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- Move CVM server start before mint_health_start (avoids RAM fragmentation)
- Fix NIP-01 subscription: #p tag must be array not string
- Fix read loop: tolerate TLS timeouts, don't disconnect
- Reduce TLS timeout from 15s to 5s for faster event delivery
- Add WS frame logging for debugging
- Sign test events with board's nsec (--sec flag) for owner auth
- Change default CVM relay to nos.lol (forwards ephemeral kind 25910)
- MCP get_config and get_balance roundtrips confirmed working
- Unit tests pass (16/16)
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- Removed standalone TLS worker task (couldn't allocate 16KB internal stack)
- Added wallet receive queue to mint_health task (already has 16KB stack + working TLS)
- health_task processes wallet tokens between probe intervals (1s poll)
- tls_worker_set_queue() registers queue from mint_health_start()
- Fallback to synchronous receive if queue not available
- Added freertos/queue.h and tollgate_api.h stubs for unit tests
- Added BaseType_t/UBaseType_t/TickType_t/pdFALSE to FreeRTOS stub
- Full payment round-trip confirmed: 2 payments → 41 sat balance
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- Remove eager load_keysets() from init_wallet(), load on first use
- Add ensure_keysets() with binary exponential backoff + random jitter
- Guard all wallet operations (receive, send, melt, swap_all) with ensure_keysets()
- Skip checkstate on TLS failure, let wallet swap verify proofs instead
- Pin HTTP server to core 0 (fixes TLS cert verification in checkstate)
- Rewrite nucula http.c to use manual open/write/read (same as working health probe)
- Disable hardware MPI (CONFIG_MBEDTLS_HARDWARE_MPI=n)
- Add http.h stub for unit tests
Known issue: progressive TLS failure after 2-3 connections (PK verify 0x4290),
wallet receive swap fails. Needs deeper mbedTLS/PSRAM investigation.
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AP gateway was set to 0.0.0.0 to prevent routing issues, but this
broke DHCP — clients didn't get a default route through the board.
Now set ap_gw = ap_ip so DHCP advertises the board as gateway,
while the STA default route handles outbound internet traffic.
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- Remove DNS resolve test and unused includes from debug endpoint
- Reduce mint_health probe logging to DEBUG level
- Update default mint URL from testnut.cashu.space to
testnut-nutshell.mints.orangesync.tech in config.c,
tollgate_platform.c, .env, AGENTS.md
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Root cause: mbedtls SSL buffers (16KB) couldn't allocate from fragmented
internal RAM (largest block 8KB). Fix by lowering SPIRAM_MALLOC_ALWAYSINTERNAL
from 16KB to 4KB, allowing SSL buffers to go to PSRAM.
Additional fixes:
- DNS server binds to AP IP only (prevents self-hijacking)
- start_services() moved from esp_timer (2KB stack) to dedicated FreeRTOS
task (16KB stack) — was causing stack overflow with dynamic buffers
- Mint health probe now logs errors and exposes last_err in API
- Debug endpoint shows internal/PSRAM heap breakdown and DNS resolve test
- Enabled CONFIG_MBEDTLS_DYNAMIC_BUFFER for better memory management
- Board C config: mint_url → testnut-nutshell.mints.orangesync.tech
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Root cause: xTaskCreate from within IP event handler never scheduled the
services_start_task on ESP32-S3. Replaced with esp_timer one-shot callback.
Also moved captive_portal_start() into start_ap_services() so the portal
starts immediately when the AP comes up, not waiting for STA GOT IP.
Added /debug endpoint for runtime diagnostics.
Added captive_portal diagnostic getters.
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- Update display_update() call to match new signature (7 args)
- Add tollgate_config_add_wifi() implementation for WiFi setup UI
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Squash-merge of feature/display-fix (27 commits):
- AXS15231B touch driver with coordinate parsing (touch.c/h)
- On-screen keyboard with layout/hit detection (keyboard.c/h)
- WiFi setup state machine + config_add_wifi (wifi_setup.c/h)
- Web-based WiFi setup via captive portal
- Display rotation fix (stride=480), color fixes, DMA byte-swap
- WiFi QR code on BOOT and ERROR screens
- ERROR state transition after WiFi retries exhausted
- Unit tests: test_touch, test_keyboard, test_wifi_setup
- Integration test: wifi_setup.mjs
- E2E test: wifi-setup.spec.mjs
- Per-board hardware locks for flash targets
Conflicts resolved: took master for config/cvm/api/main (more current),
took display-fix for display/axs15231b (newer fixes).
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tollgate_core_ip4_canforward_filter is in a separate component that
lwip can't link against. Use the existing tollgate_ip4_canforward_filter
from main/firewall.c instead.
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- Add tollgate_core ESP-IDF component (skeleton: cashu, dns, firewall, session)
- Add tollgate_platform.c with SPIFFS config backend
- Wire market_enabled, market_scan_interval_s, client_auto_switch in config.c
- Add lwip_tollgate_hooks.h (updated from feature branch)
- Add E2E fix plan, tollgate_core design doc, WPA autodetect plan
- Add integration test network helpers
- Add CONSOLIDATION.md plan
Reverts the broken merge (be4788b) that gutted config.c/tollgate_main.c/tollgate_api.c
and replaces it with a clean addition on top of intact master.
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- Create components/negentropy_lib/ wrapping negentropy submodule
- CMakeLists.txt references submodule sources via relative path
- OpenSSL SHA-256 compat using mbedTLS for ESP32
- Enables C++ exceptions + RTTI for negentropy_wrapper.cpp
- Remove esp_littlefs, esp_timer from REQUIRES (transitive via wisp_relay)
- Keep tcp_transport (direct dep of stratum_client.c via esp_transport.h)
- Fix config.c duplicate seed_relays/sync_interval/fallback_interval blocks
- Remove leftover merge conflict marker in tollgate_api.c
- Add MINER_INTEGRATION_PLAN.md with miner integration checklist
idf.py build: PASS (1.3MB, 68% free)
make test-unit: PASS (19 suites, 344+ assertions)
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- config.h: remove duplicate nostr_sync fields
- Makefile: add mint_health stub for test_session_payment_method
- test_tollgate_client_mining: inline market_t stub to avoid dependency cascade
- CMakeLists: add negentropy_adapter.c + esp_littlefs + negentropy REQUIRES
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New modules:
- mining_payment.c/h: hashprice calc (nbits->difficulty->sat/GH/s/day),
share validation, client stats, allotment conversion (ms + bytes)
- stratum_client.c/h: SV1 upstream pool connection (subscribe/authorize/submit)
- stratum_proxy.c/h: Local SV1 TCP server for downstream miners, job broadcast
- sw_miner.c/h: Software SHA256d miner (ESP32 CPU fallback)
- asic_miner.c/h: ASIC detection stub (BM1366/BM1368 SPI)
Config:
- config.h/c: mining_payout_mode_t enum (auto/pool/upstream/proxy_only),
stratum pool settings, mining port, hashprice override, sandbox mint access
- Defaults fill nostr_seed_relays (8/8) and nostr_relays (4/4) with fast relays
Integration into existing modules:
- session.h/c: payment_method_t enum (CASHU/MINING/BYTES)
- firewall.h/c: firewall_set_mining_port(), firewall_set_sandbox_mint_access()
- tollgate_api.c: GET /mining/job, POST /mining/share, GET /mining/stats
- tollgate_client.h/c: TG_CLIENT_MINING state, mining discovery tag parsing
- tollgate_main.c: mining init in start_services(), stratum_client_tick() in loop
- captive_portal.c: tabbed Cashu/Mine UI with live hashrate polling
Unit tests (69 new assertions across 4 suites):
- test_mining_payment (23 tests): nbits->difficulty, hashprice, client stats, allotment
- test_stratum_proxy (21 tests): job set/get, stats, type validation
- test_session_payment_method (12 tests): PAYMENT_METHOD enum, bytes/cashu methods
- test_tollgate_client_mining (20 tests): mining tag parsing, discovery struct
- test_firewall_sandbox (16 tests): client grant/revoke, max clients, setters
Enhanced test stubs:
- BaseType_t/pdPASS in freertos/task.h
- lwip: sockets.h, etharp.h, prot/ip.h, prot/ip4.h, prot/tcp.h, netif.h
- dns_server.h, esp_wifi_ap_get_sta_list.h
Build fixes:
- cvm_server.c: replace esp_timer_get_time() with xTaskGetTickCount(),
fix process_relay_message() 3-arg call to 2-arg, add WS keepalive ping
- stratum_proxy.c: widen task_name buffer 16->20
- sw_miner.c: add missing #include esp_random.h
- nucula_src: save_proofs() moved to public in wallet.hpp
Nostr relay updates:
- nostr_seed_relays: +relay.anzenkodo.workers.dev, +nostr.koning-degraaf.nl,
+knostr.neutrine.com, +nostr.einundzwanzig.space (8/8 slots)
- nostr_relays: +relay.anzenkodo.workers.dev, +nostr.koning-degraaf.nl (4/4 slots)
Squash-merge of feature/mining-payment (5 commits: c75230e..9d98ba1)
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Squash merge of feature/multi-mint-support (21 commits):
Multi-mint wallet:
- Accept payments from 4 mints: minibits, coinos, 21mint, lnvoltz
- Periodic health probing (300s interval, 3 recovery threshold)
- Multi-wallet init with nucula_wallet_init_multi()
- /mints and /wallet API endpoints
WPA auto-detect:
- wifi_auth_mode config field (default WPA2, supports WPA3)
- Runtime mapping to wifi_auth_mode_t in STA config
Display gating:
- display_enabled config field (default true)
- Guards display_init/display_update per-board
Bug fixes:
- 3s delay before service start prevents lwip mem_free assertion
- Real npub in discovery (identity_get()->npub_hex)
- Health probe interval 300s (production value)
- Duplicate services_start_task call removed
- UTF-8 arrow replaced with ASCII in log message
Tests: 61+14 unit tests passing, firmware builds clean
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Price discovery allows TollGate ESP32 boards to advertise their per-step
price via WiFi Vendor-Specific Information Elements (OUI 0xC0FFEE) in
beacon and probe response frames. Nearby boards passively scan and build
a market view of competing TollGates without requiring internet access.
Features:
- beacon_price.c/h: 26-byte packed Vendor IE payload (price, step, metric,
mint_hash, geohash, npub_hash), injected via esp_wifi_set_vendor_ie()
- market.c/h: Passive WiFi scan receiver, vendor IE callback parsing,
BSSID-correlated market entries, effective price ranking
- GET /market API endpoint: JSON market snapshot with discovered entries
- AP-only services: beacon + market + API start on WIFI_EVENT_AP_START,
independent of STA connectivity
- STA reconnect fix: 2s delay between retries creates scan windows;
s_sta_connecting guard prevents double-connect
- write-config-ap-only-a/b Makefile targets for STA-less testing
- market_tick() in main loop, client price comparison logging
Hardware verified: both boards discover each other via Vendor IE beacons.
Board A sees TollGate-C0E9CA (RSSI=-30), Board B sees TollGate-B96D80
(RSSI=-25). test-market.mjs: 9/9, test-price-discovery.mjs: 7/7 per board.
Unit tests: 45 new assertions across test_beacon_price (28) and test_market
(17). All 15 test suites pass. ESP-IDF build clean for ESP32-S3.
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Restores build broken by eeb9d2d (cvm-relay-stability removed deps):
- CMakeLists.txt: restore display.c, font.c, local_relay.c, relay_selector.c, sync_manager.c, axs15231b, qrcode, wisp_relay
- tollgate_main.c: restore display.h, local_relay.h, relay_selector.h, sync_manager.h includes and display calls
- cvm_server.c: kept master's keepalive/timeout/ping-pong fixes
New test infrastructure:
- test-local-relay, test-relay-nip11, test-cvm-roundtrip, test-cvm-mcp, test-cross-board make targets
- test-cvm-roundtrip.mjs: MCP get_config + get_balance via public relay
- test-cross-board.mjs: cross-board payment test
- test-cvm-mcp-relay.mjs: kept from master
New unit tests (35 tests):
- test_display.c: 22 tests for escape_wifi_field
- test_negentropy_adapter.c: 13 tests for negentropy adapter
New modules:
- negentropy_adapter.c/h: NIP-77 adapter skeleton
Docs:
- AGENTS.md: display module docs, new test commands
- RELAY_HARDENING_PLAN.md: hardening checklist
- RELAY_HARDENING_MERGE.md: merge plan and checklist
Cleanup:
- Removed CHECKLIST-CVM-RELAY.md, PLAN-SQUASH-MERGE.md (stale planning docs)
- Removed components/esp-miner submodule
Host unit tests: 63/63 pass
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Relay disconnect fix (cvm_server.c):
- TLS read timeout reduced from 15s to 1s (short poll loop)
- Ping timer fires every 30s independently of read activity
- Consecutive timeout counter (65s) detects real disconnects
- Handle relay close frames (opcode 0x08) explicitly
- Result: 120s+ stable connection (previously ~37s disconnect cycle)
MCP relay integration tests (17/17 pass via make test-cvm-mcp):
- MCP initialize roundtrip via relay.primal.net
- get_sessions returns session array
- get_usage returns metric/price/step fields
- Non-owner auth rejection (board silently drops)
- Owner control request passes after rejection test
Build fixes:
- Remove display/font/axs15231b/qrcode deps (from display branch, not here)
- Remove local_relay/relay_selector/sync_manager deps (from relay branch)
- Add esp_timer to CMakeLists REQUIRES
Host unit tests: 61/61 pass
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Local Nostr relay (NIP-01) on port 4869 with LittleFS 4MB storage.
All events published locally first, then synced to public relays via REQ-diff.
Relay selection via NIP-11 HTTP probing with NIP-77 scoring and auto-failover.
Components:
- wisp_relay: 16-file local relay (ws_server, storage_engine, sub_manager,
broadcaster, relay_validator, router, handlers, rate_limiter, nip11,
deletion, flash_monitor, relay_types)
- esp_littlefs: LittleFS VFS integration (git submodule)
- negentropy: for future NIP-77 binary sync (git submodule)
New source files:
- local_relay.c/h: thin wrapper for relay init/start/publish
- relay_selector.c/h: NIP-11 probe + scoring + auto-failover
- sync_manager.c/h: REQ-diff sync (primary 30min, fallback 6h)
Bug fixes:
- config.c: use-after-free (cJSON_Delete before seed_relays/sync parsing)
- local_relay: moved init to app_main for boot-time start (not gated on STA IP)
Flash layout: 4MB LittleFS partition at 0x500000 for relay_store
Test results (Board B, live hardware):
- Smoke: ping + HTTP 4869 + NIP-11: PASS
- NIP-11 info document: 10/11 PASS
- WS pub/sub (connect, REQ/EOSE, EVENT/OK, CLOSE, concurrent): 6/6 PASS
- Unit tests (relay_validator + relay_selector): 13/13 PASS
Hardware test make targets in physical-router-test-automation/:
- make relay-build, relay-flash-b, relay-test-smoke/nip11/pubsub/sync/full
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Complete CVM implementation: persistent WebSocket relay listener,
kind 25910 event subscription, MCP protocol handlers, CEP-6 announcements,
10 MCP tools, per-board hardware locks, WiFi EU regulatory fix.
Architecture:
- cvm_server.c: WS relay listener, kind 25910 subscription, MCP dispatch
- mcp_handler.c/h: 10 MCP tools (get_config, set_config, get_balance,
wallet_send, get_sessions, get_usage, set_payout, set_metric,
set_price, wallet_melt)
- Responses published via existing WS connection (not new TLS)
- Auth check: only owner npub accepted
- CEP-6: kinds 11316 (server), 11317 (tools), 10002 (relay list)
- WS ping/pong keepalive every 30s, 60s TLS read timeout
Critical fixes:
- WiFi country code DE (ESP-IDF defaults to CN, breaks EU APs)
- Subscription #p filter must be array not string
- Use-after-free: tags_str freed before nostr_event_to_json
- MCP responses via existing WS (ESP32 can't open multiple TLS)
- EVENT msg buffer underflow, WS frame masking, TLS write loop
Per-board hardware locks:
- Lock files in physical-router-test-automation/locks/
- lock-a/b/c, unlock-a/b/c targets in 3 Makefiles
- All hardware-touching targets require board lock
Verified on Board B via relay.primal.net:
- 282 unit tests passing (61 CVM + 60 MCP + 161 existing)
- MCP initialize roundtrip: PASS
- tools/list: PASS
- tools/call get_config: PASS
- tools/call get_balance: PASS
- tools/call set_price: PASS (write operation)
- CEP-6 announcements (11316, 11317, 10002): all accepted by relay
- WiFi STA connection (EnterSSID-2.4GHz): PASS with country code DE
- Board A WiFi confirmed hardware issue (not firmware)
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- esp_wifi_set_mac requires WIFI_MODE_APSTA set first (fixes Board B crash)
- Start services immediately when no STA network is configured
(standalone TollGate without upstream WiFi)
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- 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->pay->allow->revoke->block E2E works
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metric defaults to milliseconds, fix sys_evt stack overflow
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server skeleton
- mcp_handler.c/h: 4 tools (get_config, set_config, get_balance, wallet_send)
- nip04.c/h: AES-256-CBC + ECDH with 0x02 compressed pubkey prefix
- Fixed IV copy bug: mbedTLS AES-CBC modifies IV in-place
- Base64 encode/decode for ciphertext transport
- PKCS7 padding
- cvm_server.c/h: Nostr DM listener with FreeRTOS task
- config: cvm_enabled, cvm_relays fields
- 156 total tests passing across 10 test binaries
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- 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
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- New lnurl_pay.c/h: LNURL-pay protocol (GET .well-known/lnurlp + callback)
- New lightning_payout.c/h: threshold-based auto-payout with multi-recipient split
- Extended nucula_wallet bridge with nucula_wallet_melt() (NUT-05)
- Config: payout section with multi-mint, multi-recipient, fee_tolerance
- Default: enabled, TollGate@coinos.io, min_payout=128, min_balance=64
- 18 new unit tests (all passing), 134 total
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- New tollgate_client.c/h: detect upstream TollGate (kind=10021),
auto-pay via nucula wallet, session monitoring with 20% renewal
- State machine: IDLE→DETECTING→NEEDS_PAY→PAYING→PAID→RENEWING
- Blocking: upstream payment before local services start
- Synchronous wallet init (was async task)
- Client config: enabled, steps_to_buy, renewal_threshold_pct
- Updated PLAN.md with Phases 4-7 (client, payout, bytes, CVM)
- Updated CHECKLIST.md with all new phase items
- 30 new unit tests (all passing), 116 total
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- Expand esp_http_client.h stub: full config struct + method enum + init/perform/cleanup
- Add portTICK_PERIOD_MS + esp_err_to_name to stubs
- session.c: reject duplicate spent secrets in session_create (double-spend protection)
- .gitignore: add test binaries
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tests (11/11 pass)
- Add AGENTS.md: full project context + mandatory testing rules for AI sessions
- Add tests/unit/ with host-compiled C unit test infrastructure
- Clean stubs approach: ESP-IDF type stubs in tests/unit/stubs/, no source modifications
- Fix geohash.c bit extraction bug (3-byte span) found by unit tests
- test_geohash: 11/11 passing with reference vectors (Munich, NYC, origin, boundaries)
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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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- Add esp_netif_set_dns_info() on AP interface so DHCP advertises
AP as DNS server to clients (fixes captive portal on GrapheneOS)
- Embed price and mint URL directly in portal HTML via server-side
template substitution (no JavaScript fetch to :2121 needed)
- Move supported mints section below the token input field
- Add Playwright tests: no unresolved placeholders, embedded mint/price,
DOM order verification (14/14 passing)
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- Derive unique SSID (TollGate-{MAC4}{MAC5}) and AP IP (10.{b5}.{subnet}.1)
from factory MAC — boards no longer conflict
- Board A: TollGate-377C @ 10.55.85.1, Board B: TollGate-5050 @ 10.80.10.1
- Captive portal detection URIs return 200 with portal HTML (matching
esp32-mesh working approach) instead of 302 redirect
- Dynamic AP IP in portal HTML via __AP_IP__ template substitution
- Supported mints section in portal page (shows mint URL, tap to copy)
- Fixed mint URL to testnut.cashu.space (was stale in SPIFFS)
- DoT reject server on port 853 for DNS-over-TLS fallback
- DNS hijack: NXDOMAIN for all non-A queries, no forwarding for unauthed
- Playwright tests updated for 200 response on detection URIs
- Phase 2 test suite: 20/21 pass (test 22 expiry ping route issue)
- Tests 25-27 deferred to Phase 3 (Board B as second client)
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- 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)
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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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- 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
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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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