Avec une raspberry Pi avec RaspiOS 10, le kit Smartcitizen branché en usb sur la Pi :

Installer screen

sudo apt install screen

Identifier le port série

 ls /dev/tty.*

Avec python

sudo apt install python-pip
python -m pip install pyserial
python -m serial.tools.miniterm

--- Available ports:
---  1: /dev/ttyACM0         'ttyACM0'
---  2: /dev/ttyAMA0         'ttyAMA0'
--- Enter port index or full name: /dev/ttyACM0
--- Miniterm on /dev/ttyACM0  9600,8,N,1 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
20.0;61.0
20.0;61.0
20.0;61.0
--- exit ---

dans ce cas, le port est adéquat est /dev/ttyAMA0

Pour se connecter avec screen

screen /dev/ttyAMA0

On arrive sur le prompt du kit, taper help :

SCK > help

SCK > 
reset:       Resets the SCK
version:     Shows versions and Hardware ID
rcause:      Show last reset cause (debug)
outlevel:    Shows/sets outlevel [0:silent, 1:normal, 2:verbose]
help:        Duhhhh!!
pinmux:      Shows SAMD pin mapping status
sensor:      Shows/sets enabled/disabled sensor [-enable or -disable sensor-name] or [-interval sensor-name interval(seconds)]
read:        Reads sensor [sensorName]
control:     Control sensor [sensorName] [command]
monitor:     Continously read sensor [-sd] [-notime] [-noms] [sensorName[,sensorNameN]]
saved:       Shows locally stored sensor readings [-details] [-publish]
free:        Shows the amount of free RAM memory
i2c:         Search the I2C bus for devices
charger:     Controls or shows charger configuration [-otg on/off] [-charge on/off]
config:      Shows/sets configuration [-defaults] [-mode sdcard/network] [-pubint seconds] [-readint seconds] [-wifi "ssid" ["pass"]] [-token token]
esp:         Controls or shows info from ESP [-on -off -sleep -wake -reboot -flash]
netinfo:     Shows network information
time:        Shows/sets time [epoch time] [-sync]
state:       Shows state flags
hello:       Sends MQTT hello to platform
debug:       Toggle debug messages [-sdcard] [-espcom] [-list]
shell:       Shows or sets shell mode [-on] [-off]
mqtt:        Publish custom mqtt message ('topic' 'message')
SCK > 

Pour voir la config

SCK > config

Mode: network
Publish interval: 60
Reading interval: 60
Wifi credentials: ojete6 - 
Token: abcdef
Mac address:  4A:3F:DA:08:DE:50

Pour voir les infos réseau, taper

SCK > netinfo

Changer le hotspot wifi sur lequel le kit est connecté

SCK > config -wifi "NEWSSID" "NEWPASSWORD"

D'autres exemples sur la page de la documentation

Se détacher de la session screen

ctrl + a puis \

* Communiquer avec le shell en usb avec le kit