MQTT Problems, its connects but doesn't send messages

first of all, don’t use <broker>. change it to something like:

mybroker.url=tcp://192.168.0.106:1883
mybroker.clientId=openhab2

Then, for your item, try:

LuzPiezaNora "Luz Pieza Nora" {mqtt=">[mybroker:/interior/pieza_nora:command:*:default]"}

Additional troubleshooting step:

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