From dfae87f325337bed0fe0ca96e5c2b08334f65bd8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Luis=20Mill=C3=A1n?= <jmillan@aliax.net>
Date: Sun, 6 Nov 2022 00:13:40 +0100
Subject: [PATCH 1/4] Transport: Handle keep alive request from server

Closes #754.
---
 lib/Transport.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/lib/Transport.js b/lib/Transport.js
index 33018e7..f5016e1 100644
--- a/lib/Transport.js
+++ b/lib/Transport.js
@@ -340,7 +340,18 @@ module.exports = class Transport
 
   _onData(data)
   {
-    // CRLF Keep Alive response from server. Ignore it.
+    // CRLF Keep Alive request from server, reply.
+    if (data === '\r\n\r\n')
+    {
+      logger.debug('received message with double-CRLF Keep Alive request');
+
+      // Reply with single CRLF.
+      this.socket.send('\r\n');
+
+      return;
+    }
+
+    // CRLF Keep Alive response from server, ignore it.
     if (data === '\r\n')
     {
       logger.debug('received message with CRLF Keep Alive response');

From f98bfb2d73d603a7e4f7d52bf16fb7da09769aa8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Luis=20Mill=C3=A1n?= <jmillan@aliax.net>
Date: Sun, 6 Nov 2022 00:17:21 +0100
Subject: [PATCH 2/4] Update CHANGELOG

---
 CHANGELOG.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9818cc7..db042c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+### NEXT RELEASE
+
+* Transport: Handle keep alive request from server (#791).
+
+
 ### 3.10.0
 
 * Fix typescript typings (#648).

From bc5e9807b41baea27ea533f59c207ffa0150b831 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Luis=20Mill=C3=A1n?= <jmillan@aliax.net>
Date: Mon, 7 Nov 2022 13:35:58 +0100
Subject: [PATCH 3/4] catch socket send error

---
 lib/Transport.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/Transport.js b/lib/Transport.js
index f5016e1..d2792cc 100644
--- a/lib/Transport.js
+++ b/lib/Transport.js
@@ -345,8 +345,14 @@ module.exports = class Transport
     {
       logger.debug('received message with double-CRLF Keep Alive request');
 
-      // Reply with single CRLF.
-      this.socket.send('\r\n');
+      try
+      {
+        // Reply with single CRLF.
+        this.socket.send('\r\n');
+      } catch (error)
+      {
+        logger.warn(`error sending Keep Alive response: ${error}`);
+      }
 
       return;
     }

From 6c459c446c1da06048201b77bb0bc6473e6a552d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Luis=20Mill=C3=A1n?= <jmillan@aliax.net>
Date: Mon, 7 Nov 2022 13:42:10 +0100
Subject: [PATCH 4/4] lint

---
 lib/Transport.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Transport.js b/lib/Transport.js
index d2792cc..52c6f15 100644
--- a/lib/Transport.js
+++ b/lib/Transport.js
@@ -349,7 +349,8 @@ module.exports = class Transport
       {
         // Reply with single CRLF.
         this.socket.send('\r\n');
-      } catch (error)
+      }
+      catch (error)
       {
         logger.warn(`error sending Keep Alive response: ${error}`);
       }