Improved disconnect process - try 5 times before force close session

common/edge-api/src/main/java/org/thingsboard/edge/rpc/EdgeGrpcClient.java

@@ -154,10 +154,30 @@ public class EdgeGrpcClient implements EdgeRpcClient {
         if (!onError) {
             try {
                 inputStream.onCompleted();
-            } catch (Exception ignored) {}
+            } catch (Exception e) {
+                log.error("Exception during onCompleted", e);
+            }
         }
         if (channel != null) {
-            channel.shutdown().awaitTermination(timeoutSecs, TimeUnit.SECONDS);
+            channel.shutdown();
+            int attempt = 0;
+            do {
+                try {
+                    channel.awaitTermination(timeoutSecs, TimeUnit.SECONDS);
+                } catch (Exception e) {
+                    log.error("Channel await termination was interrupted", e);
+                }
+                if (attempt > 5) {
+                    log.warn("We had reached maximum of termination attempts. Force closing channel");
+                    try {
+                        channel.shutdownNow();
+                    } catch (Exception e) {
+                        log.error("Exception during shutdownNow", e);
+                    }
+                    break;
+                }
+                attempt++;
+            } while (!channel.isTerminated());
         }
     }