persist uptime during deep sleep

include/cyclic.h

@@ -15,7 +15,6 @@ extern Ticker cyclicTimer;
 
 void setCyclicIRQ(void);
 void doHousekeeping(void);
-uint64_t _uptime(uint64_t diff);
 uint64_t uptime(void);
 void reset_counters(void);
 uint32_t getFreeRAM();

include/reset.h

@@ -13,4 +13,6 @@ void do_reset(bool warmstart);
 void do_after_reset(void);
 void enter_deepsleep(const uint64_t wakeup_sec, const gpio_num_t wakeup_gpio);
 
+extern RTC_DATA_ATTR unsigned long RTC_millis;
+
 #endif // _RESET_H