From 5c1af60e194e434738f3a31a284fa182e14c814f Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Fri, 15 Apr 2016 00:35:47 +0300
Subject: [PATCH] extmod/modlwip: More debug messages for various edge
 conditions.

---
 extmod/modlwip.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/extmod/modlwip.c b/extmod/modlwip.c
index 73beeb0715..4499aa9b37 100644
--- a/extmod/modlwip.c
+++ b/extmod/modlwip.c
@@ -309,6 +309,7 @@ STATIC err_t _lwip_tcp_accept(void *arg, struct tcp_pcb *newpcb, err_t err) {
     tcp_recv(newpcb, _lwip_tcp_recv_unaccepted);
 
     if (socket->incoming.connection != NULL) {
+        DEBUG_printf("_lwip_tcp_accept: Tried to queue >1 pcb waiting for accept\n");
         // We need to handle this better. This single-level structure makes the
         // backlog setting kind of pointless. FIXME
         return ERR_BUF;
@@ -579,6 +580,7 @@ STATIC mp_obj_t lwip_socket_close(mp_obj_t self_in) {
                 socket_is_listener = true;
             }
             if (tcp_close(socket->pcb.tcp) != ERR_OK) {
+                DEBUG_printf("lwip_close: had to call tcp_abort()\n");
                 tcp_abort(socket->pcb.tcp);
             }
             break;