From 0e2d6c322bba946ea9fc3a4e5d2d0dfe9070db3b Mon Sep 17 00:00:00 2001
From: Folkert van Heusden <mail@vanheusden.com>
Date: Fri, 7 Sep 2018 21:39:45 +0200
Subject: [PATCH] Update PubSubClient.cpp

Make sure all data is flushed to the other end when doing a disconnect(): that way we know for sure that it is there when we disconnect the wifi or maybe even reboot.
This change was made after I noticed that I did not get any mqtt messages. I verified that it indeed solves the problem. Example code on request.
---
 src/PubSubClient.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/PubSubClient.cpp b/src/PubSubClient.cpp
index 29fbbfa..3c5c5f7 100755
--- a/src/PubSubClient.cpp
+++ b/src/PubSubClient.cpp
@@ -524,6 +524,7 @@ void PubSubClient::disconnect() {
     buffer[1] = 0;
     _client->write(buffer,2);
     _state = MQTT_DISCONNECTED;
+    _client->flush();
     _client->stop();
     lastInActivity = lastOutActivity = millis();
 }