From cae643434576c0cc3b631c3a5b72ea524f0203e0 Mon Sep 17 00:00:00 2001
From: Luca Boccassi <luca.boccassi@gmail.com>
Date: Sat, 28 Apr 2018 12:35:36 +0100
Subject: [PATCH] Problem: HEARTBEAT command breaks REQ connection

Solution: ignore command messages in the REQ session to avoid
disrupting the state machine.
Commands are handled by the engine before handing off to the session.
---
 src/req.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/req.cpp b/src/req.cpp
index 4342048d..ca9718df 100644
--- a/src/req.cpp
+++ b/src/req.cpp
@@ -285,6 +285,11 @@ zmq::req_session_t::~req_session_t ()
 
 int zmq::req_session_t::push_msg (msg_t *msg_)
 {
+    //  Ignore commands, they are processed by the engine and should not
+    //  affect the state machine.
+    if (unlikely (msg_->flags () & msg_t::command))
+        return 0;
+
     switch (state) {
         case bottom:
             if (msg_->flags () == msg_t::more) {