Always returning 0 (when `MYNEWT_VAL_BLE_LL_RFMGMT_ENABLE_TIME` is not defined), rather than a time near to the current tick, causes an issue in at least one place: `ble_ll_adv_sm_start()`, where the calculation of `delta` overflows when the system timer is at 0x80000000 or above -- causing an incorrect, huge adjustment to be made to the scheduled time, ultimately stopping adverts from being sent.
This issue was caused by DateTime::SetCurrentTime() that would not update the internal state of the class : dayOfWeek, Month, Year were not properly updated according to the current time.
`xTaskGetTickCount()` returns a `TickType_t`, which is defined as an
`uint32_t`. This is compared to the `bpm` variable, which is a `int16_t`
in the range of 40 to 220 as defined in the constructor.
```cpp
lv_arc_set_range(bpmArc, 40, 220);
```
Just assume that `bpm` is greater than 0, as this
would result in a divison by zero or negative values, which would
unintentionally underflow to a very large number.
* docs: Fix a few typos
There are small typos in:
- doc/versioning.md
- src/components/ble/NimbleController.cpp
- src/libs/mynewt-nimble/CODING_STANDARDS.md
- src/libs/mynewt-nimble/docs/btshell/btshell_GAP.rst
- src/systemtask/SystemTask.cpp
Fixes:
- Should read `milliseconds` rather than `miliseconds`.
- Should read `unnecessary` rather than `uncesseray`.
- Should read `target` rather than `tharget`.
- Should read `project` rather than `projct`.
- Should read `preferred` rather than `prefered`.
- Should read `functioning` rather than `functionning`.
- Should read `forever` rather than `forver`.
- Should read `existing` rather than `exisiting`.
On power up, advertise aggressively for at least 30 seconds then switch
to a longer interval to conserve battery life. This fast/slow pattern
is designed to balance connection response time and battery life.
When a disconnect event is received restart the fast/slow pattern.
When a failed connect event is received, restart the fast/slow pattern.
When the screen is activated and ble is not connected, restart the fast/slow pattern.
This pattern is consistent with Apple's BLE developer standards (QA 1931).
