I am running an ESP32 Direct Connected device with STDK v2.3.2. The device has been working fine with the same code and environment, but since yesterday it has been repeatedly restarting. After analyzing the logs, I found that if a PUBACK for a QoS1 PUBLISH sent immediately after MQTT cloud connec…

Thank you for confirming that the issue has been resolved. I tried again and can now access the Product page without any problems. We are currently preparing for WWST certification, and once certified, we plan to ship a product with the SmartThings SDK built in. For that reason, I’d like to underst…

@nayelyz Our device repeatedly fails to connect to the SmartThings server. The MQTT connection itself succeeds, but the sign-in handshake right after never completes — the device logs GG connection fail after about 5 seconds, disconnects, and retries. I (52207) [IoT]: iot_es_connect(1225) > MQTT c…

@nayelyz This problem has continued for a week now. With the same firmware on the same device, it connects to SmartThings fine on some days and fails on others — sometimes even within the same day (no connection for ~3 hours, then it suddenly works and stays stable for the rest of the day). Nothing…

Also, for context: I’ve been developing this Direct Connected device for 4 months now, and this problem never occurred during that entire time. It only started about two weeks ago. Was there any change on your side around that time that could be related?

Hi @JohnJo Thank you for your patience. We checked with the team regarding the previous 500 error. The issue was isolated to the web side and should not have affected device connectivity. The team also mentioned that there have not been any significant updates since the beginning of May that would…

Device repeatedly restarts due to QoS1 PUBLISH PUBACK not received

Apps & Clients SmartThings (Samsung Connect)

nayelyz June 19, 2026, 8:54pm 2

Hi, @JohnJo
Since you mentioned this started after the 500 issue.
Can you help us confirm this issue remains, please? The other one is solved, as mentioned in this thread:

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Device repeatedly restarts due to QoS1 PUBLISH PUBACK not received

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