BluetoohLE - Best way to manually read Characteristic value on a given interval?

[wagenheimer]

I need to read some Characteristic values each given interval.

I do use Device.StartTimer but I am having problems writing in a Characteristic of this device, which takes too long.

I wanted to disable the readouts while I'm trying to write, but this way doesn't seem to be threadsafe and I can't set a variable to prevent readouts while writing.

What would be the correct way to do this?

[aritchie]

Android prevents a read/write at the same time (it has to). iOS does not, but does its own internal synchronization.

Observable
    .Interval(TimeSpan.FromSeconds(30))
    .Where(_ => !this.IsWriting)
    .Select(_ => yourChar.Read())
    .Switch()
    .Subscribe(
        x => {}, // do whatever with the read value
        ex => {} // deal with error
   );

I'm not sure why you can't set a var when writing, but you need to for your requirement

[wagenheimer]

Hi! Thanks for the help!

But I'm facing the same problem with Observable.Interval that I was when using Timers.

IsWriting=true;
await ManagedPeripheral.Write(serviceUuid, characteristicUuid, valueToSend);
IsWriting=false;

For some reason, it still keeps reading the values even with IsBusy=true, and to Write a single bit takes several seconds (And I can see the UI still updating with new values while still awaiting for the writing.

I'm thinking it's a ThreadSafe problem. Do you have any idea why this is occurring and the correct way to resolve this?

[aritchie]

No idea. I gave the solution I use in a project. You can always interlock the boolean if you have that big of a race condition.