## Description

Hello all, I'm migrating my Kamailio logics from legacy .cfg file to KEMI script. I began with Python but switched then to Lua, but there are some subclass / functions described in KEMI documentation that seem not to be present in Lua KSR object.

In this case, I am having trouble with the subclass "kx" described [here](https://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/modules/#k...) which is used in the default Lua script example [here](https://github.com/kamailio/kamailio/blob/ca49dc0344f2ca4eae1999f6b46e0ab8c3...)

The error in the logs: ```bash app_lua [app_lua_api.c:726]: app_lua_run_ex(): error from Lua: /etc/kamailio/kamailio.lua:196: attempt to index field 'kx' (a nil value) ```

Referring to the following line in my Lua script: ```lua function ksr_route_reqinit() if not KSR.is_myself_srcip() then local srcip = KSR.kx.get_srcip(); if KSR.htable.sht_match_name("ipban", "eq", srcip) > 0 then -- ip is already blocked KSR.dbg("request from blocked IP - " .. KSR.pv.get("$rm") .. " from " .. KSR.kex.gete_furi() .. " (IP:" .. srcip .. ":" .. KSR.kex.get_srcport() .. ")\n"); KSR.x.exit(); end if KSR.pike.pike_check_req() < 0 then KSR.err("ALERT: pike blocking " .. KSR.pv.get("$rm") .. " from " .. KSR.kex.gete_furi() .. " (IP:" .. srcip .. ":" .. KSR.kex.get_srcport() .. ")\n"); KSR.htable.sht_seti("ipban", srcip, 1); KSR.x.exit(); end end end ```

- Should this function be available through KSR object ? If yes we're talking about an issue Or - Is this function not supported anymore / not with app_lua ? In this case we should fix the documentation + the example script

### Troubleshooting

Debian Jessie Kamailio 5.3 Lua 5.2

#### Reproduction

I tried different versions, all KO (Kamailio 5.2, 5.3, and last commit on master: kamailio 5.4.0-dev3 (x86_64/linux) 5afe1e)

1. Install Debian Jessie 2. Clone Kamilio GIT 3. Build from source with make (enabling the desired modules before) 4. Insert Lua script (demo one is fine to reproduce my issue)

#### Debugging Data

```bash aaaa@bbbbb:/# kamailio -V version: kamailio 5.4.0-dev3 (x86_64/linux) 5afe1e flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: 5afe1e compiled on 14:27:15 Jan 14 2020 with gcc 6.3.0 ```

#### Log Messages

```bash app_lua [app_lua_api.c:726]: app_lua_run_ex(): error from Lua: /etc/kamailio/kamailio.lua:196: attempt to index field 'kx' (a nil value) ```

#### SIP Traffic

Any message going through ksr_route_reqinit() function is triggering the error

Thanks !