Send an event to all clients listening for session callbacks.
The returned strings of the clients are accumulated and returned as an array
of jack_session_command_t. its terminated by reti.uuid == NULL target ==
NULL means send to all interested clients. otherwise a clientname
Send an event to all clients listening for session callbacks.
The returned strings of the clients are accumulated and returned as an array of jack_session_command_t. its terminated by reti.uuid == NULL target == NULL means send to all interested clients. otherwise a clientname