Improve build and integrate firmware versioning

src/main.cpp

@@ -1,4 +1,5 @@
 #include <Arduino.h>
+#include "main.h"
 #include <Preferences.h>
 #include <ArduinoJson.h>
 #include <WiFi.h>
@@ -10,7 +11,6 @@
 #include <NMEA2000.h>
 #include <N2kMsg.h>
 #include <N2kMessages.h>
-#include "main.h"
 #include "Nmea2kTwai.h"
 #include "N2kDeviceList.h"
 #include <map>
@@ -18,6 +18,21 @@
 #include "mbedtls/md.h" // for SHA256
 #include <esp32/clk.h> // for cpu frequency
 #include "driver/rtc_io.h" // for wakeup from deep sleep
+#include "esp_app_format.h" // for custom fw descriptor
+
+// ESP-IDF firmware descriptor
+__attribute__((section(".rodata_custom_desc"))) esp_app_desc_t custom_app_desc = {
+    ESP_APP_DESC_MAGIC_WORD,
+    1, // secure version
+    {0, 0}, // reserved
+    VERSION,
+    FIRMWARE_TYPE,
+    BUILD_DATE,
+    BUILD_TIME,
+    IDF_VERSION,
+    {},
+    {}
+};
 
 String get_sha256(String payload) {
     byte shaResult[32];
@@ -442,7 +457,7 @@ void setup() {
         StaticJsonDocument<512> doc;
         doc["systemName"] = "Keypad1";
         doc["logLevel"] = 0;
-        doc["version"] = "0.0";
+        doc["version"] = VERSION;
         doc["fwtype"] = "unknown";
         doc["salt"] = "secret";
         doc["AdminPassword"] = "********";