[iControl Rest]Is there any way to get the current active device and next active device name of a traffic group

I'm currently running into the same problem. The answer above is not helpful. However, you can get the failover state for each device in each traffic-group by querying /mgmt/tm/cm/traffic-group/stats. Thus, you will get a list of all traffic-group members and their respective state in each traffic-group.

BUT: I'm currently not able to query ONE specific traffic-group. Example: I have a traffic group "TG997-Test1" on two devices. When querying the path mentioned above, I get the following response:

> curl -sk -u admin:xxxxxxxx https://lb1/mgmt/tm/cm/traffic-group/stats | python -mjson.tool
{
    "entries": {
        ...
        "https://localhost/mgmt/tm/cm/traffic-group/~Common~TG997-Test1:~Common~lb1/stats": {
            "nestedStats": {
                "entries": {
                    "deviceName": {
                        "description": "/Common/lb1"
                    },
                    "failoverState": {
                        "description": "active"
                    },
                    "nextActive": {
                        "description": "false"
                    },
                    "trafficGroup": {
                        "description": "/Common/TG997-Test1"
                    }
                },
                "kind": "tm:cm:traffic-group:traffic-groupstats",
                "selfLink": "https://localhost/mgmt/tm/cm/traffic-group/~Common~TG997-Test1:~Common~lb1/stats?ver=11.6.0"
            }
        },
        "https://localhost/mgmt/tm/cm/traffic-group/~Common~TG997-Test1:~Common~lb2/stats": {
            "nestedStats": {
                "entries": {
                    "deviceName": {
                        "description": "/Common/lb2"
                    },
                    "failoverState": {
                        "description": "standby"
                    },
                    "nextActive": {
                        "description": "false"
                    },
                    "trafficGroup": {
                        "description": "/Common/TG997-Test1"
                    }
                },
                "kind": "tm:cm:traffic-group:traffic-groupstats",
                "selfLink": "https://localhost/mgmt/tm/cm/traffic-group/~Common~TG997-Test1:~Common~lb2/stats?ver=11.6.0"
            }
        },
    },
    ...
    "kind": "tm:cm:traffic-group:traffic-groupcollectionstats",
    "selfLink": "https://localhost/mgmt/tm/cm/traffic-group/stats?ver=11.6.0"
}

I see both members and their states in this traffic-groups (all other traffic-groups are also returned, the response above is shortened). But I can neither get the failover state of the members of one particular traffic group...

> curl -sk -u admin:xxxxxxxx https://lb1/mgmt/tm/cm/traffic-group/~Common~TG997-Test1/stats | python -mjson.tool
{
    "generation": 0,
    "kind": "tm:cm:traffic-group:traffic-groupstats",
    "selfLink": "https://localhost/mgmt/tm/cm/traffic-group/~Common~TG997-Test1/stats?ver=11.6.0"
}

(no useful data included)

...nor can I poll one of the entries of the "big list" above directly, although I'm following the exact path as in the respective "selfLink" value:

> curl -sk -u admin:xxxxxxxx https://lb1/mgmt/tm/cm/traffic-group/~Common~TG997-Test1:~Common~lb1/stats | python -mjson.tool
{
    "code": 404,
    "errorStack": [],
    "message": "01020036:3: The requested traffic group (/Common/TG997-Test1:/Common/lb1) was not found."
}

I think the REST API in version 11.6.0 HF6 might not yet be completed at this point. Is there anybody out there who ran into the same issue and found a solutions? Maybe, can anybody test if those queries are working with later versions (12+)? Any hint is welcome. Thanks in advance!