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How to Implement a Clock in OpenBeken Devices Without Using NTP Protocol

max4elektroda 7677 97
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How can I add a clock to OpenBeken devices that keeps time locally without relying on NTP, while staying compatible across platforms?

Implement it as a separate optional clock subsystem, not as NTP itself: split the generic time helpers out of the NTP driver, rename APIs to `Clock_*`, and gate the feature with a disabled-by-default `ENABLE_LOCAL_CLOCK` in `obk_config.h` so existing builds and devices are unaffected [#21031682][#21032115] Use a companion `ENABLE_LOCAL_CLOCK_ADVANCED` for DST/timezone handling if needed [#21032907] For timekeeping, base the clock on a more accurate uptime source from RTOS ticks rather than a simple `g_secondsElapsed++`, because the counter can drift and it should not be moved backward at runtime or driver logic may break [#21639787][#21639876] If you need an initial time source without NTP, the clock can be set from the browser or by an HTTP request from another device, then continue running locally [#21038303]
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  • #31 21046561
    divadiow
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    fresh flash. nothing set. will set to powersave 0 to be sure. is powersave on by default on W600?

    Added after 5 [minutes]:

    no matter. powersave 0

    Screenshot displaying device information with the W600 chipset.
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  • #32 21046574
    p.kaczmarek2
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    Currently powersave is never on by default, but I am considering enabling it.
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  • #33 21046836
    max4elektroda
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    @divadiow thanks for your "long term" tests and especially the new input on W600!

    divadiow wrote:
    I have a W600 now. Sadly, it's not happy very quickly

    Seems this platform is using another tick rate like Beken platforms.

    Hopefully I finally got it right now (factor "portTICK_RATE_MS" should be present on all platforms, equals to 2 on Beken and W600/W800 and 1 for LN882H and BL602).
    Now the code is:
    Code: text Expand Select all Copy to clipboard
    TickType_t actTick=portTICK_RATE_MS*xTaskGetTickCount();

    so I think I'm counting ms now on all platforms.
  • Helpful post
    #34 21046878
    divadiow
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    Screenshot of a system interface displaying device information.

    🤩

    Added after 8 [hours] 6 [minutes]:

    Screenshot with device information, showing date, time, and software version details.

    Added after 7 [hours] 45 [minutes]:

    @max4elektroda do all platforms need flashing again for a fresh round using latest changes?
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  • #35 21051969
    max4elektroda
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    It would be great if you could confirm its still working right on Beken (OpenBK7231T/N) and BL602 after my recent change (I did the tests for LN882H here).
    I just finished the first try on a configurable daylight saving time in my local code, but it need some cleanup to include it.
    After this I think it should be ready to include, but there is still some work to do to separate the generic clock functions from ntp-driver to a general "clock-driver".

    And up to now I only managed to build an image to use "#define" for the javascript code with some "handcrafted" code like this in "new_http.c":
    Code: text Expand Select all Copy to clipboard
    

#if ENABLE_LOCAL_CLOCK
#define PMNTP "<some 'gulped' JS code here>"
#else
#define PMNTP ""
#endif
//region_start pageScript
const char pageScript[] = "<script type='text/javascript'>var [...](++onlineFor)"PMNTP"}function onLoad()[...];</script>";
//region_end pageScript
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  • #36 21053508
    p.kaczmarek2
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    This is exactly what I wanted, thank you! This is beginning to look very professional, i hope we can merge it soon. Very good job on supporting other platforms as well.
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    #37 21054381
    divadiow
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    Screenshot of a device management panel with information about time, software versions, and device MAC addresses.
  • #38 21055037
    divadiow
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    damn. watchdog kicked the BL602

    Screenshot of a device monitoring interface showing details about various devices, including online duration, MAC address, and chipset type.
  • #39 21061947
    divadiow
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    BL602 died again. the rest seem like a success though? LN jumped ahead slightly? Maybe not enough to care about.
    Screenshot showing information about various devices and a system clock.
  • #40 21062117
    max4elektroda
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    Thank you so much for your tests @divadiow, the clocks are all in the expected range of precision.
    That should work for all cases of calculating "daily values" and even work for most of the switching purposes, when it doesn't matter if the clock differs one minute after a month.
    Maybe in the future we can even add kind of a correction factor to add/subtract a second every xxx seconds ...
    From my side, these tests are successful and don't need to be continued.
    What's currently untested is the case of "overflow" of the tick counter, but it will happen only every 50 days...
    So thanks again for your support, it helped a lot!
  • #41 21062314
    divadiow
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    Awesome. No probs 👍
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  • #42 21063405
    max4elektroda
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    So, after the test is before the (next) test, so if you (or other brave guys) are willing to take another try:

    I just finished a universal daylight saving handling, heavily relying on the Tasmota code:

    You are no longer bound to the settings during compilation, but can set DST freely.
    So if this could be tested on other platforms with some other configuration tests, that would be great.
    I attached a file with all the DST settings on Tasmota DST page "rewritten" for my approach.


    And I would appreciate if @p.kaczmarek2 could have a look at the PR, too, especially on the change to "new_pins.h":
    I added a uint64 to config to be able to save the clock settings (at least, I tried ;-), not sure if padding is needed and if my calculation is right)

    In the meantime, I did some tests about xTicks overflow by defining a 16-bit TickType_t locally and could verify (on my LH882H) that this works as intended (with 16-bit the overflow is after 1 minute and some seconds, not every 50 days as with 32-bit counter).

    So, if the tests are successful, I can disable some "chatty" information, disable the functions tested and then I would expect it ready for merging...
    Attachments:
    • obk_dst_settings_2.txt (11.54 KB) You must be logged in to download this attachment.
  • #43 21064685
    p.kaczmarek2
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    The new_pins.h config change look okay, but if you want to be sure, just try flashing built binaries to any BK7231 or other device. So far your changes are looking good, keep it up!
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    #44 21064882
    divadiow
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    well, they all flash and set timer from browser OK as before

    Screenshot with information about multiple devices, their online status, and system time.

    I also set PC time to next daylight savings change and saw it go back an hour and switch to GMT from BST. Only watched it on BK7231T though. Do you want all? Is that part of the test required?

    Screenshot showing software version and device time information.

    Added after 4 [minutes]:



  • #45 21064958
    omniron
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    Now that our balcony unit is working again (thanks to p.kaczmarek2), I'm really looking forward to implement a silent NTP update for rickbronson great sunrise/set function.

    This is what I have

    // Turn off/on Balcony by Sunrise/rise
    PowerSave 1
    startDriver ntp
    ntp_timeZoneOfs -8
    ntp_setLatlong 44.002130 -123.091473
    removeClockEvent 12
    removeClockEvent 13
    waitFor NTPState 1
    addClockEvent sunrise 0x7f 12 POWER2 OFF
    addClockEvent sunset 0x7f 13 POWER2 ON

    But in order for the above to work I must allow internet access for the NTP update, hope I can avoid that with your fine clock implementation.
    Thank you guys, really great work here!!
  • #46 21065169
    max4elektroda
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    That should be possible in the future. ATM the split of general time functions like sunrise/sunset and timed events are somehow "glued" to ntp.
    Splitting this will need to add additional source files to every platform (but I can try to give you a "preview" if I know your platform).
    There still is one drawback: every loss of power will need setting of the clock.
    This can be done easily from another device but needs some "process" like another device checks the clock of the module regularly and then sets it via http, if unset.
    Or (it's just a hacked proof of concept which would need some deeper testing) if the beken device can reach an http server (e.g router) sending a "date:" header, you can let the device get its time from a locally reachable webserver.

    Added after 11 [minutes]:

    And again a big thanks to @divadiow for your tests. I think this proves its working o.k. now.
    I will try to prepare the PR for merging, mainly set all #defines to 0 in obk_config.h
  • #47 21611170
    max4elektroda
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    I just opened PR#1729, which is actually in sync with main (since many files are involved, the PRs regulary have merge conflicts after some time).
    I would really like some feedback, maybe someone can take the time to dig into changes and give feedback.
  • #48 21611193
    p.kaczmarek2
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    Interesting, first of all:
    - any breaking changes?
    - how much binary increase and is it optional or mandatory?

    Added after 2 [minutes]:

    So you basically split clock from NTP (as title said), so it means it's now easier/more clearer to integrate CR2032-backed RTC module via I2C? Hm
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  • #49 21611382
    max4elektroda
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    p.kaczmarek2 wrote:
    Interesting, first of all:
    - any breaking changes?
    - how much binary increase and is it optional or mandatory?

    I didn't find any breaking changes, but actual PR needs some more testing.
    Actually I have to find out, what changed - last PR was "usually" smaller (for all builds using NTP) but this is increasing size significantly and I need to check why. I have an idea, but need to check.

    p.kaczmarek2 wrote:
    So you basically split clock from NTP (as title said), so it means it's now easier/more clearer to integrate CR2032-backed RTC module via I2C? Hm

    To be honest, I didn't see CR2032 code, but in fact, that should be quite easy to add any source providing time.
    I did e.g. a quick hack to set clock by NEO6M, just as a proof of concept.
  • #50 21611390
    p.kaczmarek2
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    CR2032 is a battery, I had a whole family of RTC modules in mind, but to give a sample, DS3231 is popular:
    How to Implement a Clock in OpenBeken Devices Without Using NTP Protocol
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  • #51 21611408
    max4elektroda
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    p.kaczmarek2 wrote:
    CR2032 is a battery,

    Oh, sure, just was in another "context" ;-)

    Is there some code just now for these in OBK (or in an PR)?

    Just curious ...
  • #53 21632647
    max4elektroda
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    Won't promise anything @omniron but just ordered some modules to try.

    We have some other i2c devices, so base is already there.
    We'll still need this or a similar change to OBK to enable clock functionality without NTP.
  • #54 21633540
    omniron
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    Thank you @max4elektroda
    I use the ones you pictured and the smaller one from my mod.
    The smaller fits barely in existing smart units, but meanwhile there are even smaller RTC boards with the DS3231.

    Would be great to have an RTC working since some of smart things are in a remote location with no internet.
    Except when I'm there and I make a hotspot
    Power outages are fequent, messing up the timing etc.

    Hope you can get it going and maybe @p.kaczmarek2 can help with OBK integration?

    Thanks!!
  • #55 21633562
    max4elektroda
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    What chip is your plug using?
    Btw, just for a situation like yours, I have drafted a solution to use a cheap GPS as time source.
    But for use with a plug this is no optimal solution since usually the pins are on life potential, not good to access without optical isolation...
    Also, deep in my box of things to do: I once ordered a DCF77 module, never found the time to work with it.
    It should be doable if I got it right, "only" need to measure signals for 1 and 0 every second over one minute and decode them.

    Added after 10 [minutes]:

    Ah, I forgot you mentioned tasmota, so I expect some ESP32 variant or ESP8266?

    Added after 7 [hours] 33 [minutes]:

    If you like, you can test my first try here:

    https://github.com/MaxineMuster/OpenBK7231T_App/actions/runs/16915983611

    For now it will only display the time on main screen:


    OpenESP32 interface screen showing DS3231 time and system status

    Code: text Expand Select all Copy to clipboard
    startdriver DS3231 <CLK-Pin> <DATA-Pin>
   e.g. startdriver DS3231 32 33
Commands:

DS3231_GetTime
DS3231_GetEpoch


DS3231_SetTime <hours> <minutes> <seconds> <date> <month> <year>
DS3231_SetEpoch <epoch time>


    Added after 6 [hours] 48 [minutes]:

    Updated driver start.

    https://github.com/MaxineMuster/OpenBK7231T_App/actions/runs/16947283141

    Now you can add an optional "sync" parameter:

    startdriver DS3231 <CLK-Pin> <DATA-Pin> <optional sync>

    sync values: 0: do nothing 1: set devicetime to RTC on startup 2: set devicetime to RTC regulary (making RTC clock source)

    to set RTC you can e.g. use on a Linux device

    wget "http://<ip.of.your.plug>/cmd_tool?cmd=DS3231_SetEpoch $(date +%s)"

    @p.kaczmarek2 is there any chance to indicate a driver can't start?

    E.g. if not all required pins are set ...
    If I got it right, even then OBK will always assume driver started after calling initFunc.

    If I didn't miss something, maybe we should change that?
    We could
    - make startdriver function "bool" instead of void
    - add "number of required arguments" to driver_t
    - or add a global var, which could be set to "error" during Driver_Init, so no need to change anything but only checking this before setting driver to "running"
  • #56 21634305
    p.kaczmarek2
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    I would really like to have that driver in main, please help me merge it when it's ready. Currently I am doing OTA clearup - moving platform specific things to HAL.

    My idea for error signaling is a bit different - I've been thinking that maybe we should have some kind of "errors buffer", something with API like:
    Code: C / C++
    Log in, to see the code

    and keep like, idk, last 10 errors in single linked list, and display them on main page, so they can't be missed. That would reside outside of the web app log which is in a ring buffer and gets lost easily.

    Stiill, if you want to edit driver start, hm... maybe make Driver init function return cmdResult_t ?
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  • #57 21634310
    max4elektroda
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    Startup command run for driver ds3231 with parameters 32 33 2





    Added after 18 [minutes]:

    p.kaczmarek2 wrote:
    I would really like to have that driver in main, please help me merge it when it's ready.

    The "problem" is, if you could accept the big change of "NTP centered" to a "device clock".
    Its of no real use if it can only display the time on main page but should set the clock if there's no other possible source.
    Without the PR we would need to start NTP and let DS3231 somehow "fake" ntp and manipulate g_ntpTime.

    I would be glad if our loyal supporter @divadiow would assist testing the PR.
    Main question would be: Is NTP working as before, in all possible aspects.

    And lastly, we will need some idea of the "leading" clock, if there are several possible sources.
    But this might also be easy, by letting the user decide about this.

    Regarding errors: let's put that away now, and keep it in mind for later.
    It was just I stumbled over what to do if pins are not given - and we might have that with drivers started with pins as arguments or pins from pin_roles.
    drv_main can't know the prerequisites for every driver, so it might be good to somehow catch the case it's not successfully started in the future.

    Will continue next days, will call it a day for now.

    Added after 4 [minutes]:

    p.kaczmarek2 wrote:
    Stiill, if you want to edit driver start, hm... maybe make Driver init function return cmdResult_t ?


    Yes, that might be an idea, let me take a look next days, if this is possible change for all drivers...
  • #58 21634379
    p.kaczmarek2
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    What is the state of the time PR, does it increase memory footprint much?
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  • #59 21634555
    max4elektroda
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    PR from my tests is working fine, I couldn't find anything broken.

    Size is a bit difficult:

    I have two approaches: First to save some space I made a version with an own "time.h" replacement for many functions.
    This is quite effective for several platformse.g. BL602, where the resulting firmware is much smaller but there are also some with size increases more than 1k, top TR6260 with +1,2k where I don't really see, why. Maybe I somehow managed to unintentionally include parts of NTP there??

    EDIT:
    resolved merge conflicts. These are the actual values, I think I'll have to double check, if I disabled something in the first ones to realize this reduction in size (-12k for sensors builds), but I can't find something on the first view:

    Code: text Expand Select all Copy to clipboard
    diff --git a/src/obk_config.h b/src/obk_config.h
index b55c669a7b..4d5e4450c8 100644
--- a/src/obk_config.h
+++ b/src/obk_config.h
@@ -73,7 +73,7 @@
 #define ENABLE_MQTT                        1
 #define ENABLE_TASMOTADEVICEGROUPS            1
 #define ENABLE_NTP                        1
-// #define ENABLE_NTP_DST                  1
+//#define ENABLE_CLOCK_DST                  1
 #define ENABLE_DRIVER_BL0937               1
 #define ENABLE_DRIVER_DHT                  1
 #define ENABLE_TASMOTA_JSON                  1
@@ -97,6 +97,8 @@
 #define ENABLE_DRIVER_DS1820               1
 #define ENABLE_DRIVER_DHT                  1
 #define ENABLE_NTP                        1
+#define ENABLE_CLOCK_DST                  1
+#define ENABLE_CLOCK_PMNTP                  1
 #define ENABLE_DRIVER_BMPI2C               1
 #define ENABLE_DRIVER_CHT83XX               1
 #define ENABLE_I2C                        1
@@ -128,7 +130,7 @@
 #define ENABLE_TASMOTADEVICEGROUPS            1
 #define ENABLE_LITTLEFS                     1
 #define ENABLE_NTP                        1
-#define ENABLE_NTP_DST                     1
+#define ENABLE_CLOCK_DST                     1
 #define ENABLE_DRIVER_LED                  1
 #define ENABLE_DRIVER_BL0937               1
 #define ENABLE_DRIVER_BL0942               1
@@ -152,7 +154,7 @@
 #define ENABLE_DRIVER_PT6523               1
 #define ENABLE_DRIVER_MAX6675               1
 #define ENABLE_DRIVER_TEXTSCROLLER            1
-#define ENABLE_NTP_SUNRISE_SUNSET            1
+#define ENABLE_CLOCK_SUNRISE_SUNSET            1
 // parse things like $CH1 or $hour etc
 #define ENABLE_EXPAND_CONSTANT               1
 #define ENABLE_DRIVER_DHT                  1
@@ -187,7 +189,7 @@
 #define ENABLE_TASMOTADEVICEGROUPS            1
 #define ENABLE_LITTLEFS                     1
 #define ENABLE_NTP                        1
-// #define ENABLE_NTP_DST                  1
+// #define ENABLE_CLOCK_DST                  1
 #define ENABLE_CALENDAR_EVENTS               1
 #define ENABLE_DRIVER_LED                  1
 #define ENABLE_DRIVER_BL0937               1
@@ -223,7 +225,7 @@
 #define ENABLE_TASMOTADEVICEGROUPS            1
 #define ENABLE_LITTLEFS                     1
 #define ENABLE_NTP                        1
-// #define ENABLE_NTP_DST                  1
+// #define ENABLE_CLOCK_DST                  1
 #define ENABLE_NTP_SUNRISE_SUNSET            1
 #define ENABLE_DRIVER_LED                  1
 #define ENABLE_DRIVER_BL0937               1
@@ -253,6 +255,7 @@
 #define ENABLE_DRIVER_SM16703P               1
 #define ENABLE_DRIVER_PIXELANIM               1
 #define ENABLE_DRIVER_SM15155E               1
+
 #endif
 // parse things like $CH1 or $hour etc
 #define ENABLE_EXPAND_CONSTANT               1
@@ -333,7 +336,7 @@
 #define ENABLE_MQTT                        1
 #define ENABLE_TASMOTADEVICEGROUPS            1
 #define ENABLE_NTP                        1
-//#define ENABLE_NTP_DST                  1
+//#define ENABLE_CLOCK_DST                  1
 #define ENABLE_DRIVER_BL0937               1
 #define ENABLE_DRIVER_LED                   1
 #define ENABLE_DRIVER_WEMO                  1
@@ -360,7 +363,7 @@
 #define ENABLE_MQTT                        1
 #define ENABLE_I2C                        1
 #define ENABLE_NTP                        1
-//#define ENABLE_NTP_DST                  1
+//#define ENABLE_CLOCK_DST                  1
 #define ENABLE_DRIVER_LED                  1
 #define ENABLE_DRIVER_TUYAMCU               1
 #define ENABLE_LITTLEFS                     1


    Spoiler:

    Code: text Expand Select all Copy to clipboard
    
Size +/-    Filename                                                       1.18.154   1729_merge_803dd2fb5130
-12016      OpenBK7231T_XX_sensors.bin                                       763129                     751113
-12008      OpenBK7231N_XX_sensors.bin                                       794177                     782169
-11760      OpenW800_XX.fls                                                  694236                     682476
-11744      OpenBK7231N_XX.bin                                               802065                     790321
-11728      OpenBK7231T_XX.bin                                               769513                     757785
-7388       OpenW800_XX_ota.img                                              415724                     408336
-6928       OpenBK7231N_UG_XX_sensors.bin                                    496880                     489952
-6928       OpenBK7231N_XX_sensors.rbl                                       496848                     489920
-6864       OpenBK7231T_UG_XX_sensors.bin                                    474128                     467264
-6864       OpenBK7231T_XX_sensors.rbl                                       474096                     467232
-6832       OpenBK7252_XX.rbl                                                529936                     523104
-6720       OpenBK7231N_ALT_XX.rbl                                           511056                     504336
-6576       OpenBK7231N_UG_XX.bin                                            503744                     497168
-6576       OpenBK7231N_XX.rbl                                               503712                     497136
-6464       OpenBK7238_XX.rbl                                                510288                     503824
-6416       OpenBK7231U_XX.rbl                                               522944                     516528
-6384       OpenBK7231T_ALT_XX.rbl                                           522544                     516160
-6336       OpenBK7231T_UG_XX.bin                                            479296                     472960
-6336       OpenBK7231T_XX.rbl                                               479264                     472928
-6000       OpenBK7252N_XX.rbl                                               515504                     509504
-5936       OpenLN882H_XX.bin                                                761676                     755740
-3599       OpenLN882H_XX_OTA.bin                                            430746                     427147
-1600       OpenBL602_XX_berry.bin                                           922400                     920800
-1600       OpenBL602_XX_berry_OTA.bin                                       926496                     924896
-1600       OpenBL602_XX.bin                                                 797384                     795784
-1600       OpenBL602_XX_OTA.bin                                             801488                     799888
-1528       OpenBK7238_XX_irRemoteESP.bin                                    859961                     858433
-1392       OpenBK7231N_XX_powerMetering.bin                                 783861                     782469
-1392       OpenBK7231T_XX_powerMetering.bin                                 753181                     751789
-1104       OpenBK7238_XX_irRemoteESP.rbl                                    570464                     569360
-1088       OpenBK7231N_UG_XX_powerMetering.bin                              504480                     503392
-1088       OpenBK7231N_XX_powerMetering.rbl                                 504448                     503360
-1008       OpenBL602_XX_OTA.bin.xz                                          442832                     441824
-1008       OpenBL602_XX_OTA.bin.xz.ota                                      443344                     442336
-1000       OpenBK7231N_XX_irRemoteESP.bin                                   901101                     900101
-1000       OpenBK7231T_XX_irRemoteESP.bin                                   876453                     875453
-1000       OpenBL602_XX_berry_OTA.bin.xz                                    510632                     509632
-1000       OpenBL602_XX_berry_OTA.bin.xz.ota                                511144                     510144
-992        OpenBK7231T_UG_XX_powerMetering.bin                              482160                     481168
-992        OpenBK7231T_XX_powerMetering.rbl                                 482128                     481136
-944        OpenBK7231T_UG_XX_irRemoteESP.bin                                547216                     546272
-944        OpenBK7231T_XX_irRemoteESP.rbl                                   547184                     546240
-832        OpenBK7238_XX_berry.rbl                                          574304                     573472
-736        OpenBK7231N_XX_berry.bin                                         905153                     904417
-712        OpenBK7231T_XX_berry.bin                                         872609                     871897
-624        OpenBK7231N_UG_XX_irRemoteESP.bin                                565328                     564704
-624        OpenBK7231N_XX_irRemoteESP.rbl                                   565296                     564672
-576        OpenBK7231N_UG_XX_berry.bin                                      568144                     567568
-576        OpenBK7231N_XX_berry.rbl                                         568112                     567536
-480        OpenBK7231T_UG_XX_berry.bin                                      544592                     544112
-480        OpenBK7231T_XX_berry.rbl                                         544560                     544080
-368        OpenBK7231N_UG_XX_tuyaMCU.bin                                    502480                     502112
-368        OpenBK7231N_XX_tuyaMCU.rbl                                       502448                     502080
-320        OpenBK7231T_XX_tuyaMCU.bin                                       751413                     751093
-312        OpenBK7231N_XX_tuyaMCU.bin                                       780733                     780421
-192        OpenBK7231T_UG_XX_tuyaMCU.bin                                    480960                     480768
-192        OpenBK7231T_XX_tuyaMCU.rbl                                       480928                     480736
-16         OpenW600_XX.fls                                                  549352                     549336
0           OpenBK7231M_ALT_QIO_XX.bin                                      1253376                    1253376
0           OpenBK7231M_QIO_XX.bin                                          1220464                    1220464
0           OpenBK7231N_ALT_QIO_XX.bin                                      1253376                    1253376
0           OpenBK7231N_ALT_UA_XX.bin                                       1183744                    1183744
0           OpenBK7231N_QIO_XX_berry.bin                                    1220464                    1220464
0           OpenBK7231N_QIO_XX.bin                                          1220464                    1220464
0           OpenBK7231N_QIO_XX_irRemoteESP.bin                              1220464                    1220464
0           OpenBK7231N_QIO_XX_powerMetering.bin                            1220464                    1220464
0           OpenBK7231N_QIO_XX_sensors.bin                                  1220464                    1220464
0           OpenBK7231N_QIO_XX_tuyaMCU.bin                                  1220464                    1220464
0           OpenBK7231N_UA_XX_berry.bin                                     1150832                    1150832
0           OpenBK7231N_UA_XX.bin                                           1150832                    1150832
0           OpenBK7231N_UA_XX_irRemoteESP.bin                               1150832                    1150832
0           OpenBK7231N_UA_XX_powerMetering.bin                             1150832                    1150832
0           OpenBK7231N_UA_XX_sensors.bin                                   1150832                    1150832
0           OpenBK7231N_UA_XX_tuyaMCU.bin                                   1150832                    1150832
0           OpenBK7231T_ALT_QIO_XX.bin                                      1253376                    1253376
0           OpenBK7231T_ALT_UA_XX.bin                                       1183744                    1183744
0           OpenBK7231T_QIO_XX_berry.bin                                    1048576                    1048576
0           OpenBK7231T_QIO_XX.bin                                          1048576                    1048576
0           OpenBK7231T_QIO_XX_irRemoteESP.bin                              1048576                    1048576
0           OpenBK7231T_QIO_XX_powerMetering.bin                            1048576                    1048576
0           OpenBK7231T_QIO_XX_sensors.bin                                  1048576                    1048576
0           OpenBK7231T_QIO_XX_tuyaMCU.bin                                  1048576                    1048576
0           OpenBK7231T_UA_XX_berry.bin                                      978944                     978944
0           OpenBK7231T_UA_XX.bin                                            978944                     978944
0           OpenBK7231T_UA_XX_irRemoteESP.bin                                978944                     978944
0           OpenBK7231T_UA_XX_powerMetering.bin                              978944                     978944
0           OpenBK7231T_UA_XX_sensors.bin                                    978944                     978944
0           OpenBK7231T_UA_XX_tuyaMCU.bin                                    978944                     978944
0           OpenBK7231U_QIO_XX.bin                                          1253376                    1253376
0           OpenBK7231U_UA_XX.bin                                           1183744                    1183744
0           OpenBK7238_QIO_XX_berry.bin                                     1253376                    1253376
0           OpenBK7238_QIO_XX.bin                                           1253376                    1253376
0           OpenBK7238_QIO_XX_irRemoteESP.bin                               1253376                    1253376
0           OpenBK7238_UA_XX_berry.bin                                      1183744                    1183744
0           OpenBK7238_UA_XX.bin                                            1183744                    1183744
0           OpenBK7238_UA_XX_irRemoteESP.bin                                1183744                    1183744
0           OpenBK7252N_QIO_XX.bin                                          1253376                    1253376
0           OpenBK7252N_UA_XX.bin                                           1183744                    1183744
0           OpenBK7252_QIO_XX.bin                                           1253376                    1253376
0           OpenBK7252_Tuya_QIO_XX.bin                                      1253376                    1253376
0           OpenBK7252_Tuya_UA_XX.bin                                       1183744                    1183744
0           OpenBK7252_UA_XX.bin                                            1183744                    1183744
0           OpenRTL8720D_XX.bin                                             1044480                    1044480
0           OpenRTL8720D_XX_ota.img                                         1019936                    1019936
0           OpenRTL87X0C_XX.bin                                              950276                     950276
0           OpenRTL87X0C_XX_ota.img                                          884740                     884740
0           OpenXR809_XX.img                                                 921384                     921384
0           OpenXR872_XX.img                                                 798552                     798552
144         OpenW600_XX_gz.img                                               334824                     334968
480         OpenESP32S3_XX_4M.factory.bin                                   1063888                    1064368
480         OpenESP32S3_XX_4M.img                                            998352                     998832
496         OpenESP32S2_XX_4M.factory.bin                                   1037936                    1038432
496         OpenESP32S2_XX_4M.img                                            972400                     972896
496         OpenESP32_XX_4M.factory.bin                                     1063952                    1064448
496         OpenESP32_XX_4M.img                                              998416                     998912
536         OpenXR806_XX_ota.img                                             494232                     494768
544         OpenESP32C2_XX_2M.factory.bin                                    911312                     911856
544         OpenESP32C2_XX_2M.img                                            845776                     846320
548         OpenRTL8710A_XX.bin                                              780076                     780624
548         OpenRTL8710A_XX_ota.img                                          735024                     735572
551         OpenECR6600_XX_ota.img                                           526833                     527384
552         OpenECR6600_XX.bin                                               981397                     981949
552         OpenRTL8710B_XX.bin                                              627076                     627628
560         OpenESP32C2_XX_4M.factory.bin                                   1039344                    1039904
560         OpenESP32C2_XX_4M.img                                            973808                     974368
560         OpenESP32C3_XX_2M.factory.bin                                   1017424                    1017984
560         OpenESP32C3_XX_2M.img                                            951888                     952448
560         OpenESP32C3_XX_4M.factory.bin                                   1145360                    1145920
560         OpenESP32C3_XX_4M.img                                           1079824                    1080384
560         OpenESP32C5_XX_4M.factory.bin                                   1232720                    1233280
560         OpenESP32C5_XX_4M.img                                           1167184                    1167744
560         OpenESP32C61_XX_4M.factory.bin                                  1177632                    1178192
560         OpenESP32C61_XX_4M.img                                          1112096                    1112656
560         OpenESP32C6_XX_4M.factory.bin                                   1240912                    1241472
560         OpenESP32C6_XX_4M.img                                           1175376                    1175936
576         OpenRTL8720E_XX.bin                                             1401504                    1402080
576         OpenRTL8720E_XX_ota.img                                         1319616                    1320192
576         OpenXR872_XX_ota.img                                             446340                     446916
826         obkSimulator_XX.zip                                             2462873                    2463699
832         OpenESP8266_1MB_XX.factory.bin                                   814512                     815344
832         OpenESP8266_2MB_XX.factory.bin                                   814512                     815344
832         OpenESP8266_XX.img                                               748976                     749808
960         OpenRTL8721DA_XX.bin                                            1522368                    1523328
960         OpenRTL8721DA_XX_ota.img                                        1440480                    1441440
1024        OpenXR806_XX.img                                                 868192                     869216
1104        OpenRTL8710B_XX_ota.img                                         1254160                    1255264
1268        OpenTR6260_XX.bin                                                654160                     655428




    So I made a second variant, without this separate time.h "replacement" code.

    This is usually bigger up to +600 bytes for most, and again two "special" ones (E6000 +1,1k and TR6260 +2k).
    This is with all have the basic clock enabled, which can be set via "clock_setTime".

    Spoiler:

    Code: text Expand Select all Copy to clipboard
    
Size +/-    Filename                                                       1.18.154     _NTP_WIP_2320765352bf
0           OpenBK7231M_ALT_QIO_XX.bin                                      1253376                    1253376
0           OpenBK7231M_QIO_XX.bin                                          1220464                    1220464
0           OpenBK7231N_ALT_QIO_XX.bin                                      1253376                    1253376
0           OpenBK7231N_ALT_UA_XX.bin                                       1183744                    1183744
0           OpenBK7231N_QIO_XX_berry.bin                                    1220464                    1220464
0           OpenBK7231N_QIO_XX.bin                                          1220464                    1220464
0           OpenBK7231N_QIO_XX_irRemoteESP.bin                              1220464                    1220464
0           OpenBK7231N_QIO_XX_powerMetering.bin                            1220464                    1220464
0           OpenBK7231N_QIO_XX_sensors.bin                                  1220464                    1220464
0           OpenBK7231N_QIO_XX_tuyaMCU.bin                                  1220464                    1220464
0           OpenBK7231N_UA_XX_berry.bin                                     1150832                    1150832
0           OpenBK7231N_UA_XX.bin                                           1150832                    1150832
0           OpenBK7231N_UA_XX_irRemoteESP.bin                               1150832                    1150832
0           OpenBK7231N_UA_XX_powerMetering.bin                             1150832                    1150832
0           OpenBK7231N_UA_XX_sensors.bin                                   1150832                    1150832
0           OpenBK7231N_UA_XX_tuyaMCU.bin                                   1150832                    1150832
0           OpenBK7231T_ALT_QIO_XX.bin                                      1253376                    1253376
0           OpenBK7231T_ALT_UA_XX.bin                                       1183744                    1183744
0           OpenBK7231T_QIO_XX_berry.bin                                    1048576                    1048576
0           OpenBK7231T_QIO_XX.bin                                          1048576                    1048576
0           OpenBK7231T_QIO_XX_irRemoteESP.bin                              1048576                    1048576
0           OpenBK7231T_QIO_XX_powerMetering.bin                            1048576                    1048576
0           OpenBK7231T_QIO_XX_sensors.bin                                  1048576                    1048576
0           OpenBK7231T_QIO_XX_tuyaMCU.bin                                  1048576                    1048576
0           OpenBK7231T_UA_XX_berry.bin                                      978944                     978944
0           OpenBK7231T_UA_XX.bin                                            978944                     978944
0           OpenBK7231T_UA_XX_irRemoteESP.bin                                978944                     978944
0           OpenBK7231T_UA_XX_powerMetering.bin                              978944                     978944
0           OpenBK7231T_UA_XX_sensors.bin                                    978944                     978944
0           OpenBK7231T_UA_XX_tuyaMCU.bin                                    978944                     978944
0           OpenBK7231U_QIO_XX.bin                                          1253376                    1253376
0           OpenBK7231U_UA_XX.bin                                           1183744                    1183744
0           OpenBK7238_QIO_XX_berry.bin                                     1253376                    1253376
0           OpenBK7238_QIO_XX.bin                                           1253376                    1253376
0           OpenBK7238_QIO_XX_irRemoteESP.bin                               1253376                    1253376
0           OpenBK7238_UA_XX_berry.bin                                      1183744                    1183744
0           OpenBK7238_UA_XX.bin                                            1183744                    1183744
0           OpenBK7238_UA_XX_irRemoteESP.bin                                1183744                    1183744
0           OpenBK7252N_QIO_XX.bin                                          1253376                    1253376
0           OpenBK7252N_UA_XX.bin                                           1183744                    1183744
0           OpenBK7252_QIO_XX.bin                                           1253376                    1253376
0           OpenBK7252_Tuya_QIO_XX.bin                                      1253376                    1253376
0           OpenBK7252_Tuya_UA_XX.bin                                       1183744                    1183744
0           OpenBK7252_UA_XX.bin                                            1183744                    1183744
0           OpenRTL8720D_XX.bin                                             1044480                    1044480
0           OpenRTL8720D_XX_ota.img                                         1019936                    1019936
0           OpenXR806_XX.img                                                 868192                     868192
0           OpenXR809_XX.img                                                 921384                     921384
0           OpenXR872_XX.img                                                 798552                     798552
112         OpenBK7238_XX_berry.rbl                                          574304                     574416
128         OpenRTL87X0C_XX.bin                                              950276                     950404
128         OpenRTL87X0C_XX_ota.img                                          884740                     884868
136         OpenBL602_XX_OTA.bin.xz                                          442832                     442968
136         OpenBL602_XX_OTA.bin.xz.ota                                      443344                     443480
144         OpenXR806_XX_ota.img                                             494232                     494376
172         OpenW600_XX_gz.img                                               334824                     334996
176         OpenBK7252_XX.rbl                                                529936                     530112
176         OpenBL602_XX_berry_OTA.bin.xz                                    510632                     510808
176         OpenBL602_XX_berry_OTA.bin.xz.ota                                511144                     511320
192         OpenBK7231T_ALT_XX.rbl                                           522544                     522736
192         OpenBK7231T_UG_XX_berry.bin                                      544592                     544784
192         OpenBK7231T_XX_berry.rbl                                         544560                     544752
192         OpenBK7238_XX.rbl                                                510288                     510480
208         OpenBK7231N_ALT_XX.rbl                                           511056                     511264
208         OpenESP32_XX_4M.factory.bin                                     1063952                    1064160
208         OpenESP32_XX_4M.img                                              998416                     998624
224         OpenBK7231N_UG_XX_berry.bin                                      568144                     568368
224         OpenBK7231N_UG_XX.bin                                            503744                     503968
224         OpenBK7231N_UG_XX_powerMetering.bin                              504480                     504704
224         OpenBK7231N_XX_berry.rbl                                         568112                     568336
224         OpenBK7231N_XX_powerMetering.rbl                                 504448                     504672
224         OpenBK7231N_XX.rbl                                               503712                     503936
224         OpenBK7231U_XX.rbl                                               522944                     523168
224         OpenBK7252N_XX.rbl                                               515504                     515728
224         OpenESP32S2_XX_4M.factory.bin                                   1037936                    1038160
224         OpenESP32S2_XX_4M.img                                            972400                     972624
240         OpenBK7231T_UG_XX.bin                                            479296                     479536
240         OpenBK7231T_XX.rbl                                               479264                     479504
240         OpenECR6600_XX_ota.img                                           526833                     527073
240         OpenESP32S3_XX_4M.factory.bin                                   1063888                    1064128
240         OpenESP32S3_XX_4M.img                                            998352                     998592
256         OpenESP32C2_XX_2M.factory.bin                                    911312                     911568
256         OpenESP32C2_XX_2M.img                                            845776                     846032
256         OpenESP32C2_XX_4M.factory.bin                                   1039344                    1039600
256         OpenESP32C2_XX_4M.img                                            973808                     974064
256         OpenESP32C3_XX_4M.factory.bin                                   1145360                    1145616
256         OpenESP32C3_XX_4M.img                                           1079824                    1080080
256         OpenESP32C61_XX_4M.factory.bin                                  1177632                    1177888
256         OpenESP32C61_XX_4M.img                                          1112096                    1112352
256         OpenESP32C6_XX_4M.factory.bin                                   1240912                    1241168
256         OpenESP32C6_XX_4M.img                                           1175376                    1175632
272         OpenBK7238_XX_irRemoteESP.rbl                                    570464                     570736
272         OpenBL602_XX_OTA.bin                                             801488                     801760
272         OpenESP32C3_XX_2M.factory.bin                                   1017424                    1017696
272         OpenESP32C3_XX_2M.img                                            951888                     952160
272         OpenESP32C5_XX_4M.factory.bin                                   1232720                    1232992
272         OpenESP32C5_XX_4M.img                                           1167184                    1167456
280         OpenBL602_XX_berry.bin                                           922400                     922680
280         OpenBL602_XX.bin                                                 797384                     797664
288         OpenBK7231N_UG_XX_tuyaMCU.bin                                    502480                     502768
288         OpenBK7231N_XX_tuyaMCU.rbl                                       502448                     502736
288         OpenBK7231T_UG_XX_irRemoteESP.bin                                547216                     547504
288         OpenBK7231T_UG_XX_powerMetering.bin                              482160                     482448
288         OpenBK7231T_XX_irRemoteESP.rbl                                   547184                     547472
288         OpenBK7231T_XX_powerMetering.rbl                                 482128                     482416
288         OpenBL602_XX_berry_OTA.bin                                       926496                     926784
288         OpenRTL8710A_XX.bin                                              780076                     780364
288         OpenRTL8710A_XX_ota.img                                          735024                     735312
288         OpenRTL8720E_XX.bin                                             1401504                    1401792
288         OpenRTL8720E_XX_ota.img                                         1319616                    1319904
288         OpenW600_XX.fls                                                  549352                     549640
292         OpenXR872_XX_ota.img                                             446340                     446632
304         OpenBK7231T_UG_XX_sensors.bin                                    474128                     474432
304         OpenBK7231T_XX_sensors.rbl                                       474096                     474400
312         OpenRTL8710B_XX.bin                                              627076                     627388
317         obkSimulator_XX.zip                                             2462873                    2463190
320         OpenBK7231N_UG_XX_irRemoteESP.bin                                565328                     565648
320         OpenBK7231N_XX_irRemoteESP.rbl                                   565296                     565616
320         OpenLN882H_XX.bin                                                761676                     761996
336         OpenBK7231N_UG_XX_sensors.bin                                    496880                     497216
336         OpenBK7231N_XX.bin                                               802065                     802401
336         OpenBK7231N_XX_sensors.rbl                                       496848                     497184
360         OpenBK7231N_XX_berry.bin                                         905153                     905513
368         OpenBK7231T_XX.bin                                               769513                     769881
368         OpenBK7231T_XX_powerMetering.bin                                 753181                     753549
376         OpenBK7231N_XX_powerMetering.bin                                 783861                     784237
392         OpenBK7231T_XX_berry.bin                                         872609                     873001
416         OpenBK7231T_UG_XX_tuyaMCU.bin                                    480960                     481376
416         OpenBK7231T_XX_tuyaMCU.rbl                                       480928                     481344
416         OpenESP8266_1MB_XX.factory.bin                                   814512                     814928
416         OpenESP8266_2MB_XX.factory.bin                                   814512                     814928
416         OpenESP8266_XX.img                                               748976                     749392
540         OpenBK7238_XX_irRemoteESP.bin                                    859961                     860501
576         OpenBK7231N_XX_irRemoteESP.bin                                   901101                     901677
576         OpenBK7231T_XX_sensors.bin                                       763129                     763705
576         OpenBK7231T_XX_tuyaMCU.bin                                       751413                     751989
584         OpenBK7231N_XX_sensors.bin                                       794177                     794761
584         OpenBK7231N_XX_tuyaMCU.bin                                       780733                     781317
584         OpenBK7231T_XX_irRemoteESP.bin                                   876453                     877037
608         OpenRTL8721DA_XX.bin                                            1522368                    1522976
608         OpenRTL8721DA_XX_ota.img                                        1440480                    1441088
624         OpenRTL8710B_XX_ota.img                                         1254160                    1254784
643         OpenLN882H_XX_OTA.bin                                            430746                     431389
1156        OpenECR6600_XX.bin                                               981397                     982553
2144        OpenTR6260_XX.bin                                                654160                     656304
2272        OpenW800_XX_ota.img                                              415724                     417996
4184        OpenW800_XX.fls                                                  694236                     698420




    For both list of sizes:
    Ignore W800 here, it was my main target where dis- and enabled all those fancy clock possibilities for testing...
  • #60 21634884
    omniron
    Level 11  
    Posts: 114
    Help: 1
    Rate: 6
    max4elektroda wrote:
    Ah, I forgot you mentioned tasmota, so I expect some ESP32 variant or ESP8266?


    I used the RTC in a ESP8266 Tasmota plug
    https://templates.blakadder.com/kmc_4.html
    Best quality plugs I ever got, Tasmota and power monitoring and work to this day.

    Unfortunately later KMC 4s came with tuya chips and were really cheaply built, bad capacitors and bad design in general like most tuya stuff.

    I don't have that particular RTC unit in reach, but can mod another unit for testing.
    Trying to locate it's schematic to see which pins I used for SDA and SCL.

    GPS boards are much larger and won't fit in most existing smart units.

    So excited for your integration of RTC module into Tasmota or tuya.
    Here is a newer RTC implementaion for Tasmota, never used it, had an older trial from years ago.
    https://tasmota.github.io/docs/DS3231/#tasmota-settings_1
    That plus the option to query the RTC unit by other smart devices as a replacement for NTP will make it possible to be truly disconnected from the internet.
    Thanks again!
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Topic summary

✨ The discussion revolves around implementing a local clock in OpenBeken devices without relying on the NTP protocol. The initial approach involved using a variable to track the time since startup, allowing for time calculations based on elapsed seconds. While this method lacks the accuracy provided by NTP, it offers advantages such as independence from network connectivity and reduced resource requirements. Participants provided feedback on code structure, suggested improvements for compatibility, and discussed the potential for using real-time clocks (RTC) for enhanced accuracy. Testing across various platforms, including LN882H, BL602, and W600, was conducted to evaluate the clock's performance and reliability. The conversation also touched on daylight saving time adjustments and the possibility of remote clock synchronization.
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TL;DR: With 1–2 seconds/day drift after switching to RTOS-tick-based uptime, the thread’s core advice is: "split clock from NTP" and keep a local OpenBeken clock from startup time plus corrected elapsed seconds. This helps OpenBeken users who need offline energy stats, local scheduling, or RTC integration without internet or NTP. [#21031093]

Why it matters: A separable device clock lets OpenBeken keep usable time in AP mode, offline LANs, and future RTC-based builds, while reducing dependence on always-on internet time.

Approach Internet required Reported accuracy in thread Best fit Main limitation
Local clock from startup + corrected uptime No about 1–2 s/day daily energy totals, basic schedules loses time after power loss
NTP-based clock Yes, at least for sync network-synced precise schedules, sunrise/sunset needs reachable time source
DS3231 RTC No about 1 minute/year remote installs, outages, offline switching needs extra hardware and space

Key insight: The breakthrough was not “manual time entry” alone. It was replacing naive g_secondsElapsed++ timing with RTOS-tick-derived uptime, then separating generic clock functions from the NTP protocol layer. [#21031093]

Quick Facts

  • The first local-clock method drifted by about 2 minutes per day, but RTOS-tick correction reduced that to about 1–2 seconds per day on the author’s device. [#21031093]
  • Tick-counter overflow was discussed as an edge case, but on a 32-bit counter it appears only about every 50 days; a local 16-bit test forced overflow after about 1 minute to verify logic. [#21063405]
  • Cross-platform testing reported good results on LN882H, BK7231T/N, W600, W800, BL602, BK7238, and ESP32, although BL602 also showed separate watchdog resets during long tests. [#21062117]
  • The DS3231 path became practical later: the driver was said to be available, but not enabled by default; users must compile with #define ENABLE_DRIVER_DS3231 1. [#21865147]

How can I implement a local clock in OpenBeken without using the NTP protocol?

Implement it by storing the device’s time at startup, then adding corrected elapsed uptime to that base. The first version used one startup-time variable plus g_secondsElapsed; the improved version recalculated elapsed time from RTOS ticks every 10 seconds. That lets the clock run in AP mode and without any network. It is accurate enough for daily energy totals, even when exact wall-clock precision is unnecessary. [#21031093]

Why does g_secondsElapsed drift on some OpenBeken platforms, and how can RTOS ticks make it more accurate?

g_secondsElapsed drifts because a simple one-second increment is not equally accurate on all SDKs and platforms. The fix is to derive uptime from RTOS ticks, including platform-specific tick-to-millisecond factors such as portTICK_RATE_MS or a ratio of 2 on some Beken and WinnerMicro targets. That change fixed slow clocks on BK7231N, BK7231T, W600, and W800, and brought reported drift down to about 1–2 seconds per day. [#21046836]

What is g_secondsElapsed in OpenBeken, and how is it used for uptime and offline timekeeping?

g_secondsElapsed is OpenBeken’s uptime counter, used for status displays, JSON output, driver timing, and offline clock math. "g_secondsElapsed is an uptime counter that tracks seconds since boot, a core timing value reused for status pages, sensor intervals, and local timekeeping when combined with a saved start time." The local-clock approach turns uptime into wall time by adding a stored startup epoch. [#21036229]

How do I split OpenBeken's NTP-dependent time functions into a separate generic clock driver?

Split the code by moving generic time access out of drv_ntp.c into a separate clock layer, then leave only protocol-specific sync logic in NTP. In the thread, this meant adding files such as drv_deviceclock.c and renaming event logic toward drv_clock_events.c, while keeping feature flags optional in obk_config.h. That design also makes sunrise, DST, manual clock setting, and future RTC sources usable without forcing the NTP driver to own all time functions. [#21031093]

What is an RTC module like the DS3231, and how does it help OpenBeken keep time without internet access?

A DS3231 RTC gives OpenBeken a hardware time source that survives network loss and improves long-term accuracy. "DS3231 is a real-time clock module that stores and serves calendar time, usually with battery backup, so the device can query accurate time without internet access." In the thread, it was described as accurate to about 1 minute per year and suitable for fully offline systems. [#21034483]

Local clock vs NTP vs DS3231 RTC in OpenBeken — which approach is best for energy stats and scheduled switching?

Use the local clock for energy stats, NTP for highest convenience and precision, and DS3231 for offline switching with outages. The thread concluded that a drift of about 1 minute after a month is acceptable for daily values and many switching tasks, while NTP remains better when exact synchronization matters. DS3231 is the strongest offline option because it avoids internet dependency and keeps good accuracy through power and network interruptions. [#21062117]

How do I enable and test ENABLE_LOCAL_CLOCK and ENABLE_LOCAL_CLOCK_ADVANCED in obk_config.h?

Enable them by turning the defines on, compiling, then verifying both GUI and status output. 1. Set ENABLE_LOCAL_CLOCK 1; optionally set ENABLE_LOCAL_CLOCK_ADVANCED 1 for DST support. 2. Rebuild and flash, because the feature was submitted disabled by default. 3. Confirm that the config page shows a browser-time clock option and that status output reports time. The thread used ENABLE_LOCAL_CLOCK for basic clocking and ENABLE_LOCAL_CLOCK_ADVANCED for DST, with the advanced flag requiring the basic one. [#21032907]

Why did the OpenBeken local clock run slow on BK7231N, BK7231T, and W600, and what fixed it?

It ran slow because the code initially missed the platform tick conversion factor. On BK7231N and BK7231T, the author later found a required ratio of 2; on W600 and W800, portTICK_RATE_MS also equaled 2. After changing the uptime calculation to multiply xTaskGetTickCount() by the correct tick period, the slow-clock behavior was reported fixed across those platforms. [#21039505]

How can I query the current device time programmatically in OpenBeken, for example with STATUS 8 or HTTP requests?

Query it with OpenBeken status endpoints, especially STATUS 8, or send HTTP requests to read or set time remotely. The thread showed a shell example using wget against /cm?cmnd=STATUS%208, returning JSON with "StatusSNS":{"Time":"2024-04-07T15:05:09"}. That makes drift testing easy: poll the device at intervals and compare its reported time with a known-good router or Linux host clock. [#21036320]

What is DCF77, and how could it be used as an alternative time source for OpenBeken devices?

DCF77 can act as an offline radio time source if OpenBeken decodes its pulse timings correctly. "DCF77 is a longwave time-signal system that transmits one timing bit per second, using pulse lengths to encode time data over a one-minute frame." In the thread, a first decoder worked on W800 and ESP32, and the practical requirement was only to distinguish roughly 100 ms pulses, 200 ms pulses, and a nearly 2-second gap. [#21638397]

How should daylight saving time be implemented in OpenBeken: compile-time tables, runtime calculation, or LittleFS-based zone files?

Use runtime-configurable DST if flexibility matters; use compile-time tables only for the smallest builds. The thread started with compile-time tables, then moved toward universal DST settings inspired by Tasmota so users were no longer bound to build-time timezone choices. A LittleFS file like DST.bin was also proposed as a scalable middle ground for per-zone data without hardcoding every rule into firmware. [#21036097]

What is LittleFS in OpenBeken, and how could it store DST or timezone configuration data?

LittleFS is the lightweight on-device file storage layer proposed for keeping timezone or DST rule data outside hardcoded firmware tables. In the thread, one idea was to store a file named DST.bin and read it as a float array or fetch values as needed. That would let users upload zone-specific DST data separately, instead of recompiling for each timezone. [#21036097]

How do I use a DS3231 driver in OpenBeken to set device time from an RTC or keep the RTC synced with epoch time?

Start the driver with pins, then choose whether the RTC sets the device clock once or continuously. 1. Run startdriver DS3231 <CLK-Pin> <DATA-Pin> <optional sync>. 2. Use sync 1 to set device time from RTC at startup or 2 to refresh device time regularly. 3. Set RTC time with DS3231_SetEpoch <epoch> or a Linux request such as wget "http://<ip>/cmd_tool?cmd=DS3231_SetEpoch $(date +%s)". The thread also listed DS3231_GetTime and DS3231_GetEpoch. [#21633562]

What is the safest way to add external time hardware like a DS3231, GPS, or DCF77 module to mains-powered smart plugs?

The safest method is to avoid direct access to live mains circuitry and use only properly isolated, space-appropriate hardware. The thread explicitly warned that plug pins are often at live potential, making GPS access unsafe without optical isolation. It also noted that RTC boards may fit only if there is enough room and if you accept enclosure, compliance, and safety trade-offs inside mains-powered devices. [#21633562]

How could one OpenBeken device act as a time source for other devices on the local network when there is no NTP server available?

It can act as a practical HTTP time source, even without a built-in NTP server. The thread said another device with a good clock can send an HTTP request to set time remotely on an OpenBeken unit by IP, and that source device does not have to run OpenBeken. That enables a local-only setup where one trusted node, router, or web server distributes time to multiple devices after startup or outages. [#21038303]
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