Hello there when I start developing a plugin I config LS in debug mode 2.
Then, how can I send debug messages inside the web interface or inside a logfile, from my plugin?
is there something like $this->addMessageDebug($variable) inside PluginBase I extended?
Can I do the same with notice, warns and errors?
Also, on errors, is it enough to try catch throw a general \Exception?
Sorry for writing this but I can't find a useful documentation on plugin writing.
Thanks in advance.

you can use within your Plugin
it will create a file /tmp/runtime/plugin.log

in file by default, but you can do what you want

www.limesurvey.org/manual/Optional_settings#Logging_settings