Connect Beagle AP to local network via wlan0 with no eth0

General Discussion
1

How to make a BeaglePlay AP work as
↔ <-><wlan0, SoftAp0> ↔

I have working hostapd.

With current SoftAp0.network a client has no internet access and is not getting a good ip4 address. Testing SoftAp0.network:

#[Match]
#Name=SoftAp0
#[Link]
#RequiredForOnline=no
[Network]
DHCPServer=no
DHCP=ipv4
Address=192.168.1.1/24

#IPv6AcceptRA=no
#[DHCP]
#useDomains=true
#Pool stuff ignored
#PoolOffset=64
#PoolSize=86
#PoolNetwork=192.168.1.0/24
#PoolDNS=192.168.1.1
#PoolDomain=routerfdb8ee.local
[DHCPv4]
Hostname=BPLAYAP0
UseDNS=true
UseGateway=true
[DHCPServer]
#ServerAddress=192.168.1.1
RelayTarget=192.168.1.1