uuid

A universally unique identifier for the connection, for example generated with libuuid.

It should be assigned when the connection is created, and never changed as long as the connection still applies to the same network. For example, it should not be changed when the id property or SettingIP4Config changes, but might need to be re-created when the Wi-Fi SSID, mobile broadband network provider, or type property changes.

The UUID must be in the format "2815492f-7e56-435e-b2e9-246bd7cdc664" (ie, contains only hexadecimal characters and "-"). A suitable UUID may be generated by uuid_generate or nm_uuid_generate_from_string_str.