unhandled promise rejection

Version

Tell us which versions you are using:

• react-native-ble-manager v_latest as of 4thAug2017

• react-native react-native-cli: 2.0.1 react-native: 0.47.0

• iOS/Android v.Android 7.1.1

I have linked ble-manager library using react-native link. I followed the instructions to change minSDK version to 18.

I am getting the following Warning when I use

"BleManager.start({showAlert: false, allowDuplicates: false});"

Possible Unhandled Promise Rejection (id: 0):
TypeError: Cannot read property 'start' of undefined
TypeError: Cannot read property 'start' of undefined

I have traced the problem to the bleManager.start call in the following function in BleManager.js.

start(options) {
    return new Promise((fulfill, reject) => {
      if (options == null) {
        options = {};
      }
      console.log("Start BLE")
      bleManager.start(options, (error) => {
        if (error) {
          reject(error);
        } else {
          fulfill();
        }
      });
    });
  }

I am not sure what went wrong or how to fix it.

[virdesai]

For RN 0.47, change

public BleManagerPackage() {}

@Override
public List<NativeModule> createNativeModules(ReactApplicationContext reactApplicationContext) {
	List<NativeModule> modules = new ArrayList<>();

	modules.add(new BleManager(reactApplicationContext));
	return  modules;
}

@Override
public List<Class<? extends JavaScriptModule>> createJSModules() {
	return new ArrayList<>();
}

@Override
public List<ViewManager> createViewManagers(ReactApplicationContext reactApplicationContext) {
	return Collections.emptyList();
}

to

public BleManagerPackage() {}

@Override
public List<NativeModule> createNativeModules(ReactApplicationContext reactApplicationContext) {
	List<NativeModule> modules = new ArrayList<>();

	modules.add(new BleManager(reactApplicationContext));
	return  modules;
}

public List<Class<? extends JavaScriptModule>> createJSModules() {
	return new ArrayList<>();
}

@Override
public List<ViewManager> createViewManagers(ReactApplicationContext reactApplicationContext) {
	return Collections.emptyList();
}

[marcosinigaglia]

Try with RN 0.46, I don’t know if there are breaking changes in 0.47