Refactor ESP32Board.h to save ~500 bytes of DRAM #1532
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saves ~500 bytes of dram and allows Tbeam to compile again
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Instead of calling esp_wifi_get_mode() we can set a flag to inhibit sleep when calling wifi.begin(), and check it before going to sleep.
This saves ~500 bytes of DRAM and allows Tbeam to compile again, fixes #1526
I'll mark this as draft until I can confirm it works as intended, but my reading of the docs for esp_wifi_get_mode() suggests it should be fine.