Strstr function on ESP32

Even better is to know the difference between

char* inputbad = "hello";
char inputgood[] = "hello";

byte* output = (byte*) inputgood; // Won't crash

And always use const where appropriate!

BTW: On the Uno, you get at least the warnings:

warning: invalid conversion from 'byte* {aka unsigned char*}' to 'const char*' [-fpermissive]
warning: invalid conversion from 'char*' to 'byte* {aka unsigned char*}' [-fpermissive]