From fe6aa9663d4cdabdc6e71db6068f8cd9e3739ffe Mon Sep 17 00:00:00 2001 From: Your Name Date: Tue, 19 May 2026 13:14:48 +0530 Subject: feat: WiFi beacon price discovery via Vendor IE (two-board verified) 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. --- main/market.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 main/market.h (limited to 'main/market.h') diff --git a/main/market.h b/main/market.h new file mode 100644 index 0000000..6dbf43c --- /dev/null +++ b/main/market.h @@ -0,0 +1,40 @@ +#ifndef MARKET_H +#define MARKET_H + +#include "beacon_price.h" +#include "esp_wifi.h" +#include "esp_err.h" +#include +#include + +#define MARKET_MAX_ENTRIES 10 + +typedef struct { + uint8_t bssid[6]; + char ssid[33]; + int8_t rssi; + uint16_t price_per_step; + uint32_t step_size; + uint8_t metric; + uint8_t mint_hash[4]; + uint8_t npub_hash[4]; + char geohash[TOLLGATE_IE_GEOHASH_MAX + 1]; + int64_t discovered_ms; + bool valid; +} market_entry_t; + +typedef struct { + market_entry_t entries[MARKET_MAX_ENTRIES]; + int count; + int64_t last_scan_ms; + bool scanning; + int consecutive_failures; +} market_t; + +esp_err_t market_init(void); +void market_tick(void); +const market_t *market_get(void); +int market_find_cheapest(void); +void market_parse_vendor_ie(const uint8_t sa[6], const vendor_ie_data_t *ie, int rssi); + +#endif -- cgit v1.2.3