Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. App for bluetooth scanning
Forum Updated to NodeBB v4.3 + New Features

App for bluetooth scanning

Scheduled Pinned Locked Moved Unsolved General and Desktop
22 Posts 6 Posters 1.8k Views 3 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • SGaistS SGaist

    Thanks for the clear picture.

    Can you explain what you were thinking to do with regards to the use of signals ?

    It seems that you have a pretty well defined API so I think you'll have a controller that will be responsible for the communication with the "hub" device. Is it so ?

    A Offline
    A Offline
    AndreaFurlani
    wrote on last edited by
    #7

    @SGaist Since I'm quite new in Qt and specially in bluetooth, I have no idea on how my app can ask to the box for the list of devices, so my idea was like:

    1- the app send a request signal to the box
    2- the box answer back by sending a list containing all the devices connected
    3- once the user has selected what to do with a device, the app send back a variable containing the device and the action to perform

    A 1 Reply Last reply
    0
    • A AndreaFurlani

      @SGaist Since I'm quite new in Qt and specially in bluetooth, I have no idea on how my app can ask to the box for the list of devices, so my idea was like:

      1- the app send a request signal to the box
      2- the box answer back by sending a list containing all the devices connected
      3- once the user has selected what to do with a device, the app send back a variable containing the device and the action to perform

      A Offline
      A Offline
      Anonymous_Banned275
      wrote on last edited by Anonymous_Banned275
      #8

      @AndreaFurlani said in App for bluetooth scanning:

      @SGaist Since I'm quite new in Qt and specially in bluetooth, I have no idea on how my app can ask to the box for the list of devices, so my idea was like:

      1- the app send a request signal to the box
      2- the box answer back by sending a list containing all the devices connected
      3- once the user has selected what to do with a device, the app send back a variable containing the device and the action to perform

      OK, I am still missing something here .
      Again , from my background :
      in general - "communication" has three basic parts and for simplicity it is defined as communication in one direction only.

      sender -> communication media ->receiver
      or
      source communication media sink / load

      Where is your "box" in this scheme ? Does look like this ?

      sender communication media (bluetooth) "receiver BOX sender " communication media ( actual media ?) receiver

      where "BOX sender" is actually multiple senders ?

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #9

        Your box needs to have a protocol established.

        See the exchanging data between devices part of the Bluetooth chapter in Qt's documentation.

        You'll then have to establish a clear protocol for your "service".

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        A A 2 Replies Last reply
        0
        • SGaistS SGaist

          Your box needs to have a protocol established.

          See the exchanging data between devices part of the Bluetooth chapter in Qt's documentation.

          You'll then have to establish a clear protocol for your "service".

          A Offline
          A Offline
          Anonymous_Banned275
          wrote on last edited by
          #10

          @SGaist said in App for bluetooth scanning:

          Your box needs to have a protocol established.

          See the exchanging data between devices part of the Bluetooth chapter in Qt's documentation.

          You'll then have to establish a clear protocol for your "service".

          Very helpful post .
          Since I started by using btscanner example I was wondering why my "remote bluetooth device " is "identified as "SPP" . Now I have an answer.
          After I get this "inquiry" mess cleaned - up my next step is indeed using "chat "...

          1 Reply Last reply
          0
          • SGaistS SGaist

            Your box needs to have a protocol established.

            See the exchanging data between devices part of the Bluetooth chapter in Qt's documentation.

            You'll then have to establish a clear protocol for your "service".

            A Offline
            A Offline
            AndreaFurlani
            wrote on last edited by
            #11

            @SGaist Thank you very much. I'll try to read it and make some tries.

            1 Reply Last reply
            0
            • A Offline
              A Offline
              AndreaFurlani
              wrote on last edited by
              #12

              Hello again, I returned Here since I'm still stuck. In this moment I'm trying to create a new bluetooth service (in the box code), where I'll ask for creating an retrieve a list of all connected devices (and I still have not idea on how to do it, I saw this in the documentation, maybe could be useful).
              So in this way I can create another service (on the app code) where once retrieved the list will associate to a device a command (and again I still have not idea on how to do it) and send it back to the box to execute it.
              Any idea on how I can do it?
              Thank you again for all the help.

              A 1 Reply Last reply
              0
              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #13

                Something is not clear, what will run on that box ?

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                A 1 Reply Last reply
                0
                • A AndreaFurlani

                  Hello again, I returned Here since I'm still stuck. In this moment I'm trying to create a new bluetooth service (in the box code), where I'll ask for creating an retrieve a list of all connected devices (and I still have not idea on how to do it, I saw this in the documentation, maybe could be useful).
                  So in this way I can create another service (on the app code) where once retrieved the list will associate to a device a command (and again I still have not idea on how to do it) and send it back to the box to execute it.
                  Any idea on how I can do it?
                  Thank you again for all the help.

                  A Offline
                  A Offline
                  Anonymous_Banned275
                  wrote on last edited by Anonymous_Banned275
                  #14

                  @AndreaFurlani I would suggest to take a look at examples. Start with "qtconnectivity" - btscanner.
                  It does the basics - scans for nearby bluetooth devices etc.
                  However it is scarcely documented - in code - and assumes some knowledge about bluetooth.
                  From my experience - do not assume that your "local bluetooth device " is enabled to be used to scan for "remote bluetooth devices".
                  I have two with different dongles with different "class of service" and the scan results are NOT the same.

                  Same for "remote bluetooth device" - my powered "remote device " with serial USB to bluetooth adapter" can be "found" , my powered remote "boom box" has to be activated to be found.
                  Beware of running active operating system "bluetooth manager" software - it actually over-rides , takes precedence, of SOME of your code.

                  A 1 Reply Last reply
                  0
                  • SGaistS SGaist

                    Something is not clear, what will run on that box ?

                    A Offline
                    A Offline
                    AndreaFurlani
                    wrote on last edited by
                    #15

                    @SGaist The box is connected to some lights and sensors via zigbee or bluetooth. I need a list of all the connected devices to the box

                    SGaistS 1 Reply Last reply
                    0
                    • A Anonymous_Banned275

                      @AndreaFurlani I would suggest to take a look at examples. Start with "qtconnectivity" - btscanner.
                      It does the basics - scans for nearby bluetooth devices etc.
                      However it is scarcely documented - in code - and assumes some knowledge about bluetooth.
                      From my experience - do not assume that your "local bluetooth device " is enabled to be used to scan for "remote bluetooth devices".
                      I have two with different dongles with different "class of service" and the scan results are NOT the same.

                      Same for "remote bluetooth device" - my powered "remote device " with serial USB to bluetooth adapter" can be "found" , my powered remote "boom box" has to be activated to be found.
                      Beware of running active operating system "bluetooth manager" software - it actually over-rides , takes precedence, of SOME of your code.

                      A Offline
                      A Offline
                      AndreaFurlani
                      wrote on last edited by
                      #16

                      @AnneRanch thank you for the answer. I already watched all the bluetooth examples in Qt creator but no one of them is useful to understand how to create a new service and in particular how to do the things I need.

                      A 1 Reply Last reply
                      0
                      • A AndreaFurlani

                        @AnneRanch thank you for the answer. I already watched all the bluetooth examples in Qt creator but no one of them is useful to understand how to create a new service and in particular how to do the things I need.

                        A Offline
                        A Offline
                        Anonymous_Banned275
                        wrote on last edited by
                        #17

                        @AndreaFurlani said in App for bluetooth scanning:

                        how to create a new service

                        Since bluetooth devices have "class of service" be careful using the term.
                        I am still unclear about your overall task . I think I asked for simple hardware picture before .
                        Let me make analogy with my project
                        local bt device (PC) -> bluetooth media communication path -> remote bt device (radio )

                        one on my "services" would be - set the radio frequency

                        so "my box - radio " would turn on correct frequency and display it on build-in LCD

                        Are you attempting to do similar tasks via your box ?

                        1 Reply Last reply
                        0
                        • A AndreaFurlani

                          @SGaist The box is connected to some lights and sensors via zigbee or bluetooth. I need a list of all the connected devices to the box

                          SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #18

                          @AndreaFurlani said in App for bluetooth scanning:

                          @SGaist The box is connected to some lights and sensors via zigbee or bluetooth. I need a list of all the connected devices to the box

                          Hence my question what software runs on that box ?

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                          1 Reply Last reply
                          0
                          • A Offline
                            A Offline
                            AndreaFurlani
                            wrote on last edited by
                            #19

                            Hello I'm back again. I made some progress in writing my code. Now the box starts the advertising without problem.
                            Here's the code:

                            void bluetoothDevice::start(bool debugMode, bool protocolDebug)
                            {
                                //Personalized Service for connected bluetooth devices list
                            
                                static const QLatin1String serviceUuid("11223344-5566-7788-99aa-bbccddeeff00");
                                //static const QLatin1String writeListUuid("11223344-5566-7788-99aa-bbccddeeff11");
                                static const QLatin1String readListUuid("11223344-5566-7788-99aa-bbccddeeff11");
                            
                                // [Advertising Data]
                                    QLowEnergyAdvertisingData advertisingData;
                                    advertisingData.setDiscoverability(QLowEnergyAdvertisingData::DiscoverabilityGeneral);
                                    advertisingData.setIncludePowerLevel(true);
                                    advertisingData.setLocalName("BOX");
                                    advertisingData.setServices(QList<QBluetoothUuid>() << QBluetoothUuid(serviceUuid));
                            
                                // [Service Data]
                                    QLowEnergyCharacteristicData readList;
                            
                                    readList.setUuid(QBluetoothUuid(readListUuid));
                                    readList.setProperties(QLowEnergyCharacteristic::Read);
                                    const QLowEnergyDescriptorData clientConfig(QBluetoothUuid::CharacteristicUserDescription,QByteArray(2, 0));
                                    readList.addDescriptor(clientConfig);
                            
                            
                                    //writeList.setUuid(QBluetoothUuid(writeListUuid));
                                    //writeList.setProperties(QLowEnergyCharacteristic::Write);
                            
                            
                                    QLowEnergyServiceData serviceData;
                                    serviceData.setType(QLowEnergyServiceData::ServiceTypePrimary);
                                    serviceData.setUuid(QBluetoothUuid(serviceUuid));
                                    serviceData.addCharacteristic(readList);
                                    //serviceData.addCharacteristic(writeList);
                            
                            
                                // [Start Advertising]
                            
                                    leController.reset(QLowEnergyController::createPeripheral());
                                    service_list.reset(leController->addService(serviceData));
                                    leController->startAdvertising(QLowEnergyAdvertisingParameters(), advertisingData,advertisingData);
                            
                            
                                qCDebug(BLELog) << " Start BLE backend [...] ";
                            
                                ConnectionHandler connectionHandler;
                                DeviceHandler m_deviceHandler;
                            
                            
                                // TODO! Restore debug options.
                                GenericDeviceIf::start(debugMode, protocolDebug);
                            
                                // Initialize reachable state to unreachable.
                                DataModel::getInstance()->setDeviceCategoryReachable(_category, false);
                            
                                _endpoints = DataModel::getInstance() ->getEndpointsListByCategory(dataBaseClasses::ENDPOINT_CATEGORY_BLE);
                            
                                m_deviceHandler.setDevice(nullptr);
                                qDeleteAll(devices);
                                devices.clear();
                            
                                emit devicesChanged();
                            
                                qCDebug(BLELog) << "Scanning for devices...";
                            
                                discoveryAgent->start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod);
                            
                                emit scanningChanged();
                            
                                // [Retrieving the list of devices]
                            
                                    characteristic = service_list->characteristic(QBluetoothUuid(readListUuid));
                            
                                    for (const auto &e: _endpoints){
                                        L.append(QString(e->getMapping()).toUtf8());
                                    }
                            
                                    if (L.empty())
                                        qCDebug(BLELog) << "No endpoints loaded in the list";
                            
                                    for (const auto &list: L) {
                                        service_list -> writeCharacteristic(characteristic, list) ;
                                    }
                            
                            
                            }
                            

                            In this way I am able to connect to the BOX using an external BLE scanner app on my phone and once connected I would like to see the content of "list".
                            With this code the problem is that I can see only the last MAC address in the list, how can I see the complete content?

                            1 Reply Last reply
                            0
                            • H Offline
                              H Offline
                              Habanvee
                              wrote on last edited by Habanvee
                              #20

                              I have been using Bluetooth LE Explorer.
                              But my Bluetooth is not turning on on windows 10 for 2 days any help.

                              Updated: Glad found the solution here for Bluetooth turning on issue.

                              jsulmJ 1 Reply Last reply
                              0
                              • H Habanvee

                                I have been using Bluetooth LE Explorer.
                                But my Bluetooth is not turning on on windows 10 for 2 days any help.

                                Updated: Glad found the solution here for Bluetooth turning on issue.

                                jsulmJ Online
                                jsulmJ Online
                                jsulm
                                Lifetime Qt Champion
                                wrote on last edited by
                                #21

                                @Habanvee In what way is your question related to Qt?
                                You should rather ask in a Windows forum.

                                https://forum.qt.io/topic/113070/qt-code-of-conduct

                                1 Reply Last reply
                                0
                                • M Offline
                                  M Offline
                                  melissa321
                                  wrote on last edited by
                                  #22

                                  I have been using BLE suite this app has a primary scanner view option that detects all the available devices using the Android operating system.

                                  1 Reply Last reply
                                  0

                                  • Login

                                  • Login or register to search.
                                  • First post
                                    Last post
                                  0
                                  • Categories
                                  • Recent
                                  • Tags
                                  • Popular
                                  • Users
                                  • Groups
                                  • Search
                                  • Get Qt Extensions
                                  • Unsolved