Hi,

The client cannot connect because you are using a Java SE client. You should instead use a version specific to Android.
According to the server version, you have two possibilities:

1) If your server version is 6.0.0 or lower you must use the client library included in the server distribution in the folder DOCS-SDKs/sdk_client_android or download it from this link.

2) If your server is 6.0.1 or above, you can get the library from our public Maven repository. For example to download the last version, your pom.xml should specify the following dependency:
<dependency>
<groupId>com.lightstreamer</groupId>
<artifactId>ls-android-client</artifactId>
<version>4.0.9</version>
</dependency>
Further always check you are using the last client version compatible with your server looking at the changelog.