From f4c37bb2b6fa7c627acd80282304db4626f59941 Mon Sep 17 00:00:00 2001
From: giulcioffi <g.cioffi@arduino.cc>
Date: Tue, 5 Jan 2021 10:25:32 +0100
Subject: [PATCH] Retry send up to 5 times, then close socket

---
 src/WiFiClient.cpp | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/src/WiFiClient.cpp b/src/WiFiClient.cpp
index bfc21ec7..2d75cdc0 100644
--- a/src/WiFiClient.cpp
+++ b/src/WiFiClient.cpp
@@ -207,19 +207,29 @@ size_t WiFiClient::write(const uint8_t *buf, size_t size) {
   if (size==0)
   {
 	  setWriteError();
-      return 0;
+    return 0;
   }
 
-  size_t written = ServerDrv::sendData(_sock, buf, size);
-  if (!written)
-  {
-	  setWriteError();
-      return 0;
+  bool success = false;
+  size_t written = 0;
+  for (int i=0; i<5; i++) {
+    written = ServerDrv::sendData(_sock, buf, size);
+    if (written) {
+      success = true;
+      break;
+    }
   }
-  if (!ServerDrv::checkDataSent(_sock))
-  {
-	  setWriteError();
-      return 0;
+  if (success) {
+    if (!ServerDrv::checkDataSent(_sock))
+    {
+      setWriteError();
+        return 0;
+    }
+  } else {
+    // close socket
+    ServerDrv::stopClient(_sock);
+    setWriteError();
+    return 0;
   }
 
   return written;