The Debug interface is used to debug (sic!). You can execute commands or inject unsolicited responses.
org.freesmartphone.GSM.Debug
Description: Sends an At command.
The command to send.
s: channelThe channel to send this command on. Set to "" to use the default one.
The result of the command
Description: Injects an unsolicited response into the command queue.
The response to inject.
s: channelThe channel to inject this command on. Set to "" to use the default one.