It is sometimes useful to have an item echo back a particular value. Here is a short list of ideas:

• echo[] item can be used for concatenating strings: echo["{$SOFTWARE} {$VERSION}"];
• in low-level discovery, it can be used to echo a discovered value: echo["{#SOFTWARE.VERSION}"];
• in an issue like ZBXNEXT-2827, it can be used to work around places where a macro is not allowed, but an item is: echo["{HOST.NAME}"].

Another useful function would be a true() trigger function that would always be true. It is useful when we wish to trigger on any received value, for instance, errors in a log file. Currently, people have to use something like host:item.strlen()>0.