Assuming you're using the default zone of "public" (you may need to temporarily disable selinux (setenforce 0)):
1. To allow everyone to access port 8080/tcp:
firewall-cmd --zone=public --add-port=8080/tcp --permanent
2. Allow a server from the IPv4 address 10.20.30.40 to access this server on port 1234 over UDP:
firewall-cmd --zone=public --add-rich-rule='rule family="ipv4" source address="10.20.30.40/32" port port="1234" protocol="udp" accept' --permanent
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