Start advertising aggressively when powered on then
slow down linearly over 75 seconds. This will conserve
battery by not advertising rapidly the whole time we
are seeking a connection. The slowest rate is
approximately once every 4.5 seconds to balance
responsiveness and battery life.
We use a fixed advertising duration of 5 seconds and start
with a 62.5 ms advertising interval. Every 5 seconds
(the advertising duration) we step up to a larger
advertising interval (slower advertising). We continue
to increase the advertising interval linearly for
75 seconds from the start of advertising. At 75 seconds
we have an advertising interval of 4.44 seconds which we
keep until connected. A reboot will restart the sequence.
When we receive a disconnect event we restart the sequence
with fast advertising and then slow down as described above.
Note that we are not using the BLE high duty cycle setting to
change the advertising rate. The rate is managed by repeatedly
setting the minimum and maximum intervals.
The linear rate of decrease and the slowest interval size
were determined experimentally by the author. The 5.3 Core
spec suggests that you not advertise slower than once
every 1.2 seconds to preserve responsiveness but we
ignored that suggestion.
Instead of casting the UUID object to the ble_uuid_t* used throughout
the NimBLE API just pass the address of the ble_uuid_t member that's at
the start of each of the UUID structs.
Fixed mismatch between the service and characteristic IDs in the
navigation service comments and documentation. They had old values not
reflecting the current code and changes in doc/ble.md
* Make firmware updating more foolproof and fix bugs
* No need to manually handle overflow
* Make startTime TickType_t
* Don't process TouchEvents::None
* Fix sleep getting re-enabled issue more directly
* Retrieve and display bootloader version
- Display bootloader version on System Info screen
- Enable SPI flash sleep mode if bootloader version >= 1.0.0
* Wait for SPI flash to wakeup before starting OTA DFU
- Enable LVGL animation (and disable groups, which were not used), and set the speed.
- Fix disc animation and progress display by initializing lastIncrement at 0 (a random value will be used otherwise, in release build)
If the buffer does not contain any \0, the whole buffer is considered to be the message of the notification. A default title will be displayed in the notification app.
