configmanager: enhancements for version migration

include/configmanager.h

@@ -1,11 +1,12 @@
 #ifndef _CONFIGMANAGER_H
 #define _CONFIGMANAGER_H
 
-#include <Preferences.h>
 #include "globals.h"
+#include <Preferences.h>
 
 void saveConfig(bool erase = false);
 bool loadConfig(void);
 void eraseConfig(void);
+int version_compare(const String v1, const String v2);
 
 #endif

include/globals.h

@@ -60,8 +60,10 @@ enum runmode_t {
 };
 
 // Struct holding devices's runtime configuration
-// using packed to avoid compiler padding, because struct will be memcpy'd to byte array
+// using packed to avoid compiler padding, because struct will be memcpy'd to
+// byte array
 typedef struct __attribute__((packed)) {
+  char version[10];    // Firmware version
   uint8_t loradr;      // 0-15, lora datarate
   uint8_t txpower;     // 2-15, lora tx power
   uint8_t adrmode;     // 0=disabled, 1=enabled
@@ -80,7 +82,6 @@ typedef struct __attribute__((packed)) {
   uint8_t monitormode;   // 0=disabled, 1=enabled
   uint8_t runmode;       // 0=normal, 1=update
   uint8_t payloadmask;   // bitswitches for payload data
-  char version[10];      // Firmware version
 #ifdef HAS_BME680
   uint8_t
       bsecstate[BSEC_MAX_STATE_BLOB_SIZE + 1]; // BSEC state for BME680 sensor

include/ota.h

@@ -6,17 +6,15 @@
 #include "globals.h"
 #include "led.h"
 #include "display.h"
+#include "configmanager.h"
 
 #include <Update.h>
 #include <WiFi.h>
 #include <WiFiClientSecure.h>
 #include <BintrayClient.h>
-#include <string>
-#include <algorithm>
 
 int do_ota_update();
 void start_ota_update();
-int version_compare(const String v1, const String v2);
 void ota_display(const uint8_t row, const std::string status,
                  const std::string msg);
 void show_progress(unsigned long current, unsigned long size);