It will be easier if you create a filter based on the source if you are talking about just one device.
To be more precise, create a very generic filter that breaks down the main syslog and gives you the host IP/name .
Then create a new filter based on that field. it will be something like:
if [host] == "the_host_you_want" { grok {
Of course grok can be anything else and the field will be named whatever you want.
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