iRule if based on incoming IP

Not sure if this is the cause of your issue but you don't need to put the IP address in quotes, try it without as per the wiki: https://clouddocs.f5.com/api/irules/IP__client_addr.html 

  if {[IP::addr [IP::client_addr] equals 10.8.199.231%3]} {
        log local0. "IDMS dupa"
    }