> 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/introduction/short_description.md). # Short description The BBOB is creates a buffered link between up to 4 BBOs and a Boomerang 3 system. The unit is based on Mikrotik Hex router (RB750) running Open WRT router software. There is a dedicated BBOB application running under Open WRT, that performs all the BBOB functions. The BBOB can be used only with BBO with firmware v.2.26 and higher (with NTP). An example infrastructure is shown below: ![](/files/oeAs5sHXylg89kwzjfYh) If B3 server confirms the POSTs from BBOs the BBO Buffer just relays them and is transparent to traffic. If B3 stops confirming, BBOB stores the POSTs locally on its SD card, confirms the transmissions to BBOs and checks if B3 is back online. After B3 recovery it transmits all stored POSTs and current BBO transmissions in parallel. If there are 4 BBOs with 10 sensors each sending the readings every minute BBOB equipped with a standard 8GB SD card can back up the measurements for approx. 4 months. The BBOB configuration is stored in config.txt file on SD card which can be edited if configuration needs to be modified as described in chapter **Error! Reference source not found.**. Data are sent to B3 server in XML format via a POST. The B3 server needs to acknowledge the received POST by sending a POST back reply confirming the reception. All messages sent from or to BBOB are stored in a log file on SD card as described in chapter 3.3.2. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://help.boomerang3.com/bbo-buffer-installation-manual/introduction/short_description.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.