v1: Live ADS-B radar with detail panel, units, legend, proximity LED alert

src/adsb_client.cpp

@@ -0,0 +1,127 @@
+#include "adsb_client.h"
+#include <WiFiClientSecure.h>
+#include <HTTPClient.h>
+#include <ArduinoJson.h>
+#include <time.h>
+
+namespace AdsbClient {
+
+namespace {
+    const char* kNoValidate = nullptr;
+
+    WiFiClientSecure persistentClient;
+    bool clientConfigured = false;
+}
+
+void primeTime() {
+    configTime(0, 0, "pool.ntp.org", "time.nist.gov");
+    time_t now = time(nullptr);
+    uint32_t start = millis();
+    while (now < 8 * 3600 * 2 && millis() - start < 5000) {
+        delay(100);
+        now = time(nullptr);
+    }
+}
+
+FetchResult fetch(double homeLat, double homeLon, float radiusKm,
+                   Aircraft* table, uint8_t tableCapacity) {
+    FetchResult result;
+
+    if (WiFi.status() != WL_CONNECTED) {
+        return result;
+    }
+
+    if (!clientConfigured) {
+        persistentClient.setInsecure();
+        persistentClient.setTimeout(Config::HTTP_TIMEOUT_MS);
+        clientConfigured = true;
+    }
+
+    HTTPClient http;
+    char url[160];
+    snprintf(url, sizeof(url),
+             "https://%s/api/v3/lat/%.5f/lon/%.5f/dist/%.0f",
+             Config::ADSB_API_HOST, homeLat, homeLon, radiusKm);
+
+    http.setTimeout(Config::HTTP_TIMEOUT_MS);
+    if (!http.begin(persistentClient, url)) {
+        return result;
+    }
+    http.setReuse(true);
+
+    int code = http.GET();
+    result.httpCode = code;
+
+    if (code != HTTP_CODE_OK) {
+        http.end();
+        return result;
+    }
+    JsonDocument filter;
+    JsonObject filterAc = filter["ac"].add<JsonObject>();
+    filterAc["hex"]      = true;
+    filterAc["flight"]   = true;
+    filterAc["r"]        = true;
+    filterAc["t"]        = true;
+    filterAc["lat"]      = true;
+    filterAc["lon"]      = true;
+    filterAc["alt_baro"] = true;
+    filterAc["baro_rate"]= true;
+    filterAc["gs"]       = true;
+    filterAc["track"]    = true;
+
+    JsonDocument doc;
+    DeserializationError err = deserializeJson(
+        doc, http.getStream(), DeserializationOption::Filter(filter));
+
+    http.end();
+
+    if (err) {
+        result.ok = false;
+        return result;
+    }
+
+    JsonArray acArray = doc["ac"].as<JsonArray>();
+    uint8_t idx = 0;
+    for (JsonObject ac : acArray) {
+        if (idx >= tableCapacity) break;
+
+        Aircraft& a = table[idx];
+        a = Aircraft{};
+
+        const char* hex = ac["hex"] | "";
+        strncpy(a.hex, hex, sizeof(a.hex) - 1);
+
+        const char* flight = ac["flight"] | "";
+        strncpy(a.callsign, flight, sizeof(a.callsign) - 1);
+
+        const char* reg = ac["r"] | "";
+        strncpy(a.reg, reg, sizeof(a.reg) - 1);
+
+        const char* type = ac["t"] | "";
+        strncpy(a.typeCode, type, sizeof(a.typeCode) - 1);
+
+        a.lat = ac["lat"] | 0.0f;
+        a.lon = ac["lon"] | 0.0f;
+
+        if (ac["alt_baro"].is<const char*>()) {
+            a.altBaroFt = 0;
+        } else {
+            a.altBaroFt = ac["alt_baro"] | 0;
+        }
+
+        a.vertRateFtMin = ac["baro_rate"] | 0;
+        a.groundSpeedKt = ac["gs"] | 0.0f;
+        a.headingDeg    = ac["track"] | 0.0f;
+
+        a.lastSeenMs = millis();
+        a.valid = (a.lat != 0.0f || a.lon != 0.0f);
+
+        if (a.valid) idx++;
+    }
+
+    result.ok = true;
+    result.aircraftCount = idx;
+    return result;
+}
+
+}