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# ECG3 Workflow
## import ECG3 module
```js
import {
ECGModule,
ECGProfileModule
} from '@ihealth/ihealthlibrary-react-native';
```
## APIs
### add and remove listener
```js
// add
notifyListener = DeviceEventEmitter.addListener(ECGModule.Event_Notify, (event) => {
console.log(event);
});
// remove
notifyListener.remove();
```
### get all connected devices
```js
ECGModule.getAllConnectedDevices();
```
### start a measurement
```js
ECGModule.startMeasure(mac);
// response
notifyListener = DeviceEventEmitter.addListener(ECGModule.Event_Notify, (event) => {
if (event.action === ECGModule.ACTION_ELECTRODE_STATUS) {
console.log(event[ECGProfileModule.ELECTRODE_STATUS]);
console.log(event[ECGProfileModule.ERROR_DESCRIPTION_ECG]);
}
});
```
### cancel a measurement
```js
ECGModule.stopMeasure(mac);
```
### get battery
```js
ECGModule.getBattery(mac);
// response
notifyListener = DeviceEventEmitter.addListener(ECGModule.Event_Notify, (event) => {
if (event.action === ECGModule.ACTION_BATTERY_ECG) {
console.log(event[ECGProfileModule.BATTERY_ECG])
}
});
```
### set current time to device
```js
ECGModule.sysTime(mac);
```
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