Is the PSM UUID format is less stringent than the BLE Service and Characteristic UUID? In our BLE cluster we broadcast both for different tasks... is a GATT and L2Cap mixed cluster of Apple devices ok?
Hello. PSM is defined differently than a UUID, it is a 16 byte numeric value that is automatically assigned when you publish on an iOS device, its not a complete UUID which can be either 2 bytes or 16 bytes. Can you elaborate more on the mixed cluster of devices ?
Our Apple device cluster implements a single iPhone central and many iPhone peripherals which share their content to the iPhone central to process.The central sends its results to specific or all Apple peripherals. It’s an initial reimplementation of Multipeer Connectivity... so initial discovery and auth is processed via GATT and then streaming content is processed via L2Cap.
Ok, thanks for the clarification. That should still work - which device is publishing the PSM, which device is connecting to an existing PSM ? Are you publishing a single PSM or multiple ones on a single device?
after authentication, the central publishes to the peripheral so the central can have a 1/2 dozen or so open streams but each peripheral will have 1 stream open to its central... that's the current use case until we implement full MPC with multi-peer streams
Thanks for that info. One central can connect to multiple remote PSM's. Is there anything else I can help with ?
I normally implement Apple-based algorithms for custom encryption in our wifi based MPC clusters and have opted to use the CoreBluetooth standard encryption for both Gatt and L2Cap connections. Any guidance in using public key and/or Apple's post-quantum encryption in the Bluetooth cluster or do you think that is too heavy? Much thanks
Hello. I do not have a definitive answer here, this is something you will need to investigate and research for your specific use case, based on the latency requirements, throughput requirements, and the phones this is used on. You can also join the Security Q&A sessions or use other Apple security resources to help you understand the different recommendations, requirements and impact to your own use case.
