Bluetooth Diagnostic Tool
Volker from Germany pointed me at this very useful tool which allows you to scan for BT Services from your device.
In short btCrawler is a simple bluetooth scanner. It scans for visible devices in range and can perform a service query. You can also query for services of your own device. In the device list: COD means "Class of Device" (see bluetooth specification for more info). In the output window, when the sdp services are listed, "ChId" means Channel ID, which is the RFCOMM Channel the service is listening on. It supports both, landscape and portrait screens.