Massive changes. Added a quite nice webinterface with live data using WebSockets. Removed the FTP server (wasn't that useful anyways). JSON creating using ArduinoJson instead of String concatenation. Ans, and, and.

include/playlist.h

@@ -1,25 +1,32 @@
 #pragma once
 #include <Arduino.h>
 #include <vector>
+#include <ArduinoJson.h>
 
 class Playlist {
 private:
 	uint32_t _position = 0;
 	uint32_t _current_track = 0;
+	bool _started = false;
 	bool _shuffled = false;
 	std::vector<String> _files;
 public:
 	Playlist(String path);
+	void start();
 	bool has_track_next();
 	bool has_track_prev();
 	bool track_next();
 	bool track_prev();
 	void track_restart();
+	bool set_track(uint8_t track);
 	void reset();
 	bool is_empty();
 	String get_current_file();
 	uint32_t get_position();
 	void set_position(uint32_t p);
 	void shuffle(uint8_t random_offset=0);
+	void advent_shuffle(uint8_t day);
 	bool is_fresh();
+	void dump();
+	void json(JsonObject json);
 };