"client_id" in lua script

[ecdlguy--- via dovecot]

Hi,

I'm trying to block specific MUAs, like e.g. Outlook-App for iOS and Android or 
Xiaomi Mail / MiMail using a lua script.
While implementing this, I noticed that "client_id" is always nil in the lua 
script or I am doing something wrong.
This is part of the postfix config:

imap_id_retain = yes
imap_id_log = *
passdb {
  driver = lua
  args = file=/etc/dovecot/lua/badimapid.lua blocking=yes
}

Logging (imap_id_log = *) works, the dovecot log has entries like: 

imap(user@domain)<226><pWFZx9siRt+CUwMp>: ID sent: name=Thunderbird, 
version=115.15.0

Here is the content of the lua-script file:

function auth_passdb_lookup(req)
    req.log_info('badimapid info: user="'..req.user..'", 
client_id="'..req.client_id..'"')
    return dovecot.auth.PASSDB_RESULT_NEXT, ""
end
function script_init()
    return 0
end
function script_deinit()
end

In principle, "req.client_id" should contain the client id string according to 
https://doc.dovecot.org/2.3/configuration_manual/authentication/lua_based_authentication/

However, dovecot log reads:

auth-worker(163): Error: conn unix:auth-worker (pid=162,uid=401): 
auth-worker<27>: lua(user@domain): db-lua: lua_pcall(auth_passdb_lookup, 1, 2) 
failed: /etc/dovecot/lua/badimapid.lua:2: attempt to concatenate a nil value 
(field 'client_id')

Why is client_id nil?

Thanks,
Thorsten
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