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+# HS2 Workflow
+
+## import HS2 module
+
+```js
+import {
+  HS2Module,
+  HSProfileModule
+} from '@ihealth/ihealthlibrary-react-native';
+```
+
+## APIs
+
+### add and remove listener
+
+```js
+// add
+notifyListener = DeviceEventEmitter.addListener(HS2Module.Event_Notify,  (event) => {
+    console.log(event);
+});
+
+// remove
+notifyListener.remove();
+```
+
+### start a measurement
+
+The API is asyn function. It will return message until finish measurement.
+
+```js
+HS2Module.startMeasure(mac);
+
+notifyListener = DeviceEventEmitter.addListener(HS2Module.Event_Notify,  (event) => {
+    if (event.action === HSProfileModule.ACTION_ONLINE_RESULT_HS) {
+        console.log(event[HSProfileModule.DATAID]);
+        console.log(event[HSProfileModule.WEIGHT_HS]);
+        console.log(event[HSProfileModule.FAT_HS]);
+        console.log(event[HSProfileModule.WATER_HS]);
+        console.log(event[HSProfileModule.MUSCLE_HS]);
+        console.log(event[HSProfileModule.SKELETON_HS]);
+        console.log(event[HSProfileModule.FATELEVEL_HS]);
+        console.log(event[HSProfileModule.DCI_HS]);
+    }
+});
+```
+
+### get data stored in the HS2 device
+
+```js
+HS2Module.getOfflineData(mac);
+
+notifyListener = DeviceEventEmitter.addListener(HS2Module.Event_Notify,  (event) => {
+    if (event.action === HSProfileModule.ACTION_HISTORICAL_DATA_HS) {
+        let dataArray = event[HSProfileModule.HISTORDATA_HS];
+        if (dataArray == undefined) {
+            result = "There is not offline data in device"
+        }else {
+            for (let i = 0; i < dataArray.length; i++) {
+                let offlineData = dataArray[i];
+                console.log(offlineData[HSProfileModule.MEASUREMENT_DATE_HS]);
+                console.log(offlineData[HSProfileModule.WEIGHT_HS]);
+                console.log(offlineData[HSProfileModule.FAT_HS]);
+                console.log(offlineData[HSProfileModule.WATER_HS]);
+                console.log(offlineData[HSProfileModule.MUSCLE_HS]);
+                console.log(offlineData[HSProfileModule.SKELETON_HS]);
+                console.log(offlineData[HSProfileModule.FATELEVEL_HS]);
+                console.log(offlineData[HSProfileModule.DATAID]);
+            }
+        }
+    }
+});
+```
+
+### disconnect device
+
+```js
+BP3LModule.disConnect(mac);
+```
+
+### get all connected devices
+
+```js
+BP3LModule.getAllConnectedDevices();
+```