Add support TCP KeepAlive for ESP32 and ESP8266.

mobizt · Jun 17, 2023 · 3dce722 · 3dce722
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diff --git a/README.md b/README.md
@@ -397,6 +397,7 @@ In case you only want to exclude the error flash string from library, please com
 
 ### Using TCP session KeepAlive in ESP8266 and ESP32
 
+The server connection will be probed at some intervals to maintain connection.
 
 The TCP session KeepAlive can be enabled from executing `<SMTPSession>.keepAlive` or `<IMAPSession>.keepAlive` with providing TCP options as arguments, i.e.,
 

diff --git a/examples/IMAP/Mailbox_Changes_Notification/Mailbox_Changes_Notification.ino b/examples/IMAP/Mailbox_Changes_Notification/Mailbox_Changes_Notification.ino
@@ -217,7 +217,11 @@ void setup()
      * in case of lost internet connection for re-listening the mailbox.
      */
     config.network_connection_handler = connectWiFi;
-
+
+    // You can use TCP KeepAlive for more reliable of listen (idle) operation, please read this for detail.
+    // https://github.com/mobizt/ESP-Mail-Client#using-tcp-session-keepalive-in-esp8266-and-esp32
+    // You can use keepAlive in ESP8266 core version newer than v3.1.2.
+    // Or you can use git version (v3.1.2) https://github.com/esp8266/Arduino
 #if defined(ESP32)
     imap.keepAlive(5, 5, 1);
 #endif