Publishing MQTT messages with EXS62-W module | Telit Cinterion IoT Developer Community

Hello,

I am trying to publish a MQTT message with AT commands for EXS62-W module. I managed to publish a message with the configuration of AT ^SISS commands. But I want to send some encrypted data and I can do it only with the command that sends bytes. So I try to send my message with AT ^SISU and AT ^SISW commands. But when I send the command AT ^SISU ( AT ^SISU=1, "publish", "2;test;1;;14" ), I get an error
( ^ SIS: 1,0,57, "Topic parameter is missing" ). I do not understand what I am doing wrong, because I have a topic set to "test" in the command.
Maybe someone can help me what is wrong. The whole list of commands I use can be found here:

AT^SISS=1,"srvType","Mqtt"
OK

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AT^SISS=1,"conId","1"
OK

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AT^SISS=1,"address","mqtt://0.tcp.eu.ngrok.io:15522"
OK

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AT^SISS=1,"clientid","uniqueID1234"
OK

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AT^SISS=1,cleanSession,"1"
OK

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AT^SISS=1,"cmd","publish"
OK

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AT^SISS=1,"Topic","test"
OK

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AT^SISS=1,"hcContent","Test Message"
OK

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AT^SISS=1,"hcContLen",0
OK

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AT^SICA=1,1
OK

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AT^SISO=1,2
OK

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^SIS: 1,0,8800,"Mqtt connect 3.125.209.94:15522"

^SIS: 1,0,2500,"Connection accepted on clean session."

^SISW: 1,2
AT^SISD=1,"cleanParam"
OK

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AT^SISU=1,"subscribe","MQTTDemoListener;2"
OK

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^SIS: 1,0,2520,"MQTTDemoListener"

^SIS: 1,0,2520,"2"

-----------------------------------

AT^SISU=1,"publish","2;test;1;0;14"
+CME ERROR: operation failed

^SIS: 1,0,57,"topic parameter missing"

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AT^SISW=1,14
+CME ERROR: unknown

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