> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/bbo-buffer-installation-manual/advanced_use/buffering-check.md).

# Buffering check

The check of BBOB buffering may be needed e.g. during system Operation Qualification.

This method requires the bbobuffer app version 1.0.3 or higher. You may check the version in BBOB web interface in 'System - Software', Installed tab.

<figure><img src="/files/NtNenS8ZP0s7QbsnkzDI" alt=""><figcaption></figcaption></figure>

To check use the method described below:

1. Connect with Putty.
2. Change the B3 server URL in mnt/sd/config.txt to a non existing address so BBOB will not be able to send the readings to B3.
3. Connect to the BBOB web interface.
4. Go to 'Status - Processes'.
5. Look for a process called bbobuffer and click 'Terminate' to stop bbobuffer process.&#x20;

<figure><img src="/files/MSHTPcjNFA5forDJINcw" alt=""><figcaption></figcaption></figure>

The process will be restarted automatically by run.sh (you do not need to do anything), with new config.txt settings. The B3 settings will be incorrect now so the data files shall be created in the mnt/sd/backup directory when the data from BBO(s) are received.

<figure><img src="/files/zo24vku2gf43922RUKHH" alt=""><figcaption></figcaption></figure>

6. Once you can see buffered data files, you can change the B3 URL to a correct address and terminate bbobuffer again to restart it with the correct settings.
7. The Backup data files shall be transmitted to B3 after a while and there shall be no missing readings in the system.


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