Revert LinkedHashMap

application/src/main/java/org/thingsboard/server/service/edge/rpc/EdgeSessionState.java

@@ -19,14 +19,15 @@ import com.google.common.util.concurrent.SettableFuture;
 import lombok.Data;
 import org.thingsboard.server.gen.edge.v1.DownlinkMsg;
 
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
 import java.util.concurrent.ScheduledFuture;
 
 @Data
 public class EdgeSessionState {
 
-    private final ConcurrentMap<Integer, DownlinkMsg> pendingMsgsMap = new ConcurrentHashMap<>();
+    private final Map<Integer, DownlinkMsg> pendingMsgsMap = Collections.synchronizedMap(new LinkedHashMap<>());
     private SettableFuture<Void> sendDownlinkMsgsFuture;
     private ScheduledFuture<?> scheduledSendDownlinkTask;
 }