IotcCampaignId represents the campaign identifier.
Campaign identifier is any string with a maximum length of
IOTC_UUID_SIZE - 1. It is provided by the VMware server as a response to an agent API or server API, or through campaign callbacks. A campaign identifier could be in the GUID format such as
123e4567-e89b-12d3-a456-426655440000, or any string such as
5b1656704cedfd000626bcaa.
