The MWX library provides an implementation similar to the commonly used
printf() function in C.
int mwx_printf(const char* format, ...)
int mwx_snprintf(char* buffer, size_t count, const char* format, ...)
mwx_printf() outputs formatted text to the Serial object. It performs the same processing as Serial.printfmt().
mwx_snprintf() performs snprintf formatting to a buffer.
If you want to construct a buffer using printf-style output for the array class smplbuf, refer to Generating data with
mwx::stream.