make: pip-compile: Command not found

# pip install pip-tools

References :
nvie/pip-tools: A set of tools to keep your pinned Python dependencies fresh.

Nokia 603 hard reset

同時按住 Menu (the front center key) + Volume down + Camera 鍵，接著按下開機鍵

開機後三鍵按住不放，直至開始恢復原廠設定




References :
Nokia 603 Hard reset - YouTube

Raspberry Pi DS3231 RTC clock

# vi /boot/config

dtparam=i2c_arm=on

# modprobe i2c-bcm2708
# echo ds3231 0x68 | sudo tee /sys/class/i2c-adapter/i2c-1/new_device

# vi /etc/rc.local

echo ds3231 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
hwclock -s

References :
DS3231 RTC 高精度時鐘模組 適用 Raspberry Pi 樹莓派全系列開發板 - 台灣物聯科技 TaiwanIOT Studio
Linux學習筆記: raspberry pi 安裝 DS3231 RTC時鐘模組
Configuring I2C | Adafruit's Raspberry Pi Lesson 4. GPIO Setup | Adafruit Learning System

wpa_supplicant log file

$ tail -f /var/log/daemon.log

fatal error: sqlite3.h: No such file or directory

$ sudo apt-get install libsqlite3-dev

References :
compilation - fatal error: sqlite3.h: No such file or directory - Stack Overflow 

Expose ssh service from private to public network by ngrok

Server:

Signup and go to Auth

$ ./ngrok authtoken YOUR_AUTH_TOKEN
$ ./ngrok tcp 22

Client:

$ ssh user@0.tcp.ngrok.io -p36428

Raspberry Pi Wifi Adapter

# vi /etc/network/interfaces

auto wlan0
iface wlan0 inet dhcp
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

# ifup wlan0

References :
Edimax EW-7811UN Wifi dongle on Raspbian
Gentoo Forums :: 觀看文章 - [Solved] WPA_Supplicant issues