From b91368594db34932dc3d54f74f9fde1e2d6096c1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johan=20Str=C3=B6m?= <johan@stromnet.se>
Date: Mon, 6 Dec 2021 13:38:48 +0100
Subject: [PATCH] MQTT: trigger conn failure callback if DNS success but
 connection failed (#3477)

---
 app/modules/mqtt.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/app/modules/mqtt.c b/app/modules/mqtt.c
index 32119573..5519908e 100644
--- a/app/modules/mqtt.c
+++ b/app/modules/mqtt.c
@@ -1021,7 +1021,12 @@ static void socket_dns_found(const char *name, ip_addr_t *ipaddr, void *arg)
   NODE_DBG(IPSTR, IP2STR(&(ipaddr->addr)));
   NODE_DBG("\n");
 
-  mqtt_socket_do_connect(mud);
+  if(mqtt_socket_do_connect(mud) != ESPCONN_OK) {
+      NODE_DBG("socket_dns_found, got DNS but connect failed\n");
+      mqtt_connack_fail(mud, MQTT_CONN_FAIL_DNS);
+      mqtt_socket_disconnected(arg);
+      return;
+  }
 }
 
 #include "pm/swtimer.h"