I have pondered from time to time the utility and need to be able to turn the RF portion of a node completely "OFF". I have had some situations at times where that could be a useful feature for troubleshooting and some other situations. I usually deal with this "need" by moving off to an unused channel and dropping the power to the lowest level in the past. Would there be any memory saving advantages if this were possible??
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As for memory savings, probably not significant direct savings to disabling wifi, there are a few deep internal buffers that could be deallocated but I doubt they consume much. Indirectly there are a number of programs that would not have to execute if wifi was disabled and those programs may free up some small amounts of memory if disable along with the RF module.