From 2abb078f27e61c1db7a9008dbdf2bf424c0eb0c7 Mon Sep 17 00:00:00 2001
From: Hasnain Virk <hasnain.virk@arm.com>
Date: Thu, 16 Feb 2017 00:49:19 +0200
Subject: [PATCH] Adding PPP link status callback

mbed_ppp_init() is extended to take a function ptr.
ppp_lwip will call this callback upon a change in ppp link status.
in the beginning, the Ublox driver waits until the PPP link is established properly.
---
 features/FEATURE_LWIP/lwip-interface/ppp_lwip.cpp | 10 ++++++----
 features/FEATURE_LWIP/lwip-interface/ppp_lwip.h   |  4 +---
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/features/FEATURE_LWIP/lwip-interface/ppp_lwip.cpp b/features/FEATURE_LWIP/lwip-interface/ppp_lwip.cpp
index da0ec45202..6280b66aa3 100644
--- a/features/FEATURE_LWIP/lwip-interface/ppp_lwip.cpp
+++ b/features/FEATURE_LWIP/lwip-interface/ppp_lwip.cpp
@@ -38,6 +38,8 @@ extern "C" { // "pppos.h" is missing extern C
 
 #include "lwip_stack.h"
 
+static void (*notify_ppp_link_status_cb)(int) = 0;
+
 namespace mbed {
 
 using rtos::Thread;
@@ -187,6 +189,8 @@ static void ppp_link_status(ppp_pcb *pcb, int err_code, void *ctx)
         }
     }
 
+    notify_ppp_link_status_cb(err_code);
+
 #if 0
     /*
      * This should be in the switch case, this is put outside of the switch
@@ -307,13 +311,11 @@ err_t ppp_lwip_if_init(struct netif *netif, FileHandle *stream)
     return ppp_connect(my_ppp_pcb, 0);
 }
 
-#include "drivers/BufferedSerial.h"
-using mbed::BufferedSerial;
-
 static struct netif my_ppp_netif;
 
-nsapi_error_t mbed_ppp_init(FileHandle *stream)
+nsapi_error_t mbed_ppp_init(FileHandle *stream, void (*link_status)(int))
 {
+    notify_ppp_link_status_cb = link_status;
     mbed_lwip_init();
     ppp_lwip_if_init(&my_ppp_netif, stream);
 
diff --git a/features/FEATURE_LWIP/lwip-interface/ppp_lwip.h b/features/FEATURE_LWIP/lwip-interface/ppp_lwip.h
index f1e55e44e0..06f51c90c5 100644
--- a/features/FEATURE_LWIP/lwip-interface/ppp_lwip.h
+++ b/features/FEATURE_LWIP/lwip-interface/ppp_lwip.h
@@ -10,10 +10,8 @@
 
 namespace mbed {
 
-void ppp_bringup_test();
-
 NetworkStack *mbed_ppp_get_stack();
-nsapi_error_t mbed_ppp_init(FileHandle *stream);
+nsapi_error_t mbed_ppp_init(FileHandle *stream, void (*link_status)(int));
 
 }