From b07e5f80582fbe232ce71370433fd320ed819b9e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Grome=C5=A1?= <jgromes@users.noreply.github.com>
Date: Mon, 9 Jul 2018 11:14:57 +0200
Subject: [PATCH] ESP8266 - Implemented MQTT disconnect

---
 src/modules/ESP8266.cpp | 13 +++++++++++++
 src/modules/ESP8266.h   |  1 +
 2 files changed, 14 insertions(+)

diff --git a/src/modules/ESP8266.cpp b/src/modules/ESP8266.cpp
index 54d7860b..ad319de8 100644
--- a/src/modules/ESP8266.cpp
+++ b/src/modules/ESP8266.cpp
@@ -412,6 +412,19 @@ uint8_t ESP8266::MqttConnect(const char* host, const char* clientId, const char*
   return(ERR_RESPONSE_MALFORMED);
 }
 
+uint8_t ESP8266::MqttDisconnect() {
+  // build the DISCONNECT packet
+  uint8_t packet[2];
+  
+  // fixed header
+  packet[0] = (MQTT_DISCONNECT << 4);
+  packet[1] = 0x00;
+  
+  // send MQTT packet
+  uint8_t state = send(packet, 2);
+  return(state);
+}
+
 uint8_t ESP8266::MqttPublish(const char* topic, const char* message) {
   // encode packet length
   size_t topicLen = strlen(topic);
diff --git a/src/modules/ESP8266.h b/src/modules/ESP8266.h
index 3dd1764a..a57c5e8c 100644
--- a/src/modules/ESP8266.h
+++ b/src/modules/ESP8266.h
@@ -44,6 +44,7 @@ class ESP8266 {
     
     // MQTT methods
     uint8_t MqttConnect(const char* host, const char* clientId, const char* userName = "", const char* password = "", uint16_t keepAlive = 60, bool cleanSession = true, const char* willTopic = "", const char* willMessage = "");
+    uint8_t MqttDisconnect();
     uint8_t MqttPublish(const char* topic, const char* message);
     
     // Transport layer methods