From 7e71c29bf96658a509cbe7c8ae73b127666dd6c1 Mon Sep 17 00:00:00 2001
From: Max Prokhorov <prokhorov.max@outlook.com>
Date: Fri, 28 Dec 2018 05:15:54 +0300
Subject: [PATCH] MQTT reconnect delay based on last disconnection

---
 code/espurna/mqtt.ino | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/code/espurna/mqtt.ino b/code/espurna/mqtt.ino
index 69f11a18..882f32fa 100644
--- a/code/espurna/mqtt.ino
+++ b/code/espurna/mqtt.ino
@@ -51,6 +51,7 @@ char *_mqtt_clientid;
 #if MQTT_SKIP_RETAINED
 unsigned long _mqtt_connected_at = 0;
 #endif
+unsigned long _mqtt_disconnected_at = 0;
 
 std::vector<mqtt_callback_f> _mqtt_callbacks;
 
@@ -75,9 +76,7 @@ void _mqttConnect() {
     if (_mqtt.connected()) return;
 
     // Check reconnect interval
-    static unsigned long last = 0;
-    if (millis() - last < _mqtt_reconnect_delay) return;
-    last = millis();
+    if (millis() - _mqtt_disconnected_at < _mqtt_reconnect_delay) return;
 
     // Increase the reconnect delay
     _mqtt_reconnect_delay += MQTT_RECONNECT_DELAY_STEP;
@@ -414,6 +413,8 @@ void _mqttOnConnect() {
 
 void _mqttOnDisconnect() {
 
+    _mqtt_disconnected_at = millis();
+
     DEBUG_MSG_P(PSTR("[MQTT] Disconnected!\n"));
 
     // Send disconnect event to subscribers