update

WebServerManager.cpp

@@ -45,7 +45,7 @@ void WebServerManager::setupRoutes() {
     // Basic health check, handy when bringing up a new node in the
     // future multi-radar setup.
     _server.on("/status", HTTP_GET, [](AsyncWebServerRequest *request) {
-        StaticJsonDocument<128> doc;
+        JsonDocument doc;
         doc["status"] = "ok";
         doc["uptime_ms"] = millis();
         String out;
@@ -96,16 +96,16 @@ void WebServerManager::loop() {
 void WebServerManager::broadcastFrame(const RadarFrame &frame) {
     if (_ws.count() == 0) return; // skip serialization work if nobody's listening
 
-    StaticJsonDocument<512> doc;
+    JsonDocument doc;
     doc["sensor"] = "LD2453";
     doc["node_id"] = frame.node_id;
     doc["sequence"] = frame.sequence_number;
     doc["timestamp"] = frame.timestamp_ms;
 
-    JsonArray targets = doc.createNestedArray("targets");
+    JsonArray targets = doc["targets"].to<JsonArray>();
     for (uint8_t i = 0; i < frame.targetCount && i < 3; i++) {
         const RadarTarget &t = frame.targets[i];
-        JsonObject jt = targets.createNestedObject();
+        JsonObject jt = targets.add<JsonObject>();
         jt["id"] = i + 1; // radar slot index, NOT a persistent person ID
         jt["valid"] = t.valid;
         jt["x"] = t.x_mm;