Mikrotik RB493G + Unifi AP, public and guest network

1. Go to Unifi Controller Web page, sign in.
2. Open settings => Wireless Networks => Create

3. Select Security: Open, tick Guest Policy checkbox,
tick Use VLAN ID and for example put 200 for VLAN ID, click Create
4. Now open WinBox for Mikrotik setup

for my simple setup i've created bridge bridge1 for LAN, with this parameters:

 0  R name="bridge1" mtu=1500 l2mtu=1520 arp=enabled 
      mac-address=00:0C:42:A7:68:EC protocol-mode=none priority=0x8000 
      auto-mac=yes admin-mac=00:00:00:00:00:00 max-message-age=20s 
      forward-delay=15s transmit-hold-count=6 ageing-time=5m 

Ports 1-2 configured as WAN, 3-4 not connected, 5 connected with Unifi AP, 6-9 configured as LAN ports, 6-8 ports have 9 port as master port.

 0 R  ;;; WAN1
      name="isp1" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:E4 arp=enabled auto-negotiation=yes full-duplex=yes speed=100Mbps master-port=none bandwidth=unlimited/unlimited switch=switch1 
 1 R  ;;; WAN2
      name="isp2" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:E5 arp=enabled auto-negotiation=yes full-duplex=yes speed=100Mbps master-port=none bandwidth=unlimited/unlimited switch=switch2 
 2    name="ether3" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:E6 arp=enabled auto-negotiation=yes full-duplex=yes speed=1Gbps master-port=none bandwidth=unlimited/unlimited switch=switch2 
 3    name="ether4" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:E7 arp=enabled auto-negotiation=yes full-duplex=yes speed=1Gbps master-port=none bandwidth=unlimited/unlimited switch=switch2
 4 R  ;;; Unifi AP
      name="ether5" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:E8 arp=enabled auto-negotiation=yes full-duplex=yes speed=1Gbps master-port=none bandwidth=unlimited/unlimited switch=switch2 
 5 RS ;;; homeserver
      name="ether6" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:E9 arp=enabled auto-negotiation=yes full-duplex=yes speed=1Gbps master-port=ether9 bandwidth=unlimited/unlimited switch=switch1 
 6 RS ;;; switch
      name="ether7" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:EA arp=enabled auto-negotiation=yes full-duplex=yes speed=1Gbps master-port=ether9 bandwidth=unlimited/unlimited switch=switch1 
 7 RS ;;; switch
      name="ether8" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:EB arp=enabled auto-negotiation=yes full-duplex=yes speed=1Gbps master-port=ether9 bandwidth=unlimited/unlimited switch=switch1 
 8 R  ;;; switch
      name="ether9" mtu=1500 l2mtu=1520 mac-address=00:0C:42:A7:68:EC arp=enabled auto-negotiation=yes full-duplex=yes speed=1Gbps master-port=none bandwidth=unlimited/unlimited switch=switch1

For Unifi AP Guest Network create VLAN with VLAN ID: 200

 0 R  ;;; Wifi Unifi Guest Network
      name="vlan1" mtu=1500 l2mtu=1516 mac-address=00:0C:42:A7:68:EC arp=enabled 
      vlan-id=200 interface=bridge1 use-service-tag=no 

Ports 5 (Unifi AP) and 9 (LAN Master-port) added to bridge1

 #    INTERFACE                  BRIDGE                 PRIORITY  PATH-COST    HORIZON
 0    ether5                     bridge1                    0x80         10       none
      ether9                     bridge1                    0x80         10       none

Create two DHCP Servers with two IP Pools, one for bridge1 and second for vlan1 interface.

DHCP Servers:
 0   name="lan-dhcp" interface=bridge1 lease-time=1d address-pool=dhcp_pool1 bootp-support=static authoritative=after-2sec-delay
 1   name="guest-dhcp" interface=vlan1 lease-time=3d address-pool=dhcp_guestpool1 bootp-support=static authoritative=after-2sec-delay

DHCP Pools:
 0 name="dhcp_pool1" ranges=192.168.1.110-192.168.1.150 
 1 name="dhcp_guestpool1" ranges=192.168.2.110-192.168.2.150 

Assign addresses for bridge1 and vlan1 interfaces.

 0   address=192.168.1.1/24 network=192.168.1.0 interface=bridge1 actual-interface=bridge1 
 1   address=192.168.2.1/24 network=192.168.2.0 interface=vlan1 actual-interface=vlan1

And last thing setup WAN interface and masquarading. In Unifi Controller for Guest AP you can turn on simple authentification or hotspot, which can be customized:
Mac: /Applications/UniFi.app/Contents/Resources
Windows: "%userprofile%/Ubiquiti Unifi"
Linux: /usr/lib/unifi