Merge branch 'docs/add_sniffer_use_limit_v3.1' into 'release/v3.1'

Add sniffer or promiscuous mode use limit （backport v3.1） See merge request sdk/ESP8266_RTOS_SDK!754
espressif · Jan 30, 2019 · 6fe1882 · 6fe1882
2 parents d00fb29 + e1c7364
commit 6fe1882
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/docs/en/api-reference/wifi/esp_wifi.rst b/docs/en/api-reference/wifi/esp_wifi.rst
@@ -14,6 +14,12 @@ The WiFi libraries provide support for configuring and monitoring the ESP8266 Wi
 - Scanning for access points (active & passive scanning).
 - Promiscuous mode monitoring of IEEE802.11 WiFi packets.
 
+Important
+^^^^^^^^^
+
+Since the ESP8266 RTOS SDK V3.0, we moved some functions from IRAM to flash, including `malloc` and `free` fucntions, to save more memory.
+In this case, please do not read/write/erase flash during sniffer or promiscuous mode. You need to disable the sniffer or promiscuous mode at first, then read/write/erase flash.
+
 Application Examples
 --------------------