Sending updates to characteristic values

- [Instructor] So we've looked at how to handle…read requests in our peripheral…and even subscriptions to notifications of updates.…Now let's look at how to handle…write requests to our peripheral.…In order to write to a characteristic,…we need to update the read/write properties and permissions.…We've seen it already with read and notify,…now we just have to add write.…There's a callback on the CBPeripheralManagerDelegate,…for did receive write requests that we can handle,…access the data that's been cast to our peripheral…and stored in our characteristic.…

Then we can respond to that request…similarly to how we did with the read request.…So let's look back at our IOS peripheral app…and update our characteristic to be able to be writable.…From line 20, we already have the…properties of read and notify.…We can just add write here but the…permissions need to be updated, too.…Currently for our characteristic, it's only readable.…So on line 21, we'll add a permissions set, as well.…

We'll type let permissions and that's…