A mock environment that can be used to test the behavior of the Central Manager.
The maximum supported ATT MTU. This defaults to 23 bytes and can be extended to 517 bytes (512 bytes for the payload, 2 octets for handle number, 2 for the offset and 1 for the op code).
The maximum supported Link Layer MTU. This defaults to 27 bytes and can be extended to 251 with Data Length Extension (DLE).