Note that what you can do through the SDK (and vMA and its’ virtual appliance or that matter) is limited by what your ESX / ESXi license allows.
The VMware KB has more information on this: you will need at least a vSphere Essentials license for your ESXi box to use it..
If you have a free ESXi license, you will often get messages like these:
SOAP Fault:
Fault string: fault.RestrictedVersion.summary
Fault detail: RestrictedVersionFault
The Wiert Corner - irregular stream of stuff 