Colibri IMX8X Wifi IEEE 802.11ac

Technical Support
, , ,
8

Hello @josep.tx ,

Sorry for getting back to you so late.
I was able to try the solution proposed by @Edward.

It created a hostapd.conf very similar to what I did before and I was able to get WiFi 5 working (5 Ghz, > 100 Mbps). I measured real world speeds of around 70 Mbps between the SoM and a smartphone connected to it’s AP which is enough for our application.

I believe I originally had multiple problems with WiFi authentication (WPA2 PSK), the bridge network and the DHCP which is why my original configuration did not work.

Finally we had another problem that we discovered later: we had WiFi drops that lasted multiple seconds. It turns out that was caused by the periodic WiFi scans of NetworkManager on interface mlan0. We fixed the problem by removing the mlan0 interface from NetworkManager since we do not ever need to connect to a WiFi network.

I have attached the final, isolated network configuration that we arrived at:
filesystem_network.zip (5.0 KB)

It does the following

  • Create a bridge network br0
  • Attach a dhcp server to br0 and sets the SoM address to 10.42.0.1
  • Create a WiFi 5 access point and set it up to start at boot
  • Bridge ethernet0 and the access point together
  • Prevent NetworkManager from managing either uap0 or mlan0

Now we can access the SoM at address 10.42.0.1 no matter if we’re connected via Ethernet or WiFi.

Thank you everyone for your help.
Kind regards,
Corentin.