Two probs here.
ipv4 shoudl be ipv4.addresses
nmcli con add type bridge con-name Bridge0 ifname br0 ipv4.addresses "192.0.2.1/24"
Need to disable DHCP or the interface will only stay up for 60 seconds
nmcli con mod Bridge0 ipv4.method manual

Reported by: vodafone-paul

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-vlan_on_bond_and_bridge_using_the_networkmanager_command_line_tool_nmcli#annotations:edd0fbac-0482-4610-9d1f-4931fb6b687d