{
"port": 0,
"tcp_mode": 0,
"stream_id": "string"
}curl --location 'http://127.0.0.1:8086/zlm/api/rtp/server/open-multiplex' \
--header 'Content-Type: application/json' \
--data '{
"port": 0,
"tcp_mode": 0,
"stream_id": "string"
}'{
"port": "string",
"code": "string"
}