From 1cacf92ce1538c26fc663ae70714a0df5044fda2 Mon Sep 17 00:00:00 2001
From: david gauchard <gauchard@laas.fr>
Date: Fri, 1 Feb 2019 18:33:26 +0100
Subject: [PATCH] stop lwIP dhcp client when WiFi goes off. (#5703)

* stop lwIP dhcp client with WiFi goes off.

* stop dhcp-client when really unused
---
 libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp b/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp
index a6239dece..e1a3583ff 100644
--- a/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp
+++ b/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp
@@ -389,6 +389,11 @@ bool ESP8266WiFiGenericClass::mode(WiFiMode_t m) {
 
     bool ret = false;
 
+    if (m != WIFI_STA && m != WIFI_AP_STA)
+        // calls lwIP's dhcp_stop(),
+        // safe to call even if not started
+        wifi_station_dhcpc_stop();
+
     ETS_UART_INTR_DISABLE();
     if(_persistent) {
         ret = wifi_set_opmode(m);