What is the purpose of FreeSWITCH's `mod_esl`?
问题 There is another question trying to figure out the connection between mod_event_socket and the Event Socket Library (ESL). The Event Socket Library itself is a C library (libesl) that can be used to build external C applications to control FreeSWITCH via its event system. As far as I understand, mod_esl is only a FreeSWITCH module wrapper around libesl, used to extend programming languages with the same functionality (i.e., to control a FreeSWITCH instance). The documentation doesn't mention