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// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <QtBluetooth/QBluetoothAddress>
#include <QLowEnergyController>
#include <QCoreApplication>
#include <QElapsedTimer>
#include <QEventLoop>
#include <QThread>
#include <QTimer>
#include <QDebug>
#include <libdivecomputer/version.h>
#include "libdivecomputer.h"
#include "core/qt-ble.h"
#if defined(SSRF_CUSTOM_IO)
#include <libdivecomputer/custom_io.h>
extern "C" {
void waitFor(int ms) {
Q_ASSERT(QCoreApplication::instance());
Q_ASSERT(QThread::currentThread());
QElapsedTimer timer;
timer.start();
do {
QCoreApplication::processEvents(QEventLoop::AllEvents, ms);
QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
QThread::msleep(10);
} while (timer.elapsed() < ms);
}
void BLEObject::serviceStateChanged(QLowEnergyService::ServiceState s)
{
Q_UNUSED(s)
QList<QLowEnergyCharacteristic> list;
auto service = qobject_cast<QLowEnergyService*>(sender());
if (service)
list = service->characteristics();
Q_FOREACH(QLowEnergyCharacteristic c, list) {
qDebug() << " " << c.uuid().toString();
}
}
void BLEObject::characteristcStateChanged(const QLowEnergyCharacteristic &c, const QByteArray &value)
{
Q_UNUSED(c)
receivedPackets.append(value);
waitForPacket.exit();
}
void BLEObject::writeCompleted(const QLowEnergyDescriptor &d, const QByteArray &value)
{
Q_UNUSED(d)
Q_UNUSED(value)
qDebug() << "BLE write completed";
}
void BLEObject::addService(const QBluetoothUuid &newService)
{
qDebug() << "Found service" << newService;
bool isStandardUuid = false;
newService.toUInt16(&isStandardUuid);
if (isStandardUuid) {
qDebug () << " .. ignoring standard service";
return;
}
auto service = controller->createServiceObject(newService, this);
qDebug() << " .. created service object" << service;
if (service) {
services.append(service);
connect(service, &QLowEnergyService::stateChanged, this, &BLEObject::serviceStateChanged);
connect(service, &QLowEnergyService::characteristicChanged, this, &BLEObject::characteristcStateChanged);
connect(service, &QLowEnergyService::descriptorWritten, this, &BLEObject::writeCompleted);
service->discoverDetails();
}
}
BLEObject::BLEObject(QLowEnergyController *c, dc_user_device_t *d)
{
controller = c;
device = d;
}
BLEObject::~BLEObject()
{
qDebug() << "Deleting BLE object";
}
/* Yeah, I could do the C++ inline member thing */
static int device_is_shearwater(dc_user_device_t *device)
{
return !strcmp(device->vendor, "Shearwater");
}
dc_status_t BLEObject::write(const void *data, size_t size, size_t *actual)
{
Q_UNUSED(actual) // that seems like it might cause problems
QList<QLowEnergyCharacteristic> list = preferredService()->characteristics();
QByteArray bytes((const char *)data, (int) size);
if (!list.isEmpty()) {
const QLowEnergyCharacteristic &c = list.constFirst();
QLowEnergyService::WriteMode mode;
mode = (c.properties() & QLowEnergyCharacteristic::WriteNoResponse) ?
QLowEnergyService::WriteWithoutResponse :
QLowEnergyService::WriteWithResponse;
if (device_is_shearwater(device))
bytes.prepend("\1\0", 2);
preferredService()->writeCharacteristic(c, bytes, mode);
return DC_STATUS_SUCCESS;
}
return DC_STATUS_IO;
}
dc_status_t BLEObject::read(void *data, size_t size, size_t *actual)
{
if (receivedPackets.isEmpty()) {
QList<QLowEnergyCharacteristic> list = preferredService()->characteristics();
if (list.isEmpty())
return DC_STATUS_IO;
QTimer timer;
int msec = 5000;
timer.setSingleShot(true);
waitForPacket.connect(&timer, SIGNAL(timeout()), SLOT(quit()));
timer.start(msec);
waitForPacket.exec();
}
// Still no packet?
if (receivedPackets.isEmpty())
return DC_STATUS_IO;
QByteArray packet = receivedPackets.takeFirst();
if (device_is_shearwater(device))
packet.remove(0,2);
if (size > (size_t)packet.size())
size = packet.size();
memcpy(data, packet.data(), size);
*actual = size;
return DC_STATUS_SUCCESS;
}
dc_status_t qt_ble_open(dc_custom_io_t *io, dc_context_t *context, const char *devaddr)
{
Q_UNUSED(context)
/*
* LE-only devices get the "LE:" prepended by the scanning
* code, so that the rfcomm code can see they only do LE.
*
* We just skip that prefix (and it doesn't always exist,
* since the device may support both legacy BT and LE).
*/
if (!strncmp(devaddr, "LE:", 3))
devaddr += 3;
QBluetoothAddress remoteDeviceAddress(devaddr);
// HACK ALERT! Qt 5.9 needs this for proper Bluez operation
qputenv("QT_DEFAULT_CENTRAL_SERVICES", "1");
QLowEnergyController *controller = new QLowEnergyController(remoteDeviceAddress);
qDebug() << "qt_ble_open(" << devaddr << ")";
if (device_is_shearwater(io->user_device))
controller->setRemoteAddressType(QLowEnergyController::RandomAddress);
// Try to connect to the device
controller->connectToDevice();
// Create a timer. If the connection doesn't succeed after five seconds or no error occurs then stop the opening step
int msec = 5000;
while (msec > 0 && controller->state() == QLowEnergyController::ConnectingState) {
waitFor(100);
msec -= 100;
};
switch (controller->state()) {
case QLowEnergyController::ConnectedState:
qDebug() << "connected to the controller for device" << devaddr;
break;
default:
qDebug() << "failed to connect to the controller " << devaddr << "with error" << controller->errorString();
report_error("Failed to connect to %s: '%s'", devaddr, controller->errorString().toUtf8().data());
controller->disconnectFromDevice();
delete controller;
return DC_STATUS_IO;
}
/* We need to discover services etc here! */
BLEObject *ble = new BLEObject(controller, io->user_device);
ble->connect(controller, SIGNAL(serviceDiscovered(QBluetoothUuid)), SLOT(addService(QBluetoothUuid)));
qDebug() << " .. discovering services";
controller->discoverServices();
msec = 5000;
while (msec > 0 && controller->state() == QLowEnergyController::DiscoveringState) {
waitFor(100);
msec -= 100;
};
qDebug() << " .. done discovering services";
if (ble->preferredService() == nullptr) {
qDebug() << "failed to find suitable service on" << devaddr;
report_error("Failed to find suitable service on '%s'", devaddr);
controller->disconnectFromDevice();
delete controller;
return DC_STATUS_IO;
}
qDebug() << " .. discovering details";
msec = 5000;
while (msec > 0 && ble->preferredService()->state() == QLowEnergyService::DiscoveringServices) {
waitFor(100);
msec -= 100;
};
if (ble->preferredService()->state() != QLowEnergyService::ServiceDiscovered) {
qDebug() << "failed to find suitable service on" << devaddr;
report_error("Failed to find suitable service on '%s'", devaddr);
controller->disconnectFromDevice();
delete controller;
return DC_STATUS_IO;
}
qDebug() << " .. enabling notifications";
/* Enable notifications */
QList<QLowEnergyCharacteristic> list = ble->preferredService()->characteristics();
if (!list.isEmpty()) {
const QLowEnergyCharacteristic &c = list.constLast();
QList<QLowEnergyDescriptor> l = c.descriptors();
qDebug() << "Descriptor list with" << l.length() << "elements";
QLowEnergyDescriptor d;
foreach(d, l)
qDebug() << "Descriptor:" << d.name() << "uuid:" << d.uuid().toString();
if (!l.isEmpty()) {
d = l.first();
qDebug() << "now writing \"0x0100\" to the first descriptor";
ble->preferredService()->writeDescriptor(d, QByteArray::fromHex("0100"));
}
}
// Fill in info
io->userdata = (void *)ble;
return DC_STATUS_SUCCESS;
}
dc_status_t qt_ble_close(dc_custom_io_t *io)
{
BLEObject *ble = (BLEObject *) io->userdata;
io->userdata = NULL;
delete ble;
return DC_STATUS_SUCCESS;
}
dc_status_t qt_ble_read(dc_custom_io_t *io, void* data, size_t size, size_t *actual)
{
BLEObject *ble = (BLEObject *) io->userdata;
return ble->read(data, size, actual);
}
dc_status_t qt_ble_write(dc_custom_io_t *io, const void* data, size_t size, size_t *actual)
{
BLEObject *ble = (BLEObject *) io->userdata;
return ble->write(data, size, actual);
}
} /* extern "C" */
#endif
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