Asynchronously calls method with params on the remote peer.
Upon completion or failure, callback is executed and it should call [[email protected]_finish] to complete the request and
release any memory held.
If params is floating, the floating reference is consumed.
| this |
A Client |
| method |
The name of the method to call |
| cancellable |
A Cancellable or null |
| callback |
a callback to executed upon completion |
| params |
A [[email protected]] of parameters or null |
| user_data |
user data for |