What are c++ data types?

Question

Arduino

Hello,
tell me what's the matter and how to simplify my rewards?
there is a variable uint8_t buffer;
and to compare it with my string this is what I need to do

String bff(reinterpret_cast<char*>(buffer));

char *cm1 = "blahblahblah";
String cmd1(cm1);
if (bff == cmd1){ ... }

why at least the comparison does not work if you declare cmd1 like this String cmd1("blahblah"); ? the essence of the task: get data through the serial port in arduino (if interested from the
esp8266 module) and compare them with my variable from the serial, an array of ascii codes is written to it, which, in general, is translated into char and string

Answer 1

1) uint8_t buffer or uint8_t *buffer?
2) if the latter, then use the memcmp function.