Device Under Test - fully controllable online

[gligorisaev]

Building a setup which will provide running different tests manually or by Robot Framework Test Suites.

• DUT should be accessable online
• The SD Card of the DUT should be accessable online in order to be burned with needed image files (.img)
• The DUT should be turned ON/OFF remotely to ensure new load of SD Card with new image

[gligorisaev]

Implemented solution:

• DUT should be accessable online:

  • DUT is member of the ZeroTier Network with the IP: 192.168.193.109

• The SD Card of the DUT should be accessable online in order to be burned with needed image files (.img)

  • The SD card is inserted in the USD SD Mux device which provides two connections, to the HOST and to the DUT Host is accessable online:

    • ssh [email protected] (ssh public key needs to be provided)
    • ssh 192.168.193.87 over ZeroTier network, the Machine that runs the test must be member of the ZeroTier network as well.

  • Switching the SD card is done by running following commands:

    • sudo venv/bin/usbsdmux /dev/sg0 dut to use it with the DUT
    • sudo venv/bin/usbsdmux /dev/sg0 host to use it with the Host

• The DUT should be turned ON/OFF remotely to ensure new load of SD Card with new image

  • Tuning the DUT ON and OFF can be done by sending following MQTT messages
    • mosquitto_pub -h 192.168.193.87 -t cmnd/sonoff_switch /POWER -m "ON"
    • mosquitto_pub -h 192.168.193.87 -t cmnd/sonoff_switch /POWER -m "OFF"

• Creating backup image of the SD Card:

  • Identify the SD Cardlsblk
    • Look for a device that matches the size of your SD card. It will typically be something like /dev/sdX (where X is a letter, such as a, b, c, etc.).
  • Unmount the SD Cardsudo umount /dev/sda1 & sudo umount /dev/sda2
    • Replace /dev/sdX1 with the appropriate partition identifier if it's mounted.
  • Create the Backup sudo dd if=/dev/sda of=~/sdcard_backup.img bs=4M status=progress

• Restoring backup image to the SD Card

  • sudo dd if=~/sdcard_backup.img of=/dev/sda bs=4M status=progress

IMPORTANT:

• The SD Card switch to DUT must be done after the DUT was switched off (after the switch turn it on.
• The Restoring takes longer time than the Backup