Notify tenant's guest or partner about they being added (SSTI API Example)

// Server API
// Commands:
integer SSTI_SERV_API_CUSTOM_BUTTON=-45050001;
integer SSTI_SERV_API_GET_GROUP=-45050002;
integer SSTI_SERV_API_GET_CLOUD=-45050003;
integer SSTI_SERV_API_BOX_CUSTOM_BUTTON=-45050004;
integer SSTI_SERV_API_GET_PARAM=-45050005;
integer SSTI_SERV_API_CUSTOM_HTTP_BUTTONS=-45050006;
integer SSTI_SERV_API_HTTP_REPLY=-45050007;
 
// Events:
integer SSTI_SERV_EVENT_INITIALIZED=-45060001;
integer SSTI_SERV_EVENT_CUSTOM_BUTTON=-45060002;
integer SSTI_SERV_EVENT_GROUP=-45060003;
integer SSTI_SERV_EVENT_CLOUD=-45060004;
integer SSTI_SERV_EVENT_BOX_CUSTOM_BUTTON=-45060005;
integer SSTI_SERV_EVENT_PARAM=-45060006;
integer SSTI_SERV_EVENT_RESET=-45060007;
integer SSTI_SERV_EVENT_LOCALURL=-45060008;
integer SSTI_SERV_EVENT_HTTPBUTTON=-45060009;
integer SSTI_SERV_EVENT_TENANT=-45060010;
integer SSTI_SERV_EVENT_NEW_GUESTPARTNER=-45060011;
integer SSTI_SERV_EVENT_GUESTPARTNER_REMOVED=-45060012;

//
// Example code starts here
default {
    link_message(integer sender, integer cmd, string str, key id) {
        // Track invitations
        if(cmd == SSTI_SERV_EVENT_NEW_GUESTPARTNER) {
            llOwnerSay("New guest/partner: " + str);
 
            list parts = llParseStringKeepNulls(str, [";"], []);
            string type = llList2String(parts, 0);
            string tenant = llList2String(parts, 1);
            key tenant_uuid = llList2Key(parts, 2);
            key box_uuid = llList2String(parts, 3);
            string box_loc = llList2String(parts, 4);
 
            llInstantMessage(id, "Dear resident, you has been added as a " +
                type + ":\n" +
                "tenant: " + tenant + " (" + (string)tenant_uuid + ")\n" +
                "box: " + box_loc + " (" + (string)box_uuid + ")\n");
        }
 
        // Track removal
        if(cmd == SSTI_SERV_EVENT_GUESTPARTNER_REMOVED) {
            llOwnerSay("Removed guest/partner: " + str);
 
            list parts = llParseStringKeepNulls(str, [";"], []);
            string type = llList2String(parts, 0);
            string tenant = llList2String(parts, 1);
            key tenant_uuid = llList2Key(parts, 2);
            key box_uuid = llList2String(parts, 3);
            string box_loc = llList2String(parts, 4);
 
            llInstantMessage(id, "Dear resident, you are not a " +
                type + " of " + tenant + " anymore\n" + 
                "(box " + (string)box_uuid + " at " + box_loc + ")");
        }
    }
}