// FirebaseJSON supports Arduino String, PROGMEM, flash string, std::string, char array, string literal, and sum of arduino String. // All functions supported FPSTR ...

A nibble is a 4 bit element, which can hold a value 0..15 (0x00..0x0F in HEX). It can be seen as an uint4_t type. The nibbleArray is an array that stores 2 nibbles in a byte therefore it is twice as ...