TRB255 - MQTT Azure Event Grid

I would like to connect my TRB255 to Azure Event Grid.
The goal is to forward data from a modbus RS485 meter to the Event Grid.

I generated the ‘simple’ certificates on my device.

I created a MQTT broker with a bridge to Azure Event Grid.
I can connect locally to the MQTT broker with a client but messages are not relayed to and from the Event Grid Broker.

I also setup the Modbus MQTT gateway but even if i push messages to the local broker as documented i do not receive any modbus responses.

Any tips or best practices? Is it possible to bridge to a remote MQTT broker that is not in the LAN network without extra ports / forwarding?

Thanks in advance!!

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