:0c2c67b463d6a90aaa0bb69bf3c91dba1d9ec3ec</id>
<content type='text'>
- Add lwip_tollgate_hooks.h defining LWIP_HOOK_IP4_CANFORWARD macro
- Inject hook into lwIP build via CMakeLists.txt ESP_IDF_LWIP_HOOK_FILENAME
- Filter forwarded packets by source IP against firewall allowed list
- Only filter packets from AP subnet (10.192.45.0/24), allow all others
- Fix byte order bug: use network byte order for firewall_is_client_allowed
- NAT always enabled, removed global NAT toggle functions
- Remove spent-secret tracking from session.c (mint is authority)
- Remove unused get_ap_netif() function
- Reduce API server stack from 32KB to 16KB (fixes ESP_ERR_HTTPD_TASK)
- Add esp_random.h stub for unit tests
- All 186 unit tests passing
- Verified on hardware: block-&gt;pay-&gt;allow-&gt;revoke-&gt;block E2E works
</content>
</entry>
<entry>
<title>feat(phase6): bytes-based billing - dual metric support</title>
<updated>2026-05-16T23:20:07+00:00</updated>
<author>
<name>Your Name</name>
<email>you@example.com</email>
</author>
<published>2026-05-16T23:20:07+00:00</published>
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<id>urn:sha1:edd125d0e3fe5fe7c0edf30c429723f3b0120c68</id>
<content type='text'>
- session_create_bytes() + session_add_bytes() for bytes-metric sessions
- session_is_expired() dispatches on config metric (bytes vs milliseconds)
- cashu_calculate_allotment() unified dispatcher for both metrics
- tollgate_api discovery/usage/session_event use configured metric
- config: metric field defaults to 'bytes', step_size_bytes=22020096 (21MB)
- 14 new unit tests (148 total passing)
- ASSERT_EQ_UINT64 macro added to test framework
</content>
</entry>
<entry>
<title>Phase 3: Nostr identity derivation + wifistr service discovery</title>
<updated>2026-05-16T18:25:05+00:00</updated>
<author>
<name>Your Name</name>
<email>you@example.com</email>
</author>
<published>2026-05-16T18:25:05+00:00</published>
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<id>urn:sha1:4c47ae188b288e7d24bd9566ab3e6a6805d9484f</id>
<content type='text'>
- Add identity.c/h: HMAC-SHA512 derivation from nsec → npub, STA/AP MAC, SSID, AP IP
- Add nostr_event.c/h: NIP-01 event serialization + Schnorr signing (BIP-340)
- Add geohash.c/h: lat/lon to geohash encoding
- Add wifistr.c/h: kind 38787 event builder + WebSocket publish to Nostr relays
- Update config.c/h: nsec-based identity, Nostr relay/geo config, remove static SSID/IP
- Replace custom mbedTLS wallet with nucula library (libsecp256k1)
- Remove wallet.c/h, wallet_persist.c/h (replaced by nucula_lib component)
- Verified on Board A: derived SSID, captive portal, payment, wallet, wifistr publish
</content>
</entry>
<entry>
<title>Phase 3: on-device Cashu wallet with mbedTLS secp256k1 + SPIFFS persistence + PSRAM</title>
<updated>2026-05-16T10:02:55+00:00</updated>
<author>
<name>Your Name</name>
<email>you@example.com</email>
</author>
<published>2026-05-16T10:02:55+00:00</published>
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<id>urn:sha1:133e40c82afb4d7659758b1fa57925ac57af4621</id>
<content type='text'>
- wallet.c/h: secp256k1 ECP primitives (hash_to_curve, scalar_mul, point_add)
- wallet_persist.c/h: SPIFFS persistence with threshold-based write protection
- Fee accounting for swap (input_fee_ppk from /v1/keysets)
- Keyset fetch via /v1/keysets (586 bytes vs 21KB for /v1/keys)
- Wallet API: GET /wallet, POST /wallet/swap, POST /wallet/send
- Payment proofs auto-stored to wallet + persisted on SPIFFS
- PSRAM enabled for large allocations (ESP32-S3 has 8MB)
- Wallet init deferred to dedicated task (avoids sys_evt stack overflow)
- Cashu proof ID buffer size fixed (66 hex chars, not 16)
- HTTP client: added fetch_headers() call for proper response handling
- persist_threshold_sats config parameter (default: 1 sat)
</content>
</entry>
<entry>
<title>Captive portal detection fix + Phase 2 tests 16-18,20 passing (17/17)</title>
<updated>2026-05-15T23:16:32+00:00</updated>
<author>
<name>Your Name</name>
<email>you@example.com</email>
</author>
<published>2026-05-15T23:16:32+00:00</published>
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<id>urn:sha1:50b5975ac8793d6d820c35b5999f8a909f64e71b</id>
<content type='text'>
- Add DoT reject server on port 853 (TCP RST forces DNS-over-TLS fallback)
- DNS hijack returns NXDOMAIN for all non-A query types (no forwarding for unauthed)
- Shorter TTL on hijack responses (10s) for faster captive detection
- Explicit 302 redirect handlers for /generate_204, /hotspot-detect.html, etc.
- HTTP and DNS request logging for debugging captive detection
- Per-MAC tracking in firewall (find_by_mac, get_mac_for_ip with ARP fallback)
- Session MAC tracking (session_find_by_mac)
- Phase 2 test 18: add route through TollGate before ping test
- All 17 Phase 2 tests pass (15-21 + whoami + portal form)
</content>
</entry>
<entry>
<title>Phase 2 WIP: token decode works, TLS checkstate succeeds (crashes after response)</title>
<updated>2026-05-15T22:07:20+00:00</updated>
<author>
<name>Your Name</name>
<email>you@example.com</email>
</author>
<published>2026-05-15T22:07:20+00:00</published>
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<id>urn:sha1:c342801162e62ff017ead18688107397d229f606</id>
<content type='text'>
- cashu.c: dynamic json_buf sizing (was 2048 stack, now heap based on token length)
- cashu.c: strip trailing newline/CR from token input (cashu CLI appends 'Balance: 0 sat')
- cashu.c: esp_crt_bundle_attach for HTTPS to mint API
- cashu.c: esp_http_client_open/write/fetch_headers/read pattern for HTTPS POST
- cashu.c: remove debug b64url_decode logging
- tollgate_api.c: loop httpd_req_recv for full body (was single call, missed TCP segments)
- tollgate_api.c: stack_size=32768 for TLS in httpd handler
- config.c: fix default mint URL from nofee.testnut to testnut.cashu.space
- CMakeLists.txt: add esp-tls dependency for cert bundle
- CHECKLIST.md: updated with infrastructure status and TDD plan

Known issue: device reboots after checkstate returns 966 bytes with status=200.
Crash likely in post-response processing (JSON parse or session create).
</content>
</entry>
<entry>
<title>Fix stack overflow and heap-allocate large buffers in Cashu/payment path</title>
<updated>2026-05-15T17:35:46+00:00</updated>
<author>
<name>Your Name</name>
<email>you@example.com</email>
</author>
<published>2026-05-15T17:35:46+00:00</published>
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<id>urn:sha1:aed51d824f598f7315282936037c4d5b6e7fb4b8</id>
<content type='text'>
- tollgate_api.c: increase httpd stack_size to 16384 (was default 4096)
- cashu.c: heap-allocate b64, json_buf, post_body, resp_buf instead of stack
- cashu.c: proper free() on all error paths
- Makefile: replace Go-based tokens target with nutshell wallet targets
- Makefile: add wallet-setup, wallet-info, wallet-balance, mint-token, send-token
</content>
</entry>
<entry>
<title>Phase 2 WIP: Cashu payment endpoints, session tracking, updated checklist</title>
<updated>2026-05-15T16:57:14+00:00</updated>
<author>
<name>Your Name</name>
<email>you@example.com</email>
</author>
<published>2026-05-15T16:57:14+00:00</published>
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<id>urn:sha1:1263d86314fc0760d9be8eea415ccecbc047a5eb</id>
<content type='text'>
- Add cashu.c/h: Cashu token decode (cashuA/base64url), proof state check via mint API, allotment calculator
- Add session.c/h: time-based session management with allotment/expiry, spent secret tracking
- Add tollgate_api.c/h: HTTP server on :2121 with GET / (kind=10021 discovery), POST / (payment processing), /usage, /whoami
- Update captive portal HTML: replace Grant Free Access with Cashu token paste form + Pay &amp; Connect button
- Update tollgate_main.c: wire in session manager, TollGate API, 1s session tick loop
- Add tests/phase2.mjs: Phase 2 test suite (discovery, invalid token, wrong mint, valid payment)
- Update CHECKLIST.md: reflect Phase 1 complete, Phase 2 in progress with known bugs

Known issues (not yet flashed):
- Stack overflow crash in httpd POST handler (need stack_size=16384 + heap allocations)
- cashu_decode_token uses 2KB stack buffer (needs heap alloc)
- Mint URL should be testnut.cashu.space (nofee.testnut has API compat issues)
</content>
</entry>
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