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To set up a MQTT publisher in codesys the following libraries are necessary to use:

• WagoSysPlainMem
• WagoAppCloud

The functionblock MQTT_Publisher was then created , with the following code:

FUNCTION_BLOCK MQTTPublisher
VAR_INPUT
    topic : STRING(255);
    xtrigger : BOOL;
    message : STRING;
END_VAR
VAR
    mqttPub : wagoappcloud.FbPublishMQTT_2(econnection := econnectionid.Connection1);
    dwSize : DWORD;
    aData : ARRAY[0..100] OF BYTE;
    xRetain : BOOL := FALSE;
    xError : BOOL := FALSE;
    xBusy : BOOL := FALSE;
    eQualityOfService : eQualityOfService := 1;

END_VAR

wagosysplainmem.MemCopy(pDest:=ADR(aData),pSource:=ADR(message),udiSize:=TO_WORD(len(message))); 
mqttPub(sTopic:=topic,eQualityOfService:=eQualityOfService,xRetain:=xRetain,dwSize:=TO_WORD(len(message)),aData:=aData,xTrigger:=xtrigger,xBusy=>xBusy,xError=>xError);