modifyPwd method
Implementation
@override
Future<String?> modifyPwd(String devSn, String devMac, String devEkey,
int keyType, String oldPwd, String newPwd) async{
final result = await methodChannel.invokeMethod('modifyPwd', {"devSn": devSn, "devMac":devMac, "devEkey":devEkey, "keyType":keyType, "oldPwd":oldPwd, "newPwd":newPwd});
return result;
}