EEE8089 M2M Technology IoT Assignment Questions

Published: 25 Apr, 2025
Category Assignment Subject Computer Science
University - Module Title EEE8089 M2M Technology IoT

Part 1 of the practical coursework focuses on

  • network architecture
  • access from home
  • design problems to solve
  • (Part 2 in a separate lecture)

Three Architectures

Three main architectures are defined:

  • Target Architecture—the main design effort
  • Instrumental Architecture—pre-configured to provide access to the components of the design
  • Access From Home Architecture—a scheme for accessing the above two configurations remotely

Device Configuration

    Four RPi 3B+ devices, replace # with group number,
    multiple names for the devices with several OS images:
    
    ManagerPi#
    MasterRig#2x: MyRig#25, MyRig#26, MyRig#27, MyRig#28
    MasterRig#3x: MyRig#35, MyRig#36, MyRig#37, MyRig#38
    MasterRig#4x: MyRig#45, MyRig#46, MyRig#47, MyRig#48
    Note: the last three are often referred to as RigPi

EEE8089 M2M Technology IoT Assignment Questions

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IP Addresses for Groups

Group ManagerPi MyRig#2i MyRig#3i MyRig#4i
1 192.168.21.1 192.168.21.2
192.168.112.3
192.168.113.4 192.168.112.2
192.168.113.3
2 192.168.22.1 192.168.22.2
192.168.122.3
192.168.123.4 192.168.122.2
192.168.123.3
3 192.168.23.1 192.168.23.2
192.168.132.3
192.168.133.4 192.168.132.2
192.168.133.3
4 192.168.24.1 192.168.24.2
192.168.142.3
192.168.143.4 192.168.142.2
192.168.143.3
5 192.168.25.1 192.168.25.2
192.168.152.3
192.168.153.4 192.168.152.2
192.168.153.3
6 192.168.26.1 192.168.26.2
192.168.162.3
192.168.163.4 192.168.162.2
192.168.163.3

Tasks to Complete

  • Find the IP addresses, define the LANS and determine which gateways to use.
  • Configure the devices, test them, and debug any problems.
  • Test the connectivity: each device should be able to talk to any other, and www.
  • Use tcpdump to examine Ethernet, IP and TCP packets, and find the key fields in the headers of these packets.
  • Examine the latency and throughput of connections within one LAN, between two LANS and between three LANS.
  • Generate and distribute SSH keys between the devices, so SSH sessions can be started without typing a password. Experiment with forwarding a data pipeline through SSH between two devices.

Instrumental Architecture

Group ManagerPi# MasterRig#2x MasterRig#3x MasterRig#4x
Group 1 192.168.21.1 192.168.21.2 192.168.21.3 192.168.21.4
Group 2 192.168.22.1 192.168.22.2 192.168.22.3 192.168.22.4
Group 3 192.168.23.1 192.168.23.2 192.168.23.3 192.168.23.4
Group 4 192.168.24.1 192.168.24.2 192.168.24.3 192.168.24.4
Group 5 192.168.25.1 192.168.25.2 192.168.25.3 192.168.25.4
Group 6 192.168.26.1 192.168.26.2 192.168.26.3 192.168.26.4

Using the Instrumental Architecture

  • Get SSH access to ManagerPi# by using Access From Home Architecture.
  • From ManagerPi access RigPi devices – they are running in MasterRig mode.
  • Each MasterRig device can be logged in as user pi with provided password.
  • The OS images of MyRig (four spares per device) are mounted as ~/rootfs5…8.
  • Edit the chosen OS image, then reboot RigPi into this image (MyRig mode) by creating a file ~/boot_5 (or 6,7,8) and then rebooting the device.
  • The next reboot will take you back into the MasterRig mode.

Instrumental Architecture IP Addresses

Group ManagerPi# MasterRig#2x MasterRig#3x MasterRig#4x
Group 1 192.168.21.1 192.168.21.2 192.168.21.3 192.168.21.4
Group 2 192.168.22.1 192.168.22.2 192.168.22.3 192.168.22.4
Group 3 192.168.23.1 192.168.23.2 192.168.23.3 192.168.23.4
Group 4 192.168.24.1 192.168.24.2 192.168.24.3 192.168.24.4
Group 5 192.168.25.1 192.168.25.2 192.168.25.3 192.168.25.4
Group 6 192.168.26.1 192.168.26.2 192.168.26.3 192.168.26.4

Hardware Reboot of MyRig

If the network connection to the MyRig fails, then hardware reboot is possible by issuing a command from ManagerPi.

Soft Reboot (for MyRig#2x device)

    echo 0 > /sys/class/gpio/gpio17/value
    echo 1 > /sys/class/gpio/gpio17/value

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Hard Reboot (may cause filesystem corruption—try to avoid)

    echo 0 > /sys/class/gpio/gpio27/value
    echo 1 > /sys/class/gpio/gpio27/value

MyRig#2i: soft reboot gpio17, hard reboot gpio27

MyRig#3i: soft reboot gpio22, hard reboot gpio10

MyRig#4i: soft reboot gpio9, hard reboot gpio11

EEE8089 M2M Technology IoT Assignment Questions

Using from Home

Everywhere below, replace # with your group number.

Set up the ssh tunnels to import the ports from unix.ncl.ac.uk
    Group #: 10#22, 10#80
    
Log in to ManagerPi#
    ssh -Y -p 10#22 login_name@localhost
   
 

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