Improved rate limits message for MQTT session events

@@ -26,6 +26,7 @@ public class TbRateLimitsException extends RuntimeException {
     private final EntityType entityType;
 
     public TbRateLimitsException(EntityType entityType) {
+        super(entityType.name() + " rate limits reached!");
         this.entityType = entityType;
     }
 }

@@ -951,7 +951,7 @@ public class MqttTransportHandler extends ChannelInboundHandlerAdapter implement
                 @Override
                 public void onError(Throwable e) {
                     if (e instanceof TbRateLimitsException) {
-                        log.trace("[{}] Failed to submit session event", sessionId, e);
+                        log.trace("[{}] Failed to submit session event: {}", sessionId, e.getMessage());
                     } else {
                         log.warn("[{}] Failed to submit session event", sessionId, e);
                     }

@@ -57,7 +57,7 @@ public class DefaultTransportRateLimitService implements TransportRateLimitServi
     @Override
     public EntityType checkLimits(TenantId tenantId, DeviceId deviceId, int dataPoints) {
         if (!tenantAllowed.getOrDefault(tenantId, Boolean.TRUE)) {
-            return EntityType.TENANT;
+            return EntityType.API_USAGE_STATE;
         }
         if (!checkEntityRateLimit(dataPoints, getTenantRateLimits(tenantId))) {
             return EntityType.TENANT;