From a506973d0f428516e9ee31516b70b589052f53ef Mon Sep 17 00:00:00 2001
From: Christopher Haster <chaster@utexas.edu>
Date: Thu, 9 Jun 2016 05:51:28 -0500
Subject: [PATCH] Fixed behaviour of get_ip_address and get_mac_address for
 LWIPInterface

per the socket API documentation:

  /** Get the local IP address
   *
   *  @return         Null-terminated representation of the local IP address
   *                  or null if not yet connected
   */
  virtual const char *get_ip_address() = 0;

LWIPInterface incorrectly returned "\0" if unconnected
---
 net/LWIPInterface/LWIPInterface.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/LWIPInterface/LWIPInterface.cpp b/net/LWIPInterface/LWIPInterface.cpp
index 94e72ece7c..a47cdbdbdf 100644
--- a/net/LWIPInterface/LWIPInterface.cpp
+++ b/net/LWIPInterface/LWIPInterface.cpp
@@ -124,12 +124,12 @@ int LWIPInterface::disconnect()
 
 const char *LWIPInterface::get_ip_address()
 {
-    return ip_addr;
+    return ip_addr[0] ? ip_addr : 0;
 }
 
 const char *LWIPInterface::get_mac_address()
 {
-    return mac_addr;
+    return mac_addr[0] ? mac_addr : 0;
 }
 
 struct lwip_socket {