If you are using rtcmem to store values that you want to keep after a node restart, you may find that after a node restart values stored in slots 1 to 9 goes to 0, instead maintaining the stored value.
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The problem only happens if you are using rtcmem slots 0 to 9 and you have in place the rtctime module, that require slots 0 to 9. Other slots works as expected.
If you do not have rtctime, you can use slots 0 to 9 without problems.
If you are using rtcfifo module, there are other dependencies.
From my point of view, this dependencies of other modules should be documented in rtcmem module.
eHc
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"should be documented" - it _is_: https://nodemcu.readthedocs.io/en/latest/modules/rtctime/ – Marcel Stör Jan 22 '19 at 22:05
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I don't agree with you. if you are not using rtctime, you may miss the fact that slots 0 to 9 of rtcmem are reserved for rtctime usage (and some other for rtcfifo). This is what happened to me: I loaded rtctime for future use, and the behavior of rtcmem changed. This dependencies should be documented in rtcmem docs. – eHc Jan 23 '19 at 11:24
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Ok, fair enough. PR to that end are more than welcome. – Marcel Stör Jan 23 '19 at 13:30