Wireless connection to PI4 Bullseye ad-hoc mode

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Paul Elliott 2024-7-30

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评论： Paul Elliott 2024-8-7

We have sucessfully programmed our application to run python scripts on a Pi4 when it is connected to our network via the ethernet lan connection.

We need to go to the next phase where the comptuer connects wirelessly to the PI without a network present. Matlab indicated that this was possible when we reviewed the project during the software decision proesses.

We think we need to turn the PI into a server, however we are not finding a resource with a working link that actually accomplishes this task. Any guidance or direction to links that are known to work would be greatly appreciated.

Hardware Pi4B

PI OS - bullseye

Matlab 2024a

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Paul Elliott 2024-8-2

Posting our solution for others in the future.

In a previous Pi project 8 years ago the ad hoc connection was used. We found that not to be as relevant given today's Pi OS's. Setting it up as an access point was the better documented solution.

After several trials we can were able to get this to work. Again our efforts only worked for a Pi4 and Bullseye. I stand by the notion that this is not an unexpected application. It would be nice if Matlab had a document outlining the setup, but at least could mention that configuring the PI as an access point would provide a solution when a network does not exist.

All of the Matlab briefs and documents with regard to connecting to the PI and installing the PI support package worked well. I'd advise doing that with the Pi plugged into the network via cable though. I'd also advise getting everything working in this state and then setting up the Pi as an access point. We tried a few guides that simply do not work with our combination of Pi and OS.

1- Setting up the Pi as an access point. We did this in both full and lite versions.

https://raspberrypi-guide.github.io/networking/create-wireless-access-point

2- Additional steps not covered above: 1- we found you had to set the country in both raspi-config and in the step in the above link. 2- you have to enalbe SSH in raspi-config. Other than that this worked fine. It may very well be that not all countries work. Our project used US in both and it worked though.

Maybe this will help someone down the road.

Umar 2024-8-2

Hi @Paul Elliot,

While you were going through setup issues as mentioned by you, “ It would be nice if Matlab had a document outlining the setup, but at least could mention that configuring the PI as an access point would provide a solution when a network does not exist”, did you try to reach out mathworks technical support (https://www.mathworks.com/support/contact_us.html), please let us know.

Paul Elliott 2024-8-7

I sent a note to Tech support giving them where I found the solution and reiterating that I was needing a solution where a netowrk was nonexistant.

We currently have the system working with regard to Matlab. The issues now involve the python scripts for the daqhats from MCC. There is next to no support either written or otherwise there.

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