问题
My scenario is: Another (whatever app it is) try to retrieve the value from a Bluetooth device, But Bluetooth device doesn't send data other than our application. Another application wants Bluetooth data it needs to call our app in background mode to perform an operation also in the background. In short: Retrieve data from Bluetooth in the background and share that content to another application.
If I tried using Custom URL it's open our application into the foreground. So, this one not covers our expectation.
Is that possible with Widget kind of? or any other method.
If any info missed let me know to understand my scenario.
来源：https://stackoverflow.com/questions/47832681/how-to-retrive-data-from-bluetooth-when-app-in-background-ios