I am trying to do the same.
Use a MT as a wifi/ethernet bridge. But I am not able to get it to work.
I do get DHCP IP when I connect the DHCP to the Bridge, but I am not able to use any of the switch port to communicate.
Using NAT between ethernet port and wan works, but I need Bridge mode.
Here is my test config (that does not work)
/interface bridge
add fast-forward=no name=bridge1
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-b/g/n disabled=no mode=station-pseudobridge ssid=TestWifi
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/interface bridge port
add bridge=bridge1 interface=wlan1
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=ether2
/ip dhcp-client
add dhcp-options=hostname,clientid disabled=no interface=bridge1
/system routerboard settings
set silent-boot=no
I have tried all Wifi mode, but no luck to get network trough to the ethernet.
This does work, but do use NAT (and WPA2):
/interface bridge
add fast-forward=no name=bridge-internal
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
add authentication-types=wpa2-psk eap-methods="" management-protection=allowed mode=dynamic-keys name=Test1234 supplicant-identity="" wpa2-pre-shared-key=Test1234
/interface wireless
set [ find default-name=wlan1 ] disabled=no mode=ap-bridge security-profile=Test1234 ssid=Inside
add disabled=no keepalive-frames=disabled mac-address=4E:5E:0C:90:87:D6 master-interface=wlan1 mode=station multicast-buffering=disabled name=wlan2-external ssid=TestWifi wds-cost-range=0 wds-default-cost=0 wps-mode=disabled
/ip pool
add name=dhcp_pool0 ranges=192.168.88.20-192.168.88.254
/ip dhcp-server
add address-pool=dhcp_pool0 disabled=no interface=bridge-internal name=dhcp1
/interface bridge port
add bridge=bridge-internal interface=ether1
add bridge=bridge-internal interface=ether2
add bridge=bridge-internal interface=ether3
add bridge=bridge-internal interface=ether4
add bridge=bridge-internal interface=wlan1
/ip address
add address=192.168.88.1/24 interface=bridge-internal network=192.168.88.0
/ip dhcp-client
add dhcp-options=hostname,clientid disabled=no interface=wlan2-external
/ip dhcp-server network
add address=192.168.88.0/24 dns-server=192.168.88.1 gateway=192.168.88.1
/ip dns
set allow-remote-requests=yes
/ip firewall nat
add action=masquerade chain=srcnat out-interface=wlan2-external