tmpip = port.pop("ip", None)
tmpsubnet = port.pop("subnetId", None)
if tmpip and tmpsubnet:
fixed_ip = {
"ip_address": tmpip,
"subnet_id": tmpsubnet,
}
port["fixed_ips"] = []
port["fixed_ips"].append(fixed_ip)

Refer to the new DM, "ip" popped out from the dict might contain multiple ip addresses defined in tosca. MC does not handle this case.