Failed to run example

[HHX94666]

bluez-dbus-cpp/build$ ./bin/example

Found adapter '/org/bluez/hci0'
Name: XXX
Address: C8:E2:65:07:72:8F type: public
Powered: 1
Discoverable: 1
Pairable: 1

LEAdvertisingManager1
ActiveInstances:
SupportedInstances:
SupportedIncludes: "tx-power","appearance","local-name",
Loading complete.
commands:
q quit
$> DirectedValue()
Error registering application org.bluez.Error.Failed with message Failed to create entry in database
Advertisement registered.

[HHX94666]

Why are there only ReadOnlyCharacteristic and no ReadWriteCharacteristic in the library?

[brouhaha]

I'm not expert at this, but...

The example works for me. The "Failed to create entry in database" is a BlueZ error. The only condition I know of that causes that error is if you try to register a UUID for a service that is already in use or reserved. Did you modify the example Did you run more than one instance of it concurrently?

The ReadOnlyCharacteristic is a convenience wrapper to make a read-only characteristic, and is quite useful for e.g. the characteristics in the Device Information Service.

For a read-write characteristic, you have to create a sublass of GenericCharacteristic, and implement WriteValue(). In the example, in SerialCharacteristic.h, a read/write characteristic class is derived from GenericCharacteristic:

class SerialCharacteristic :
    public GattCharacteristicBuilder<GenericCharacteristic>

and then in example.cpp it is instantiated:

SerialCharacteristic::create( srv2, connection, "de0a7b0c-358f-4cef-b778-8fe9abf09d53" )
        .finalize();