I am learning Core Bluetooth to improve my general skills and marketability for new jobs. I have written a MacOS app that acts as a CBPeripheralManager and an iOS app that acts as a CBCentralManager. I have gotten the Peripheral to stream small data chunks to the Central just fine.
Now I am looking to learn how to send larger data amounts. I have seen the sample code for sending data to subscribers in chunks and am in the process of porting that to Swift. But the CoreBluetooth docs also say: "Note: Use notifications to send a single packet of data to subscribed centrals. That is, when you update a subscribed central, you should send the entire updated value in a single notification, by calling the
updateValue:forCharacteristic:onSubscribedCentrals:readValueForCharacteristic:CBPeripheralWhat I can't figure out is how to use `readValueForCharacteristic:` properly for a peridoically-updating characteristic. Is that possible, actually? I can't seem to subscribe to it to know when ot updates and then call `readValueForCharacteristic` as that endlessly tries to read the data but only gets the partial data. I tried sending an update notification from the Peripheral on one characteristic at the same time as I updated the data on a second characteristic. Then when the central gets the first characteristic update, it tries reading the second charcteristic but it gets `nil` for the value. But if I implement peripheralManager:didReceive readRequest:, and print the value of the characteristic, the Peripheral thinks it has data.
I have also noticed that `readValueForCharacteristic:` also causes subscritptions to time out after 30 seconds or so, if I get this working do I need to resubscribe to services after doing it?
Peripheral code is at https://github.com/natebirkholz/BluetoothTransmitter/tree/MultipleCharacteristics
Central code is at https://github.com/natebirkholz/BluetoothTest/tree/MultipleCharacteristics