void triggerToggledWrite(const GattReadCallbackParams *response) {
if (response->handle == ledCharacteristic.getValueHandle()) {
printf("triggerToggledWrite: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len);
for (unsigned index = 0; index < response->len; index++) {
printf("%c[%02x]", response->data[index], response->data[index]);
}
printf("\r\n");
uint8_t toggledValue = response->data[0] ^ 0x1;
ledCharacteristic.write(1, &toggledValue);
}
}
/**
* Initate the read of the characteristic in input.
*
* The completion of the operation will happens in when_characteristic_read()
*/
void read_characteristic(const DiscoveredCharacteristic &characteristic)
{
printf("Initiating read at %u.\r\n", characteristic.getValueHandle());
ble_error_t error = characteristic.read(
0, as_cb(&Self::when_characteristic_read)
);
if (error) {
printf(
"Error: cannot initiate read at %u due to %u\r\n",
characteristic.getValueHandle(), error
);
stop();
}
}
/**
* Initiate the discovery of the descriptors of the characteristic in input.
*
* When a descriptor is discovered, the function when_descriptor_discovered
* is invoked.
*/
void discover_descriptors(const DiscoveredCharacteristic &characteristic)
{
printf("Initiating descriptor discovery of %u.\r\n", characteristic.getValueHandle());
_descriptor_handle = 0;
ble_error_t error = characteristic.discoverDescriptors(
as_cb(&Self::when_descriptor_discovered),
as_cb(&Self::when_descriptor_discovery_ends)
);
if (error) {
printf(
"Error: cannot initiate discovery of %04X due to %u.\r\n",
characteristic.getValueHandle(), error
);
stop();
}
}
ble_error_t nRF5xCharacteristicDescriptorDiscoverer::launch(
const DiscoveredCharacteristic& characteristic,
const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& discoveryCallback,
const CharacteristicDescriptorDiscovery::TerminationCallback_t& terminationCallback
) {
Gap::Handle_t connHandle = characteristic.getConnectionHandle();
// it is ok to deduce that the start handle for descriptors is after
// the characteristic declaration and the characteristic value declaration
// see BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part G] (3.3)
Gap::Handle_t descriptorStartHandle = characteristic.getDeclHandle() + 2;
Gap::Handle_t descriptorEndHandle = characteristic.getLastHandle();
// check if there is any descriptor to discover
if (descriptorEndHandle < descriptorStartHandle) {
CharacteristicDescriptorDiscovery::TerminationCallbackParams_t termParams = {
characteristic,
BLE_ERROR_NONE
};
terminationCallback.call(&termParams);
return BLE_ERROR_NONE;
}
// check if we can run this discovery
if (isConnectionInUse(connHandle)) {
return BLE_STACK_BUSY;
}
// get a new discovery slot, if none are available, just return
Discovery* discovery = getAvailableDiscoverySlot();
if(discovery == NULL) {
return BLE_STACK_BUSY;
}
// try to launch the discovery
ble_error_t err = gattc_descriptors_discover(connHandle, descriptorStartHandle, descriptorEndHandle);
if(!err) {
// commit the new discovery to its slot
*discovery = Discovery(characteristic, discoveryCallback, terminationCallback);
}
return err;
}
void updateLedCharacteristic(void) {
if (!BLE::Instance().gattClient().isServiceDiscoveryActive()) {
ledCharacteristic.read();
}
}
void triggerRead(const GattWriteCallbackParams *response) {
if (response->handle == ledCharacteristic.getValueHandle()) {
ledCharacteristic.read();
}
}