Write a byte to the EEPROM. The value is written only if differs from the one already saved at the same address.
address: the location to write to, starting from 0 (int)
value: the value to write, from 0 to 255 (byte)
An EEPROM write takes 3.3 ms to complete. The EEPROM memory has a specified life of 100,000 write/erase cycles, so using this function instead of write() can save cycles if the written data does not change often
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