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- 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
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+ PSRAM
- 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)
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response)
- 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).
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- 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 & 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)
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- Fix WiFi init order: netif creation before esp_wifi_init, set mode before set_config
- Replace broken netif input filter with NAPT on/off per authentication state
- NAPT disabled by default, enabled when client granted, disabled on revoke
- Fix test helpers: use -I wlp59s0 for ping, handle nslookup exit code 1
- All 20 API tests pass, all 6 smoke tests pass
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