RTC Memory ESP8266 12-E read an write

Question

What would be the right syntax for writing a variable lets say the int 100 into the RTC Memory of an ESP8266 12-E module and retrieve it after reboot or deep sleep.

Answer 1

You can use the methods from the ESP class:

    bool rtcUserMemoryRead(uint32_t offset, uint32_t *data, size_t size);
    bool rtcUserMemoryWrite(uint32_t offset, uint32_t *data, size_t size);

There's an example in the ESP8266 Core for Arduino in RTCUserMemory.ino.