From e344a37dd1ffb21aac90dc028cb205d233270458 Mon Sep 17 00:00:00 2001
From: Alexander Entinger <cto@lxrobotics.com>
Date: Tue, 28 Jul 2020 15:48:34 +0200
Subject: [PATCH] Don't ack within 'read' if we are having a callback
 registered and reading from within the callback

---
 src/MqttClient.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/MqttClient.cpp b/src/MqttClient.cpp
index feef510..04e16c2 100644
--- a/src/MqttClient.cpp
+++ b/src/MqttClient.cpp
@@ -713,7 +713,9 @@ int MqttClient::read(uint8_t *buf, size_t size)
       _rxLength -= result;
 
       if (_rxLength == 0) {
-        ackRxMessage();
+        if (!_onMessage) {
+          ackRxMessage();
+        }
 
         _rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
       }