Redirect HTTP to HTTPS

You should create a Virtual Server listen on 8080 without SSL offload and assign an irule/LTM policty to redirect all HTTP request to HTTPS request at another port ( e.g 8443).

when HTTP_REQUEST { 
HTTP::redirect "https://[HTTP::host]:8443[HTTP::uri]" 
}

Create another Virtual Server listen on another port (8443) with SSL offload and assign this irule to rewrite redirect port if has

when HTTP_RESPONSE {
 Check if server response is a redirect
if { [HTTP::header is_redirect]} {
    HTTP::header replace Location https://[string map {"http://" ""} [string map ":[TCP::remote_port]/ :8443/" [HTTP::header value Location]]]
   }
}