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Gerriko avatar Gerriko commented on July 24, 2024

It looks like my issue is related to an issue that was closed in July 2021: #7

So, in the absence of a response, I decided to try and understand these utility classes better and see if I can come up with a solution that fits within this design structure.

Well I did come up with something that works and this also removes the need to hard code the device name within gatt_server_process.h (get_device_name override function).

So for gatt_server_process.h

/**
 * Simple GattServer wrapper. It will advertise and allow a connection.
 */
class GattServerProcess : public BLEProcess
{
public:
    static const char *DEVICE_NAME;
    static const char *GATTSERVICE_UUID;

    GattServerProcess(events::EventQueue &event_queue, BLE &ble_interface) :
        BLEProcess(event_queue, ble_interface)
    {
    }

    const char* get_device_name() override
    {
        return DEVICE_NAME;
    }

    /** Service list uuid */
    virtual const UUID get_servicelist_uuid() override
    {
        return UUID(GATTSERVICE_UUID);
    }
};

#endif /* GATT_SERVER_PROCESS_H_ */

Then within your main app code you can provide the data - note that here I simply created an example using a 128-bit UUID:

const char *GattServerProcess::DEVICE_NAME =        "GattServer";
const char *GattServerProcess::GATTSERVICE_UUID =   "51311102-030e-485f-b122-f8f381aa84ed";

int main()
{ .... }

And finally within ble_process.h you can add in a new virtual function, similar to get_device_name() to set the UUID service list. I did the following:

    /** Name we advertise as. */
    virtual const char* get_device_name()
    {
        static const char name[] = "";
        return name;
    }

    /** Service list uuid */
    virtual const UUID get_servicelist_uuid()
    {
        static const char serviceuuid[] = "0000";
        return UUID(serviceuuid);
    }

protected:
    /**
     * Start the advertising process; it ends when a device connects.
     */
    void start_advertising()
    {
        ble_error_t error;

        <<<<< ----- etc. ----- >>>>>>>>>>>>>>>

        _adv_data_builder.clear();
        _adv_data_builder.setFlags();
        _adv_data_builder.setName(get_device_name());

        UUID _GATT_uuid = get_servicelist_uuid();
        _adv_data_builder.setLocalServiceList(mbed::make_Span(&_GATT_uuid, 1));

        <<<<< ----- etc. ----- >>>>>>>>>>>>>>>

}

I have only tested once to confirm that I can see the device name and GATT service UUID being advertised and my phone was able to connect and view the added service etc.

If there is a cleaner way of doing this it would be good to know.

Thanks.

from mbed-os-ble-utils.

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