alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"🐾 - ℹ TP-Link IOT 🤖"; flow:to_client, stateless; threshold:type limit, track by_dst,count 1, seconds 86400; tls.cert_subject; content:"CN=*.i.tplinknbu.com"; nocase; reference:url,https://www.tp-link.com/; metadata:created_at 2021_08_13, updated_at 2022_06_15; sid:3300779; rev:3; classtype:misc-activity;)