Configuring the ESP SDK to Communicate with a Specific Network Card

Specify the destination network card for communication requests between the ESP SDK and an ESP cluster.

If you have configured Event Stream Processor to use a specific, non-default network card when connecting with other machines, you also need to configure the ESP SDKs to communicate with this specific card. Otherwise, communication requests between the SDK and the cluster will fail. The SDK must have at least one card configured on the same network as the card the ESP cluster is using.

The SDKs establish connections with Event Stream Processor using a uniform resource indicator (URI) in the form esp://localhost:<port>/default/RAP. To configure the SDKs to communicate with a specific network card, replace localhost in the URI with the IP address of the card the ESP cluster is using.

In the C SDK, use the esp_uri_create_string() API to set the URI.
For example, if the ESP cluster you want to communicate with is using a network card with the IP address 192.168.0.1 on port 1911, set the URI as follows:
```
esp_uri_create_string(esp://192.168.0.1:19011/default/RAP)
```
In the Java SDK, use the new Uri.Builder(REAL_CLUSTER_URI).create() API to set the URI.
For example, if the ESP cluster you want to communicate with is using a network card with the IP address 192.168.0.1 on port 1911, set the URI as follows:
```
new Uri.Builder(esp://192.168.0.1:19011/default/RAP).create()
```
In the .NET SDK, use the uri.set_uri("<my_uri>", error); API to set the URI.
For example, if the ESP cluster you want to communicate with is using a network card with the IP address 192.168.0.1 on port 1911, set the URI as follows:
```
uri.set_uri("esp://192.168.0.1:19011/default/RAP", error);
```