Fix flaky testReadSingleResource_sendFromClient_CollectedValue: reset static timestamps before each run

Static fields RESOURCE_ID_3303_12_5700_TS_0/TS_1 in Lwm2mTestHelper are never
reset between test runs. On CI retries the await() at the start of the test
passes immediately (both timestamps are still > 0 from the previous run), so
the telemetry query uses stale timestamps and the second await() times out.

Fix: add @Before that resets both timestamps to 0 before each test method,
which was already correctly implied by the unused @Before import.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

application/src/test/java/org/thingsboard/server/transport/lwm2m/rpc/sql/RpcLwm2mIntegrationReadCollectedValueTest.java

@@ -21,6 +21,7 @@ import com.fasterxml.jackson.databind.node.ObjectNode;
 import lombok.extern.slf4j.Slf4j;
 import org.junit.Before;
 import org.junit.Test;
+import org.thingsboard.server.transport.lwm2m.Lwm2mTestHelper;
 import org.thingsboard.server.transport.lwm2m.rpc.AbstractRpcLwM2MIntegrationTest;
 import java.util.concurrent.atomic.AtomicReference;
 import static java.util.concurrent.TimeUnit.SECONDS;
@@ -37,6 +38,12 @@ import static org.thingsboard.server.transport.lwm2m.Lwm2mTestHelper.RESOURCE_ID
 @Slf4j
 public class RpcLwm2mIntegrationReadCollectedValueTest extends AbstractRpcLwM2MIntegrationTest {
 
+    @Before
+    public void resetCollectedValueTimestamps() {
+        Lwm2mTestHelper.RESOURCE_ID_3303_12_5700_TS_0 = 0;
+        Lwm2mTestHelper.RESOURCE_ID_3303_12_5700_TS_1 = 0;
+    }
+
     /**
      * Read {"id":"/3303/12/5700"}
      * Trigger a Send operation from the client with multiple values for the same resource as a payload