Custom IPS Signature for allowing traffic on UDP port 161

Hi recently I have some equipment which utlises port 161 to transfer data into my server. Somehow SEPM is blocking the traffic on port 161. I should create a custom IPS signature to allow traffic on this port ?

If yes, should i leave the content syntax blank so that it will allow all traffics at this port ? 

I search through the forum and usually the disccussion is on blocking of ports, websites and services. please help. Thank you