@NonNull
	Request setRequestHandler(@NonNull final RequestHandler requestHandler) {
		this.requestHandler = requestHandler;
		if (this.handler == null) {
			this.handler = requestHandler;
		}
		return this;
	}
Sets the {@link BleManager} instance.

 @param requestHandler the requestHandler in which the request will be executed.
ble/src/main/java/no/nordicsemi/android/ble/Request.java