Your application, "Swift" (or something like that), uses a 3rd party adoDB library to access MySQL. It's simply warning you there's a slight difference between the client on the server that it's using, and the client it's expecting to use.
Given that the number expected is less than the installed client, I think it probably just indicates that your application is aging a bit.
I'm not sure this is a very serious problem.
You can query the server version with this SQL statement:
mysql> SELECT VERSION();
You can obtain the client version with this statement:
mysql> STATUS;
... however, this may only work in certain types of clients (I can verify that it runs in the CLI MySQL clients that I have available on both Linux and BSD).
HTH,
