Cannot get temperature.cc example to work

[NSExceptional]

I modified it to take a hard-coded address and a different characteristic, and ran it against a BLE fitness watch. It connects, and finds the characteristic (which has .notify = true in the debugger) but the notify callback is never executed.

Here is the code, in case it helps, but it's 99% of what is in temperature.cc

int main(int argc, char **argv)
{
    log_level = Error;

    BLEGATTStateMachine gatt;

    std::function<void(const PDUNotificationOrIndication&)> notifyCallback = [&](const PDUNotificationOrIndication& n) {
        auto ms_since_epoch = duration_cast<milliseconds>(system_clock::now().time_since_epoch());
        float temp = bluetooth_float_to_IEEE754(n.value().first+1);

        cout << setprecision(15) << ms_since_epoch.count()/1000. << " " << setprecision(5) << temp << endl;
    };

    std::function<void()> found_services_and_characteristics_cb = [&gatt, &notifyCallback]() {
        for (auto& service: gatt.primary_services) {
            for (auto& characteristic: service.characteristics) {
                // My custom characteristic
                if (characteristic.uuid == UUID("3ea6")) {
                    characteristic.cb_notify_or_indicate = notifyCallback;
                    characteristic.set_notify_and_indicate(true, false);
                }
            }
        }
    };

    gatt.setup_standard_scan(found_services_and_characteristics_cb);

    gatt.cb_disconnected = [](BLEGATTStateMachine::Disconnect d) {
        cerr << "Disconnect for reason " << BLEGATTStateMachine::get_disconnect_string(d) << endl;
        exit(1);
    };

    // My hard-coded address
    gatt.connect_blocking("88:6B:XX:XX:XX:XX");
    for (;;) {
        gatt.read_and_process_next();
    }
}

[edrosten]

On Thu, 21 Nov 2019 at 15:56, Tanner Bennett notifications@github.com wrote:

I modified it to take a hard-coded address and a different characteristic, and ran it against a BLE fitness watch. It connects, and finds the characteristic (which has .notify = true in the debugger) but the notify callback is never executed.

If you do the same thing by hand in a bluetooth explorer (such as nRF's app), do you receive notifications?

-Ed

Here is the code, in case it helps, but it's 99% of what is in

temperature.cc

int main(int argc, char **argv) { log_level = Error;

BLEGATTStateMachine gatt;

std::function<void(const PDUNotificationOrIndication&)> notifyCallback = [&](const PDUNotificationOrIndication& n) { auto ms_since_epoch = duration_cast(system_clock::now().time_since_epoch()); float temp = bluetooth_float_to_IEEE754(n.value().first+1);

  cout << setprecision(15) << ms_since_epoch.count()/1000. << " " << setprecision(5) << temp << endl;

};

std::function<void()> found_services_and_characteristics_cb = [&gatt, &notifyCallback]() { for (auto& service: gatt.primary_services) { for (auto& characteristic: service.characteristics) { if (characteristic.uuid == UUID("3ea6")) { characteristic.cb_notify_or_indicate = notifyCallback; characteristic.set_notify_and_indicate(true, false); } } } };

gatt.setup_standard_scan(found_services_and_characteristics_cb);

gatt.cb_disconnected = [](BLEGATTStateMachine::Disconnect d) { cerr << "Disconnect for reason " << BLEGATTStateMachine::get_disconnect_string(d) << endl; exit(1); };

gatt.connect_blocking("88:6B:0F:64:2E:0D");

for (;;) { gatt.read_and_process_next(); } }

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[NSExceptional]

I do not, it appears to be the watch acting funny. It won't notify me of anything it tells me I can be notified about.

My bad, I'll close this!