by default, system log (e.g. /var/log/ltm) does not include application traffic. if you want to log application traffic, you can use irule.
Log Http Tcp Udp To Syslogng
You can capture client side traffic and responding server side traffic using below command::
If you want to traffic for a specific client then::
If you want write captured traffic to a file to review later in wire shark or some other tool use 'w' option and provide path to the file