Filtering client IP using HSL in irules

We have the following hsl configured on the irule which works just fine with all the traffic. I need to add a filter on the below HSL config to log traffic only from specific client IP addresses. Any guidance is appreciated.

when HTTP_REQUEST {

 

set hsl [HSL::open -proto UDP -pool SYSLOG_POOL] set http_request_time [clock clicks -milliseconds] HTTP::collect 4096 set LogString "<190> [IP::client_addr]:[TCP::client_port]->[IP::local_addr]:[TCP::local_port]; [HTTP::host]"

 

host header translation function

HSL::send $hsl "$LogString REQUEST HOST HEADER TRANSLATED -----> [HTTP::host]"

 

}

 

when HTTP_RESPONSE {

 

set hsl [HSL::open -proto UDP -pool SYSLOG_POOL] HSL::send $hsl "[IP::client_addr]:[TCP::client_port]->[IP::local_addr]:[TCP::local_port] RESPONSE FROM SERVER ---> [LB::server])"

 

}