How to make sure JS Modules are loaded before sending message from ReactActivity via JS bridge?

In my react app the MainActivity(subclass of ReactActivity) is launched from the subclass of BroadcastReceiver. From the MainActivity::onCreate method a message to JS Module is emitted through JS bridge which gets lost. From the logs it looks like the JS Module gets mounted after the message is sent from MainActivity::onCreate() method.

ExampleReceiver.java

public class ExampleReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent service = new Intent(context, ANService.class);
        service.putExtras(intent);
    service.setClassName("com.example", "com.example.MainActivity");
        service.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(service);
    }
}

MainActivity.java

public class MainActivity extends ReactActivity {
    ...
    ...
  @Override
  protected void onCreate (Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      Log.d(TAG, "onCreate -> MainActivity -> ReactActivity");
      try {
      JSONObject data = BundleJSONConverter.convertToJSON(getIntent().getExtras());
      Log.d(TAG, data.toString());
          getReactInstanceManager().getCurrentReactContext().getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class).emit("onExampleMessage", data.toString());
      } catch (Exception e) {
          System.err.println("Exception when handling notification openned. " + e);
      }
  }
}

ExampleJSComponent.js

export default class ExampleJSComponent extends Component
{
    componentDidMount() {
    console.log('ExampleJSComponent componentDidMount');

    DeviceEventEmitter.addListener('onExampleMessage', async function(e) {
        const obj = JSON.parse(e);
        console.log(obj);
    });
    }
}

Adb logcat Logs:
...
...
D MainActivity: onCreate -> MainActivity -> ReactActivity
...
...
I ReactNativeJS: in index.js
I ReactNativeJS: ExampleJSComponent componentDidMount

The following line does not ensure the JS components are mounted.

getReactInstanceManager().getCurrentReactContext().getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)

How to make sure the JS component is mounted before sending message from the MainActivity::onCreate method ?