How do I force CDRouter to use an empty string for the PPPoE Service Name field?

The testvar pppoeServiceName controls the value of the PPPoE Service Name field that CDRouter’s PPPoE server will include in all PPPoE PADO packets. CDRouter will automatically populate the Service Name with a value of qacafe if the testvar pppoeServiceName is set to the empty string:

testvar pppoeServiceName ""

Using the keyword any instead will force CDRouter to use an empty string for the Service Name field:

testvar pppoeServiceName any