Problems solved here:
- Connecting to a wireless network on Ubuntu Server 21.04 and Raspberry Pi 4
- Prefer 5 GHz WiFi when 2.4 GHz exists with the same SSID
Add the wifi network configuration to /etc/netplan/50-cloud-init.yaml. Looks like this file is generated by netplan somehow and there's probably a better way but this persists through restarts so it's good enough for now.
$ sudo vim /etc/netplan/50-cloud-init.yaml
network:
ethernets:
eth0:
dhcp4: true
optional: true
version: 2
wifis:
wlan0:
optional: true
dhcp4: true
access-points:
"{{WIFI NAME}}":
password: "{{WIFI PASSWORD}}"
Raspberry Pi should connect to the network after restarting.
Next problem: It is preferring the 2.4 GHz wifi over 5 GHz. Or at least it was for me.
We need to hardcode the basic service set identifier (BSSID) of 5 GHz network in the above configuration.
Find out the BSSID for the 5 GHz network:
# Will not return results without sudo
$ sudo iwlist wlan0 scan
In the output, look for an entry like this for the 5 Ghz network:
Cell 01 - Address: 2C:FD:A1:DD:D3:34
Channel:36
Frequency:5.18 GHz (Channel 36)
Quality=56/70 Signal level=-54 dBm
Encryption key:on
ESSID:"{{WIFI NAME}}"
The thing after Address: is the BSSID.
Add it to /etc/netplan/50-cloud-init.yaml on same indentation level as password.
network:
ethernets:
eth0:
dhcp4: true
optional: true
version: 2
wifis:
wlan0:
optional: true
dhcp4: true
access-points:
"{{WIFI NAME}}":
password: "{{WIFI PASSWORD}}"
bssid: "2C:FD:A1:DD:D3:34"
Done. Restart and Raspberry Pi should connect to the 5 Ghz network.
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