Support device special codes
Contributes to #7 (closed).
There're some specific well-known codes, that are handled on the device directly (not via the modem, not as USSD codes) The initial handle is already there from !33 (merged): !33 (ccf65b36) .
Contributes to #7 (closed).
There're some specific well-known codes, that are handled on the device directly (not via the modem, not as USSD codes) The initial handle is already there from !33 (merged): !33 (ccf65b36) .