Add 'SSL Socket Options'

etc/emq.conf

@@ -397,6 +397,17 @@ listener.ssl.external.certfile = {{ platform_etc_dir }}/certs/cert.pem
 ### Notice: 'verify' should be configured as 'verify_peer'
 ## listener.ssl.external.peer_cert_as_username = cn
 
+## SSL Socket Options
+## listener.ssl.external.backlog = 1024
+
+## listener.ssl.external.recbuf = 4KB
+
+## listener.ssl.external.sndbuf = 4KB
+
+## listener.ssl.external.buffer = 4KB
+
+## listener.ssl.external.nodelay = true
+
 ##--------------------------------------------------------------------
 ## External MQTT/WebSocket Listener