init method
Implementation
Future<(List<Licence>, String)> init() async {
final deviceid = await ManagerSDKF().deviceID();
final devicename = await ManagerSDKF().deviceName();
final licences = await ManagerSDKF().readLicences();
_deviceID = deviceid;
_licencias = licences;
_deviceName = devicename;
return (licences, deviceid);
}