The ble-nrf51822 implementation of the BLE API generated callbacks for radio
notification events without using the minar scheduler and at very high
priority. This functionality is replaced by posting events through minar
when YOTTA_CFG_MBED_OS is defined. Note that minar could not be used directly
to post callbacks because radio notification events are handled at very high
priority, which caused a hard-fault when minar tries to enter a critical
section. Alternatively, a Timeout was used to post the callback in another
context with lower priority.
S110 compatibility is already present, but this patch adds proper handling
of observer/central related features:
* Gap::startScan will return BLE_ERRROR_NOT_IMPLEMENTED (instead of
PARAM_OUT_OF_RANGE)
* nRF5xGattClient uses the default GattClient implementation when S110 is
in use. All if its methods return NOT_IMPLEMENTED.
Example: for an application that acts as both a central and a peripheral,
using S110 will make the ble.gap().startScan() call return
BLE_ERROR_NOT_IMPLEMENTED, and advertisement features will continue
running normally.
In addition, with GCC, this patch will free 344 bytes of RAM and 2504
bytes of flash.