The uuid is defined in the
    void setConnectable(void)
in UART.ino. The default is something like
    const char local_name[] = {AD_TYPE_COMPLETE_LOCAL_NAME, 'B', 'l', 'u', 'e', 'N', 'R', 'G'};

You can easily modify the code to pass your own uuid variable there.

This is so called M1.2 screw, which comes with various length. You can order at
http://www.metricscrews.us/index.php?main_page=index&cPath=98_262

Or if you can read Chinese, you can order really low cost version at
https://shop71494184.world.taobao.com/?spm=a312a.7728556.2015080705.4.OVbxvY

in the case of
      defined(ARDUINO_ARCH_SAMD)
the demo code set battery in red if the result < 325, or green otherwise.

Does this mean there is no level of scaling? I.e. result / 325 does not mean anything, unlike the case of defined(ARDUINO_ARCH_SAMD) ?

How can we get the rough % of battery for ARDUINO_ARCH_SAMD type of circuit (such as TinyScreen+) ?