Added key mappings

src/helper/protocol_const.h

@@ -35,6 +35,14 @@
 #define CMD_VERSION 204
 #define CMD_ENCRYPTION 240
 
+#define BTN_LEFT 100
+#define BTN_RIGHT 101
+#define BTN_SELECT_DOWN 104
+#define BTN_SELECT_UP 105
+#define BTN_BACK 106
+#define BTN_HOME 200
+
+
 #define AUDIO_BUFFER_SIZE 2560
 #define AUDIO_BUFFER_OFFSET 12