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it looks that your hello client is scanning and see advertisements from the other guys but it does not do advertisements so it cannot be connected from another client/central device.
The application already have some services described in the hello_client_gatt_database, but you can add more. Just follow the rules. Are you trying to connect from another device to the hello_client? Make sure that your device is sending advertisements. This is done using bleprofile_Discoverable passing high or low parameter.