{
                      "subscriptionType": "UserDistanceSubscription",
                      "clientCorrelator": "0123",
                      "referenceAddress": [
                        "acr:10.0.0.3"
                      ],
                      "monitoredAddress": [
                        "acr:10.0.0.1",
                        "acr:10.0.0.2"
                      ],
                      "distance": 100,
                      "trackingAccuracy": 10,
                      "criteria": "AllWithinDistance",
                      "checkImmediate": "true"
                  }