Mavlink: start filtering using system id?

Topic

Should we use the system_id that currently we ignore to filter messages managed by the MessageBroker? Should we filter during transmission, reception or both?

Context

Actually we do not filter messages based on their system_id, but this may be essential in a future use with the ARP system deployed, since a replay of messages with different targets (system_id) may appear on the network.

What you've tried

Mention any solutions or documentation you already checked.

Expected Outcome

What kind of answer or discussion are you hoping for?