Optimised request: client has item groups list of specific version already and asks about the changed one: call:

				
					{
    "id": "__ID__",
    "api": "1.0",
    "method": "hub.device.groups.list",
    "params": {
        "version": "37095e6a9af5f92895099c7ddddd3c23caface71"
    }
}