Core-bluetooth - Is it possible to do a synchronous read?

Question

I'm building a IoT device and I have asynchronous reads working great, but I need to perform a synchronous read. I've been told this is possible on Android as there is a method that basically reads the buffer as it comes in.

I'm wondering if Core-bluetooth supports something similar or if anyone has a clever approach to this?

Answer 1

Any asynchronous operation can be made synchronous by blocking until the operation completes. You can use a queue or a lock to block.

NSLock *lock = [[NSLock alloc] init];
[thing doSomethingAsynchronousWithCompletion:^{
     [lock unlock];
 }];

 [lock lock];

Do not do this. Not ever.

You shouldn't block. Your asynchronous code's completion handler should trigger an event that causes your code to continue.

[thing doSomethingAsynchronousWithCompletion:^(NSData *readData){
     [dataProcessor processData:readData];
 }];