0094-Handle-missing-IP-address-resolution.patch

From 2bd81ee3674c87420c5c571b77cf75cff629f540 Mon Sep 17 00:00:00 2001
From: giulcioffi <g.cioffi@arduino.cc>
Date: Wed, 14 Jul 2021 10:25:40 +0200
Subject: [PATCH 094/157] Handle missing IP address resolution

---
 .../GEMALTO_CINTERION_CellularStack.cpp        | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/connectivity/drivers/cellular/GEMALTO/CINTERION/GEMALTO_CINTERION_CellularStack.cpp b/connectivity/drivers/cellular/GEMALTO/CINTERION/GEMALTO_CINTERION_CellularStack.cpp
index 13c1a0b2fa..9eb3e27b39 100644
--- a/connectivity/drivers/cellular/GEMALTO/CINTERION/GEMALTO_CINTERION_CellularStack.cpp
+++ b/connectivity/drivers/cellular/GEMALTO/CINTERION/GEMALTO_CINTERION_CellularStack.cpp
@@ -172,11 +172,19 @@ nsapi_error_t GEMALTO_CINTERION_CellularStack::gethostbyname(const char *host, S
         _at.cmd_start_stop("^SISX" , "=" , "%s%d%s", "HostByName" , _cid, host);
         _at.resp_start("^SISX: \"HostByName\",");
         char ipAddress[NSAPI_IP_SIZE];
-        _at.read_string(ipAddress, sizeof(ipAddress));
-        _at.restore_at_timeout();
-        if (!address->set_ip_address(ipAddress)) {
-            _at.unlock();
-            return NSAPI_ERROR_DNS_FAILURE;
+        int size = _at.read_string(ipAddress, sizeof(ipAddress));
+        if (size) {
+            //Valid string received
+            tr_info("Read %d bytes. Valid string: %s\n", size, ipAddress);
+            _at.restore_at_timeout();
+            if (!address->set_ip_address(ipAddress)) {
+                _at.unlock();
+                return NSAPI_ERROR_DNS_FAILURE;
+            }
+        } else {
+            //Null string received
+            tr_info("Read %d bytes. Null string\n", size);
+            return NSAPI_ERROR_NO_ADDRESS;
         }
     }
 
-- 
2.36.0