From 58612a1b7943569ddfb98be6980d7881136d90b4 Mon Sep 17 00:00:00 2001
From: "aofa.liu" <laucenmi@qq.com>
Date: Thu, 9 Jul 2026 19:16:31 +0800
Subject: [PATCH] fix: register MqttClient::subscribe ack callback regardless
 of QoS value

---
 mqtt/mqtt_client.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mqtt/mqtt_client.h b/mqtt/mqtt_client.h
index 4211ddbc8..ec9110f41 100644
--- a/mqtt/mqtt_client.h
+++ b/mqtt/mqtt_client.h
@@ -250,7 +250,7 @@ class MqttClient {
 
     int subscribe(const char* topic, int qos = 0, MqttCallback ack_cb = NULL) {
         int mid = mqtt_client_subscribe(client, topic, qos);
-        if (qos > 0 && mid >= 0 && ack_cb) {
+        if (mid >= 0 && ack_cb) {
             setAckCallback(mid, ack_cb);
         }
         return mid;