Peripheral.observe: How do I wait for the CCCD step to complete before communicating with my peripheral?

[curioustechizen]

I have a fairly straightforward setup:

1. peripheral.connect()
2. Followed by a peripheral.observe(myNotifyCharacteristic)
3. Followed by peripheral.write(myWriteCharacteristic)

On Android, sometimes I see that my step 3 occurs before the CCCD for step 2 is completed and this leads to communication failures with my peripheral. Right now I'm fixing this by adding a few 100ms delay between steps 2 and 3; but this seems brittle.

So, is there a way for observe() to return only after the CCCD has been completed? Or is there another pattern to achieve my original goal?

Edit:

By "CCCD step has been completed", I mean the onDescriptorWrite callback has been received. I tried using the onSubscription lambda of observe method but that seems to be invoked as soon as setCharacteristicNotification is called, not after the onDescriptorWrite is successful.

[twyatt]

I believe the onSubscription lambda should've been able to handle what you're describing.
Can you provide a code snippet of how you were using it?

[curioustechizen]

On deeper inspection it turns out this is a bug in my implementation, not the library. For reasons, I want my connect() API to be a suspending call that returns before I can start communicating with my peripheral.

It looks like I messed up my attempt to convert the observe(characteristic, onSubscription) into a suspending call. I don't think I'll have time to return to this immediately. I'll close this question for now and report back here when I find a way to implement this.