Moved to doc https://www.erp5.com/P-OSIE.HowTo.Setup.Lime2.MODIO. And code ot osie-plc egg.

examples/lime2-mod-io-relay-on_off.py

-#!/usr/bin/python3
-# -*- coding: utf-8 -*-
-"""
-This is an example of connecting LIME2 + LIME2-SHIELD + MOD-IO (over UEXT) and controlling a relay (on / off).
-It's mixed with slapos / re6stnet install.
-
-
-I. prepare lime2 + lime2's shield + MOD-IO
-
-# install packages at your laptop
-root@t470:~/tmp$ apt install minicom
-
-# XXX: currently nexedi suports fro armhf only debian (slapos + re6stnet packages)
-ivan@t470:~/tmp$ wget http://images.olimex.com/release/a20/A20-OLinuXino-buster-minimal-20200601-122725.img.7z
-ivan@t470:~/tmp$ 7z e A20-OLinuXino-buster-minimal-20200601-122725.img.7z
-
-# download from https://www.balena.io/etcher/
-ivan@t470:~/tmp$ unzip ../balena-etcher-electron-1.5.95-linux-x64.zip
-ivan@t470:~/tmp$ chmod o+x balenaEtcher-1.5.95-x64.AppImage
-ivan@t470:~/tmp$ ./balenaEtcher-1.5.95-x64.AppImage
-# flash to micro-sd card the previously download image
-
-# put micro-sd card inside lime2 (not shield!)
-
-# put lime2 shield on lime2 board
-
-# charge lime2 board with 5V adaptor
-
-# connect USB cable to USB1 on lime2 board and a laptop
-
-# wait till you see a green light at the board
-root@t470:~$ minicom -D /dev/ttyACM0
-
-# username and password are olimex / olimex 
-
-# put wifi dongle (or ethernet cable) but get an ipV4 address to ssh on
-
-ssh olimex@<ipv4_address> (password: olimex)
-
-# update software
-root@a20-olinuxino:~# apt update
-root@a20-olinuxino:~# apt upgrade
-root@a20-olinuxino:~# reboot now
-
-# install python
-olimex@a20-olinuxino:~$ sudo bash
-root@a20-olinuxino:~# apt install htop tig git etckeeper vim curl python3 python3-venv python3-pip
-root@a20-olinuxino:~# python3 -m pip install --upgrade pip setuptools wheel
-root@a20-olinuxino:~# pip3 install pyA20Lime2 bitarray
-root@a20-olinuxino:~# pip3 install  -U pymodbus[twisted] click prompt_toolkit pygments
-
-# enable i2c-1 by running and selecting it (temporary step until fixed by Olimex but not needed for debian 10!)
-root@a20-olinuxino:~# olinuxino-overlay
-
-# prove it's enabled by
-root@a20-olinuxino:~# i2cdetect -r 1  # should show  0х58 is available
-
-# connect MOD-IO through UEXT cable to UEXT2 at LIME2-SHIELD and power it (12V adapter)
-
-II. finally run this script as root, you should see RELAY1's led showing green color.
-
-III. Integration with Nexedi's toolset for Wendelin 
-
-    # re6snet
-    root@a20-olinuxino:~# wget https://deploy.erp5.net/gnet/re6st && bash re6st # get re6stnet token from slapos.vifib.com 
-    root@a20-olinuxino:~# echo "default" >> /etc/re6stnet/re6stnet.conf
-    root@a20-olinuxino:~# /etc/init.d/re6stnet restart
-
-    # slapos
-    root@a20-olinuxino:~# wget https://deploy.erp5.net/slapos && bash slapos # get slapos token from slapos.vifib.com
-    
-    # OSIE-PLC daemon setup
-    ivan@t470:~$ slapos console
-    >>> release="https://gitlab+deploy-token-4:pLwtBu8TbusqZDKPUpZA@lab.nexedi.com/nexedi/osie/raw/master/slapos/software/osie-plc/software.cfg"
-    >>> supply(release, "COMP-3217")
-    
-
-"""
-
-from pyA20Lime2 import i2c
-import time
-
-RELAY_MAP = {0: 0x00,
-             1: 0x01,
-             2: 0x32,
-             3: 0x64,
-             4: 0x128}
-
-def sendI2Ccommand(code):
-    # init I2C
-    i2c.init("/dev/i2c-1")
-    i2c.open(0x58)
-    while 1:
-        try:
-            i2c.write([0x10, code])
-            break
-        except:
-            print("Failed co sent command.")
-
-    i2c.close()
-
-motor_on = False
-valve_on = False
-
-# stop all
-sendI2Ccommand(0x00)
-
-while 1:
-    command = input("Enter 1 to start motor and 2 to toggle (on/off) air valve. Enter 'q' to quit: ")
-
-    if command == "q":
-        break
-
-    try:
-        command = int(command)
-    except:
-        print("Invalid input")
-    
-    if command == 1:
-        # start motor relay
-        sendI2Ccommand(0x01)
-
-    elif command == 2:
-        #  toggle air valve relay
-        if valve_on:
-            sendI2Ccommand(0x01)
-            valve_on = False
-        else:
-            sendI2Ccommand(0x03)
-            valve_on = True
-
-# stop all
-sendI2Ccommand(0x00)
-print("Bye!")