It is possible to send message from ejabberd server manually? - ejabberd

Question

I am trying to send a message from ejabberd server to the client manually. I create a module and use offline_message_hook to send the message to FCM and take action on FCM response. If I did not get any error in FCM response I try to send an acknowledgement message to the sender that message is sent to the FCM. I am using erlang to create modules for ejabberd server. When I try to send a message like this:
ejabberd_ctl:send_message("normal", From, To, "ack", "101020").
I got this error:
exception error: undefined function ejabberdctl:send_message/5
in function mod_http_offline:create_message/1 (/opt/ejabberd-modules/mod_http_offline.erl, line 36)
in call from ejabberd_hooks:safe_apply/4 (src/ejabberd_hooks.erl, line 236)
in call from ejabberd_hooks:run_fold1/4 (src/ejabberd_hooks.erl, line 217)
in call from ejabberd_sm:route/1 (src/ejabberd_sm.erl, line 146)
in call from ejabberd_router:do_route/1 (src/ejabberd_router.erl, line 399)
in call from ejabberd_router:route/1 (src/ejabberd_router.erl, line 92)
in call from ejabberd_c2s:check_privacy_then_route/2 (src/ejabberd_c2s.erl, line 855)
The error is seems like the function is not accessable for the module but I don't know what file should I need to include to use this function?
When I try to send a message like this:
XmlBody = {xmlelement, "message", [{"id", []},{"type", "normal"}, {"from", From}, {"to", To}], [{xmlelement, "body", [], [{xmlcdata, <<"Test Message">>}]}]},
ejabberd_router:route(From, To, XmlBody);
I got this error:
exception error: no function clause matching
ejabberd_router:route(<<"e5d6d83c-ea77-4d10-aaac-4e0e38899ac2">>,
<<"67456efc-be57-4cbd-a176-527de2dce19d">>,
{xmlelement,"message",
[{"id",[]},
{"type","normal"},
{"from",
<<"e5d6d83c-ea77-4d10-aaac-4e0e38899ac2">>},
{"to",
<<"67456efc-be57-4cbd-a176-527de2dce19d">>}],
[{xmlelement,"body",[],
[{xmlcdata,<<"Test Message">>}]}]}) (src/ejabberd_router.erl, line 101)
in function mod_http_offline:create_message/1 (/opt/ejabberd-modules/mod_http_offline.erl, line 38)
in call from ejabberd_hooks:safe_apply/4 (src/ejabberd_hooks.erl, line 236)
in call from ejabberd_hooks:run_fold1/4 (src/ejabberd_hooks.erl, line 217)
in call from ejabberd_sm:route/1 (src/ejabberd_sm.erl, line 146)
in call from ejabberd_router:do_route/1 (src/ejabberd_router.erl, line 399)
in call from ejabberd_router:route/1 (src/ejabberd_router.erl, line 92)
in call from ejabberd_c2s:check_privacy_then_route/2 (src/ejabberd_c2s.erl, line 855)
I did not understand this error.