added getSystemInfo to the rest client

rest-client/src/main/java/org/thingsboard/rest/client/RestClient.java

@@ -58,6 +58,7 @@ import org.thingsboard.server.common.data.OtaPackage;
 import org.thingsboard.server.common.data.OtaPackageInfo;
 import org.thingsboard.server.common.data.SaveDeviceWithCredentialsRequest;
 import org.thingsboard.server.common.data.StringUtils;
+import org.thingsboard.server.common.data.SystemInfo;
 import org.thingsboard.server.common.data.TbResource;
 import org.thingsboard.server.common.data.TbResourceInfo;
 import org.thingsboard.server.common.data.Tenant;
@@ -373,6 +374,10 @@ public class RestClient implements ClientHttpRequestInterceptor, Closeable {
         }
     }
 
+    public SystemInfo getSystemInfo() {
+        return restTemplate.getForEntity(baseURL + "/api/admin/systemInfo", SystemInfo.class).getBody();
+    }
+
     public Optional<Alarm> getAlarmById(AlarmId alarmId) {
         try {
             ResponseEntity<Alarm> alarm = restTemplate.getForEntity(baseURL + "/api/alarm/{alarmId}", Alarm.class, alarmId.getId());