Hi all,
First time poster!! 
I’ve had my little setup a few weeks now and i’m hopefully slowly getting there;
- 1 x hap ac2 as my main router
2 x hap ac lite
I’ve configured all three under capsman control.
The problem i’ve got with my first gen Chromecast.
I just cannot get the setup Google Home app (on iPhone) to detect the Chromecast.
I can see the Chromecast on a wifi analyser, so its certainly there and alive on the correct 2ghz channel (channel 1)
My MikroTik trio replaced a bog standard BT SmartHub, so I know the Chromecast used to work fine on that for years.
No matter whether I use capsman or not I can’t get Chromecast to detect.
I have client forwarding enabled and also multicast-helper set to full as well as enabled upnp (three solutions i’ve read elsewhere)
I have also dabbled with adding two DNS rules for google servers to the firewall, but these made no different so i disabled them.
I’m wondering if anyone can spot anything in bit of my config that might be causing?
I’ve been at this for a few nights now and i’m baffled. 
I have no VLANS in place, everything is in a single ip range; 192.168.1.0/24
/interface wireless
# managed by CAPsMAN
# channel: 5260/20-Ceee/ac(20dBm), SSID: MikroTik-AP, CAPsMAN forwarding
set [ find default-name=wlan2 ] antenna-gain=3 band=5ghz-n/ac channel-width=\
20/40/80mhz-XXXX country="united kingdom" frequency-mode=\
regulatory-domain mode=ap-bridge multicast-helper=full name=\
wlan-downstairs--local-5ghz ssid=BTHub6-WALL wireless-protocol=802.11
# managed by CAPsMAN
# channel: 2412/20/gn(17dBm), SSID: MikroTik-AP, CAPsMAN forwarding
set [ find default-name=wlan1 ] antenna-gain=3 band=2ghz-g/n channel-width=\
20/40mhz-XX country="united kingdom" frequency=auto frequency-mode=\
regulatory-domain mode=ap-bridge multicast-helper=full name=\
wlan-downstairs-local-2ghz ssid=BTHub6-WALL wireless-protocol=802.11
/caps-man datapath
add bridge=bridge1 client-to-client-forwarding=yes local-forwarding=no name=\
datapath1
/caps-man security
add authentication-types=wpa2-psk encryption=aes-ccm group-encryption=aes-ccm \
name=security1
/caps-man configuration
add channel="2GHz - Channel 1" country="united kingdom" datapath=datapath1 \
datapath.bridge=bridge1 datapath.client-to-client-forwarding=yes \
multicast-helper=full name=2GHz-C1 security=security1 \
security.authentication-types=wpa2-psk ssid=MikroTik-AP
add channel="5Ghz - Channel 52" country="united kingdom" datapath=datapath1 \
datapath.bridge=bridge1 datapath.client-to-client-forwarding=yes \
multicast-helper=full name=5GHz-C52 security=security1 \
security.authentication-types=wpa2-psk ssid=MikroTik-AP
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface detect-internet
set detect-interface-list=LAN
/interface list member
add interface=pppoe-out1 list=WAN
add interface=bridge1 list=LAN
/interface wireless cap
#
set bridge=bridge1 discovery-interfaces=bridge1 enabled=yes interfaces=\
wlan-downstairs-local-2ghz,wlan-downstairs--local-5ghz
/ip address
add address=192.168.1.254/24 interface=bridge1 network=192.168.1.0
ip firewall address-list
add address=0.0.0.0/8 comment="Self-Identification [RFC 3330]" list=Bogons
add address=10.0.0.0/8 comment="Private[RFC 1918] - CLASS A # Check if you nee\
d this subnet before enable it" list=Bogons
add address=127.0.0.0/8 comment="Loopback [RFC 3330]" list=Bogons
add address=169.254.0.0/16 comment="Link Local [RFC 3330]" list=Bogons
add address=172.16.0.0/12 comment="Private[RFC 1918] - CLASS B # Check if you \
need this subnet before enable it" list=Bogons
add address=192.0.2.0/24 comment="Reserved - IANA - TestNet1" list=Bogons
add address=192.88.99.0/24 comment="6to4 Relay Anycast [RFC 3068]" list=\
Bogons
add address=198.18.0.0/15 comment="NIDB Testing" list=Bogons
add address=198.51.100.0/24 comment="Reserved - IANA - TestNet2" list=Bogons
add address=203.0.113.0/24 comment="Reserved - IANA - TestNet3" list=Bogons
add address=224.0.0.0/4 comment=\
"MC, Class D, IANA # Check if you need this subnet before enable it" \
list=Bogons
add address=8.8.8.8 list=Google_DNS
add address=8.8.4.4 list=Google_DNS
/ip firewall filter
add action=drop chain=forward disabled=yes dst-address-list=Google_DNS
add action=accept chain=input comment=" CAPs to CAPsMAN" dst-port=5246,5247 \
protocol=udp src-address=127.0.0.1
add action=accept chain=forward comment="defconf: accept established,related" \
connection-state=established,related
add action=drop chain=forward comment="defconf: drop invalid" \
connection-state=invalid
add action=accept chain=input port=69 protocol=udp
add action=accept chain=forward port=69 protocol=udp
add action=drop chain=forward comment=\
"defconf: drop all from WAN not DSTNATed" connection-nat-state=!dstnat \
connection-state=new in-interface="Plusnet DSL"
add action=drop chain=forward comment="Drop to bogon list" dst-address-list=\
Bogons
add action=accept chain=input protocol=icmp
add action=accept chain=input connection-state=established
add action=accept chain=input connection-state=related
add action=accept chain=input disabled=yes src-address-list=admin-access
add action=accept chain=input dst-port=21,22,23,80,443,8291 protocol=tcp \
src-address-list=192.168.1.0/24
add action=drop chain=input in-interface="Plusnet DSL"
/ip firewall nat
add action=masquerade chain=srcnat out-interface-list=WAN
/ip ssh
set allow-none-crypto=yes forwarding-enabled=remote
/ip upnp
set enabled=yes
If you need any other bits of the config please let me know… i’ve left out certain sensitive bits and also bits I don’t think relevant.
Many thanks.