Improve build and integrate firmware versioning

include/main.h

@@ -1,5 +1,25 @@
 #pragma once
 
+#define STRINGIFY_IMPL(x) #x
+#define STRINGIFY(x) STRINGIFY_IMPL(x)
+
+#ifndef FWVERSION
+#define VERSION "*undef*"
+#else
+#define VERSION STRINGIFY(FWVERSION)
+#endif
+
+#ifndef BUILD_DATE
+#define BUILD_DATE STRINGIFY(FWBUILDDATE)
+#endif
+
+#ifndef BUILD_TIME
+#define BUILD_TIME STRINGIFY(FWBUILDTIME)
+#endif
+
+#define FIRMWARE_TYPE STRINGIFY(PIO_ENV_BUILD)
+#define IDF_VERSION STRINGIFY(ESP_IDF_VERSION_MAJOR) "." STRINGIFY(ESP_IDF_VERSION_MINOR) "." STRINGIFY(ESP_IDF_VERSION_PATCH)
+
 // WIFI AP
 #define WIFI_CHANNEL 9
 #define WIFI_MAX_STA 2