RPi 4B+ ethernet and wlan bridge config for netplan

10-eth-wlan-bridge.yaml

network:
  ethernets:
    eth0:
      match:
        driver: bcmgenet smsc95xx lan78xx
      set-name: eth0
      dhcp4: false
      dhcp6: false

  wifis:
    wlan0:
      dhcp4: false
      dhcp6: false
      access-points:
        "YOUR_SSID":
          password: "YOUR_PASSWORD"

  bridges:
    br0:
      dhcp4: no
      dhcp6: yes
      addresses: [192.168.N.N/23]
      routes:
        - to: default
          via: 192.168.N.M
      interfaces: [eth0,wlan0]
      mtu: 1500
      nameservers:
        addresses: [X.X.X.X,Y.Y.Y.Y]
      parameters:
        stp: true
        forward-delay: 4