Fix MQTT reconnect during proxy attach (#1078)

pubber/src/main/java/udmi/lib/base/MqttPublisher.java

@@ -94,7 +94,7 @@ public class MqttPublisher implements Publisher {
   private static final Map<String, AtomicInteger> EVENT_SERIAL = new HashMap<>();
   private static final String GCP_CLIENT_PREFIX = "projects/";
   private static final Integer DEFAULT_MQTT_PORT = 8883;
-  private static final long ATTACH_DELAY_MS = 1000;
+  private static final long RETRY_DELAY_MS = 1000;
   private static final String LOCAL_MQTT_PREFIX = "/r/";
 
   private final Semaphore connectionLock = new Semaphore(1);
@@ -205,7 +205,7 @@ private void publishCore(String deviceId, String topicSuffix, Object data, Runna
       debug(format("Sending message to %s", sendTopic));
       if (!sendMessage(deviceId, sendTopic, payload.getBytes())) {
         debug(format("Queue message for retry %s %s", topicSuffix, deviceId));
-        safeSleep(ATTACH_DELAY_MS);
+        safeSleep(RETRY_DELAY_MS);
         if (isActive()) {
           publisherExecutor.submit(() -> publishCore(deviceId, topicSuffix, data, callback));
         }
@@ -321,20 +321,16 @@ private MqttClient newProxyClient(String deviceId) {
     String gatewayId = getGatewayId();
     info(format("Connecting device %s through gateway %s", deviceId, gatewayId));
     final MqttClient mqttClient = getConnectedClient(gatewayId);
-    long timeToWait = mqttClient.getTimeToWait();
     try {
       startupLatchWait(connectionLatch, "gateway startup exchange");
       String topic = getMessageTopic(deviceId, MqttDevice.ATTACH_TOPIC);
       info(format("Publishing attach message %s", topic));
       byte[] mqttMessage = EMPTY_STRING.getBytes(StandardCharsets.UTF_8);
-      mqttClient.setTimeToWait(ATTACH_DELAY_MS);
       mqttClientPublish(mqttClient, topic, mqttMessage);
       subscribeToUpdates(mqttClient, deviceId);
       return mqttClient;
     } catch (Exception e) {
       throw new RuntimeException(format("While binding client %s", deviceId), e);
-    } finally {
-      mqttClient.setTimeToWait(timeToWait);
     }
   }