Hi,

I am not able to use the MQTT Publisher for Simatic CPU with security (https://support.industry.siemens.com/cs/ww/en/view/109748872 )

The application example without security works perfectly, but when I try to use it with certificates, TIA Portal says there is a problem with the Certificate Authority (TCON block) and, windows says "Socket error on client <unknown>, disconnecting". I am using a CPU 1512SP F-1 PN with firmware 2.1 as MQTT client, and Mosquitto as MQTT Broker (server). I have tried with Mosquitto in my PG and also with Mosquito Broker in an IOT2040, in both cases the error is the same. 

Any idea about what can be happening?

Attached there is a .zip with the certificates (generated with openssl) I am using, TIA Portal project of the CPU, and mosquitto configuration file.

Thanks in advance

Sorry, has been solved with Yu-wen Tang answer from this post