This section clarifies the functionality of the Radio Notification feature when the SoftDevice operates as a Bluetooth® Low Energy Peripheral.
Radio Notification events are as shown in the following figure.
To guarantee that the ACTIVE notification signal is available to the application at the configured time when a single peripheral link is established, the following condition must hold:
tndist
+
tradio
<
tinterval
For exceptions, see Maximum peripheral packet transfer per Bluetooth Low Energy Radio Event.
The SoftDevice will limit the length of a Radio Event (tradio), thereby reducing the maximum number of packets exchanged, to accommodate the selected tndist. Consecutive peripheral Radio Events with Radio Notification signals shows consecutive Radio Events with Radio Notification signal and illustrates the limitation in tradio which may be required to guarantee tndist is preserved.
Maximum peripheral packet transfer per Bluetooth Low Energy Radio Event shows the limitation on the maximum number of 27-byte packets which can be transferred per Radio Event for given combinations of tndist and tinterval.
tndist | tinterval | ||
---|---|---|---|
7.5 ms | 10 ms | ≥ 15 ms | |
800 | 6 | 6 | 6 |
1740 | 5 | 6 | 6 |
2680 | 4 | 6 | 6 |
3620 | 3 | 5 | 6 |
4560 | 2 | 4 | 6 |
5500 | 1 | 4 | 6 |