https://www.itead.cc/blog/how-to-use-nextion-to-work-with-raspberry-pi
https://github.com/itead/Segnix



sudo raspi-config

Interfacing options

Serial

terminal shell: No
serial enabled: Yes

reboot

pi@raspberrypi:~ $ cd code/
pi@raspberrypi:~/code $ ls
Adafruit_Python_SSD1306  bbt  i2c  mosquitto  opc-ua
pi@raspberrypi:~/code $ git clone https://github.com/itead/Segnix.git
pi@raspberrypi:~/code $ cd Segnix/
pi@raspberrypi:~/code/Segnix $ make Raspberry_Pi_Model_BPlus

pi@raspberrypi:~ $ ps aux | grep stat
root       242 23.2  2.5  16648 11480 ?        S    19:26   2:37 python3 /home/pi/code/Adafruit_Python_SSD1306/examples/stats.py
pi       10090  0.0  0.4   4364  2096 pts/1    S+   19:37   0:00 grep --color=auto stat

pi@raspberrypi:~ $ sudo kill 242

pi@raspberrypi:~/code/Segnix $ make
pi@raspberrypi:~/code/Segnix $ sudo make install
pi@raspberrypi:~/code/Segnix $ sudo make SDK_Python_install
pi@raspberrypi:~/code/Segnix $ segnix -v
Segnix v2.9.8

mkdir ino
mkdir CompButton

pi@raspberrypi:~/code/Segnix/ino/CompButton $ cd /home/pi/code/Segnix/ino/CompButton

wget https://github.com/itead/Segnix/raw/master/libraries/itead_Nextion/examples/CompButton/CompButton.ino
pi@raspberrypi:~/code/Segnix/ino/CompButton $ segnix CompButton CompButton.ino 

pi@raspberrypi:~/code/Segnix/ino $ cd /home/pi/code/Segnix/ino
pi@raspberrypi:~/code/Segnix/ino $ mkdir CompDualStateButton
pi@raspberrypi:~/code/Segnix/ino $ cd CompDualStateButton/
pi@raspberrypi:~/code/Segnix/ino/CompDualStateButton $ wget https://raw.githubusercontent.com/itead/Segnix/master/libraries/itead_Nextion/examples/CompDualStateButton/CompDualStateButton.ino
pi@raspberrypi:~/code/Segnix/ino/CompDualStateButton $ segnix CompDualStateButton CompDualStateButton.ino 

pi@raspberrypi:~/code/Segnix/ino/Rpi_Nextion_00 $ segnix Rpi_Nextion_00_b Rpi_Nextion_00_b.ino 
compile by .ino
pi@raspberrypi:~/code/Segnix/ino/Rpi_Nextion_00 $ sudo ./Rpi_Nextion_00_b