in sev state

src/network/node_simulator.h

@@ -0,0 +1,40 @@
+#pragma once
+
+// ============================================================================
+//  NodeSimulator - virtual nodes that generate sample audio in software.
+//
+//  Implements NodeSource so the CollectionService feeds simulated PCM through
+//  the exact same path as real UDP nodes. Each virtual node emits a distinct
+//  sine tone per mic plus a small DC marker per node, so channel -> track
+//  mapping is easy to verify in the WAV on a PC.
+//
+//  Enable/disable with NET_SIM_ENABLED (network_config.h). Use the simulator
+//  OR real nodes, not both (node IDs would collide).
+// ============================================================================
+
+#include "../services/service.h"
+#include "../core/node_registry.h"
+#include "collection_service.h"
+#include "network_config.h"
+
+
+class NodeSimulator : public Service, public NodeSource
+{
+public:
+    NodeSimulator(NodeRegistry& registry, RecordingController& recorder);
+
+    void begin() override;
+    void update() override;
+
+    // NodeSource
+    size_t readAudio(uint8_t nodeId, uint8_t* out, size_t maxBytes) override;
+
+private:
+    static float baseFrequency(uint8_t nodeId);
+
+    NodeRegistry&       nodes;
+    RecordingController& recorder;
+
+    uint32_t lastCallMs[NET_SIM_NODES];
+    float    phase[NET_SIM_NODES][NET_MICS_PER_NODE];
+};