When to use MQTT mosca broker

hi, in this tutorial mqtt node red ttn and aws he doesnt add the mosca broker, just take a mqtt out block (for me it acts just as a publisher) and send the data to aws(amazon web services) where he emulates a mqtt client but where is the broker? , thanks

I moved this into #general as it isn't query about writing your own node-red node

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It is from the section headed " Get the Endpoint adress to configure Node-RED on the Step 6". Search for that string in the tutorial to find it.