Connect the Data Synchronization Channel Through a Relay Server

To enable your client application to connect through a relay server, you must make manual configuration changes in the object API code to provide the relay server properties.

If a Relay Server is used, the ‘companyID’ in the SUPApplication property must correspond to the MBS farm ID that is used for the messaging client connection.

SUPConnectionProperties props = app.connectionProperties;
[props setFarmId:@"relayServer1"];

For data synchronization through a relay server:

Add the certificate file provided by the Relay Server to the Resource folder of your Xcode project.
Add the following code before calling [SUP101SUP101DB subscribe]:
```
SUPConnectionProfile *sp = [SUP101SUP101DB getSynchronizationProfile];
[sp setNetworkProtocol:@"https"]; // or http
[sp setPortNumber:443]; // if http then corresponding port
[sp setNetworkStreamParams:@"trusted_certificates=certificateName;compression=zlib;url_suffix=urlsuffixProvidedByTheRelayServer"];
```
- NetworkProtocol – http or https.
- PortNumber – the correct port number for the selected NetworkProtocol.
- NetworkStreamParams – certificateName: the name of the certificate you added in the Resource folder.
  urlsuffixProvidedByTheRelayServer: the URL suffix provided by the Relay Server

For more information on Relay Server configuration, see System Administration and Sybase Control Center for Sybase Unwired Platform.