Which works better:
- a single GATT characteristic using 'write without response' for transmission from the central to the nRF51822/S110 peripheral and 'notifications' on the same characteristic for transmission from the nRF51822/S110 peripheral back to the central? or
- two characteristics, one using 'write without response' for transmission from the central to the peripheral and a second characteristic using 'notifications' for transmission from the peripheral back to the central? (This is what was done in the NORDIC BLE UART service example. Why?)
This is not a 'discussion' question. hopefully the NORDIC monitor will step in and clarify the issue base on knowledge of the S110 soft device internals.