cumulate uptime after deep sleep

src/cyclic.cpp

@@ -136,7 +136,13 @@ void doHousekeeping() {
 
 } // doHousekeeping()
 
-uint64_t uptime() { return millis(); }
+uint64_t _uptime(uint64_t diff) {
+  static uint64_t offset = 0;
+  offset += diff;
+  return millis() + offset;
+}
+
+uint64_t uptime(void){return _uptime(0);};
 
 uint32_t getFreeRAM() {
 #ifndef BOARD_HAS_PSRAM

src/reset.cpp

@@ -49,6 +49,7 @@ void do_after_reset(void) {
         (sleep_stop_time.tv_sec - RTC_sleep_start_time.tv_sec) * 1000 +
         (sleep_stop_time.tv_usec - RTC_sleep_start_time.tv_usec) / 1000;
     ESP_LOGI(TAG, "Time spent in deep sleep: %d ms", sleep_time_ms);
+    _uptime(sleep_time_ms); // increment uptime
 
     RTC_runmode = RUNMODE_WAKEUP;
     break;