Turning off usb

power off

# echo "1-4.4.4" > /sys/bus/usb/drivers/usb/unbind

power on

# echo "1-4.4.4" > /sys/bus/usb/drivers/usb/bind

References :
Controlling a USB power supply (on/off) with linux - Stack Overflow 

Node-RED dashboard

$ cd ~/.node-red
$ npm i node-red-dashboard

http://localhost:1880/ui

References :

node-red/node-red-dashboard: A dashboard UI for Node-RED

fatal error: libxml/xpath.h: No such file or directory

# apt-get install libxml2-dev libxslt1-dev python-dev

References :

python - How to install lxml on Ubuntu - Stack Overflow

Python json.dumps 顯示中文

newjson = json.dumps(myjson, ensure_ascii=False)

References :
python 打印json格式的数据中文显示问题 - onwer3的专栏 - 博客频道 - CSDN.NET

Flask-Security example

 

References :
Flask-Security 如何Session CSRF和REST Token兼得 - 简书
Token Based Authentication with Flask-Security · Desi Penguin's Blog

Linux disabling blank screen

$ xset s off
$ xset -dpms
$ xset s noblank

References :
How to Disable the Blank Screen on Raspberry Pi (Raspbian) | HackLab

Arduino LowPower library Serial print 亂碼

Serial.flush();
LowPower.powerDown(SLEEP_1S, ADC_OFF, BOD_OFF);

References :
Low Power library messing up serial text