feat: introduce udp state machine

include/spore/core/ClusterManager.h

@@ -7,6 +7,8 @@
 #include <ArduinoJson.h>
 #include <ESP8266HTTPClient.h>
 #include <map>
+#include <vector>
+#include <functional>
 
 class ClusterManager {
 public:
@@ -26,4 +28,22 @@ public:
 private:
     NodeContext& ctx;
     TaskManager& taskManager;
+	enum class ListenState { WAITING_FOR_PACKET, MESSAGE_RECEIVED, DISPATCHING, DONE };
+	struct MessageHandler {
+		bool (*predicate)(const char*);
+		std::function<void(const char*)> handle;
+		const char* name;
+	};
+	void initMessageHandlers();
+	void handleIncomingMessage(const char* incoming);
+	static bool isDiscoveryMsg(const char* msg);
+	static bool isHeartbeatMsg(const char* msg);
+	static bool isResponseMsg(const char* msg);
+	static bool isNodeInfoMsg(const char* msg);
+	void onDiscovery(const char* msg);
+	void onHeartbeat(const char* msg);
+	void onResponse(const char* msg);
+	void onNodeInfo(const char* msg);
+	ListenState listenState = ListenState::WAITING_FOR_PACKET;
+	std::vector<MessageHandler> messageHandlers;
 };