You may wish to prefer the asynchronous version even in synchronous
command line programs because, since 2.60, it implements
RFC 8305 "Happy Eyeballs"
recommendations to work around long connection timeouts in networks
where IPv6 is broken by performing an IPv4 connection simultaneously
without waiting for IPv6 to time out, which is not supported by the
synchronous call. (This is not an API guarantee, and may change in
the future.)
This is the asynchronous version of gio.socket_client.SocketClient.connect.
You may wish to prefer the asynchronous version even in synchronous command line programs because, since 2.60, it implements RFC 8305 "Happy Eyeballs" recommendations to work around long connection timeouts in networks where IPv6 is broken by performing an IPv4 connection simultaneously without waiting for IPv6 to time out, which is not supported by the synchronous call. (This is not an API guarantee, and may change in the future.)
When the operation is finished callback will be called. You can then call gio.socket_client.SocketClient.connectFinish to get the result of the operation.