Android & iOS dns-sd: how to make opening a service cross-platform?

Question

On Android, I do this to create a broadcast service using a simple linked map as information

HashMap<String, String> record = new HashMap<>(); record.put("info, "my android info"); WifiP2pDnsSdServiceInfo serviceInfo = WifiP2pDnsSdServiceInfo .newInstance("_myservice", "_tcp", record); WifiP2pManager manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE); Channel channel = manager.initialize(this, this.getMainLooper(), null); manager.addLocalService(channel, serviceInfo, null); 

to get another signal

 manager.setDnsSdResponseListeners(channel, this, this); @Override public void onDnsSdTxtRecordAvailable(String fullDomainName, Map<String, String> txtRecordMap, WifiP2pDevice srcDevice) 

On iOS, this is the same service name and information map

 MCPeerID* _myPeerId=[[MCPeerID alloc] initWithDisplayName:@"my ios peer"]; NSDictionary* _serviceInfo=@ {@"info": @"my ios info"}; MCNearbyServiceAdvertiser* _serviceAdvertiser = [[MCNearbyServiceAdvertiser alloc] initWithPeer:_myPeerId discoveryInfo:_serviceInfo serviceType:@"myservice"]; _serviceAdvertiser.delegate=advertiseDelegate; MCNearbyServiceBrowser* _serviceBrowser=[[MCNearbyServiceBrowser alloc] initWithPeer:_myPeerId serviceType:@"myservice"]; _serviceBrowser.delegate=browserDelegate; [_serviceAdvertiser startAdvertisingPeer]; [_serviceBrowser startBrowsingForPeers]; 

and delegates

 -(void)browser:(MCNearbyServiceBrowser *)browser lostPeer:(MCPeerID *)peerID -(void)browser:(MCNearbyServiceBrowser *)browser foundPeer:(MCPeerID *)peerID withDiscoveryInfo:(NSDictionary<NSString *,NSString *> *)info 

An Android device can only see another Android device, as well as iOS devices. However, two families cannot see each other. I would like them to see other devices, regardless of the operating system.