getVideoSources method Null safety
This command lists all available physical video inputs of the device.
Implementation
Future<List<VideoSource>> getVideoSources() async {
loggy.debug('getVideoSources');
final envelope = await Soap.retrieveEnvelope(
uri, onvif.secureRequest(SoapRequest.videoSources()));
if (envelope.body.videoSourcesResponse == null) throw Exception();
return envelope.body.videoSourcesResponse!.videoSources;
}