Merge branch 'iotssl-683-travis-failing-intermittently'
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index d9b37e0..a617d06 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2469,6 +2469,8 @@
 //#define MBEDTLS_PLATFORM_STD_PRINTF        printf /**< Default printf to use, can be undefined */
 /* Note: your snprintf must correclty zero-terminate the buffer! */
 //#define MBEDTLS_PLATFORM_STD_SNPRINTF    snprintf /**< Default snprintf to use, can be undefined */
+//#define MBEDTLS_PLATFORM_STD_EXIT_SUCCESS       0 /**< Default exit value to use, can be undefined */
+//#define MBEDTLS_PLATFORM_STD_EXIT_FAILURE       1 /**< Default exit value to use, can be undefined */
 
 /* To Use Function Macros MBEDTLS_PLATFORM_C must be enabled */
 /* MBEDTLS_PLATFORM_XXX_MACRO and MBEDTLS_PLATFORM_XXX_ALT cannot both be defined */
diff --git a/include/mbedtls/debug.h b/include/mbedtls/debug.h
index 7d944f3..2957996 100644
--- a/include/mbedtls/debug.h
+++ b/include/mbedtls/debug.h
@@ -97,7 +97,7 @@
 void mbedtls_debug_set_threshold( int threshold );
 
 /**
-* \brief    Print a message to the debug output. This function is always used
+ * \brief    Print a message to the debug output. This function is always used
  *          through the MBEDTLS_SSL_DEBUG_MSG() macro, which supplies the ssl
  *          context, file and line number parameters.
  *
diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index f71f1b6..1371ff1 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -64,7 +64,13 @@
 #define MBEDTLS_PLATFORM_STD_FREE       free /**< Default free to use */
 #endif
 #if !defined(MBEDTLS_PLATFORM_STD_EXIT)
-#define MBEDTLS_PLATFORM_STD_EXIT      exit /**< Default free to use */
+#define MBEDTLS_PLATFORM_STD_EXIT      exit /**< Default exit to use */
+#endif
+#if !defined(MBEDTLS_PLATFORM_STD_EXIT_SUCCESS)
+#define MBEDTLS_PLATFORM_STD_EXIT_SUCCESS  EXIT_SUCCESS /**< Default exit value to use */
+#endif
+#if !defined(MBEDTLS_PLATFORM_STD_EXIT_FAILURE)
+#define MBEDTLS_PLATFORM_STD_EXIT_FAILURE  EXIT_FAILURE /**< Default exit value to use */
 #endif
 #else /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
 #if defined(MBEDTLS_PLATFORM_STD_MEM_HDR)
@@ -207,6 +213,20 @@
 #endif /* MBEDTLS_PLATFORM_EXIT_MACRO */
 #endif /* MBEDTLS_PLATFORM_EXIT_ALT */
 
+/*
+ * The default exit values
+ */
+#if defined(MBEDTLS_PLATFORM_STD_EXIT_SUCCESS)
+#define MBEDTLS_EXIT_SUCCESS MBEDTLS_PLATFORM_STD_EXIT_SUCCESS
+#else
+#define MBEDTLS_EXIT_SUCCESS 0
+#endif
+#if defined(MBEDTLS_PLATFORM_STD_EXIT_FAILURE)
+#define MBEDTLS_EXIT_FAILURE MBEDTLS_PLATFORM_STD_EXIT_FAILURE
+#else
+#define MBEDTLS_EXIT_FAILURE 1
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/programs/test/selftest.c b/programs/test/selftest.c
index b168b71..6ca07bb 100644
--- a/programs/test/selftest.c
+++ b/programs/test/selftest.c
@@ -52,15 +52,18 @@
 #include "mbedtls/ecjpake.h"
 #include "mbedtls/timing.h"
 
-#include <stdio.h>
 #include <string.h>
 
 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
+#include <stdlib.h>
 #define mbedtls_printf     printf
 #define mbedtls_snprintf   snprintf
+#define mbedtls_exit       exit
+#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
 #endif
 
 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
@@ -99,8 +102,7 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0, v, suites_tested = 0, suites_failed = 0,
-        exitcode = EXIT_SUCCESS;
+    int v, suites_tested = 0, suites_failed = 0;
 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
     unsigned char buf[1000000];
 #endif
@@ -115,7 +117,7 @@
     if( pointer != NULL )
     {
         mbedtls_printf( "all-bits-zero is not a NULL pointer\n" );
-        return( 1 );
+        mbedtls_exit( MBEDTLS_EXIT_FAILURE );
     }
 
     /*
@@ -124,7 +126,7 @@
     if( run_test_snprintf() != 0 )
     {
         mbedtls_printf( "the snprintf implementation is broken\n" );
-        return( 0 );
+        mbedtls_exit( MBEDTLS_EXIT_FAILURE );
     }
 
     if( argc == 2 && ( strcmp( argv[1], "--quiet" ) == 0  ||
@@ -145,7 +147,7 @@
 #endif
 
 #if defined(MBEDTLS_MD2_C)
-    if( ( ret = mbedtls_md2_self_test( v ) ) != 0 )
+    if( mbedtls_md2_self_test( v )  != 0 )
     {
         suites_failed++;
     }
@@ -153,7 +155,7 @@
 #endif
 
 #if defined(MBEDTLS_MD4_C)
-    if( ( ret = mbedtls_md4_self_test( v ) ) != 0 )
+    if( mbedtls_md4_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -161,7 +163,7 @@
 #endif
 
 #if defined(MBEDTLS_MD5_C)
-    if( ( ret = mbedtls_md5_self_test( v ) ) != 0 )
+    if( mbedtls_md5_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -169,7 +171,7 @@
 #endif
 
 #if defined(MBEDTLS_RIPEMD160_C)
-    if( ( ret = mbedtls_ripemd160_self_test( v ) ) != 0 )
+    if( mbedtls_ripemd160_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -177,7 +179,7 @@
 #endif
 
 #if defined(MBEDTLS_SHA1_C)
-    if( ( ret = mbedtls_sha1_self_test( v ) ) != 0 )
+    if( mbedtls_sha1_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -185,7 +187,7 @@
 #endif
 
 #if defined(MBEDTLS_SHA256_C)
-    if( ( ret = mbedtls_sha256_self_test( v ) ) != 0 )
+    if( mbedtls_sha256_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -193,7 +195,7 @@
 #endif
 
 #if defined(MBEDTLS_SHA512_C)
-    if( ( ret = mbedtls_sha512_self_test( v ) ) != 0 )
+    if( mbedtls_sha512_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -201,7 +203,7 @@
 #endif
 
 #if defined(MBEDTLS_ARC4_C)
-    if( ( ret = mbedtls_arc4_self_test( v ) ) != 0 )
+    if( mbedtls_arc4_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -209,7 +211,7 @@
 #endif
 
 #if defined(MBEDTLS_DES_C)
-    if( ( ret = mbedtls_des_self_test( v ) ) != 0 )
+    if( mbedtls_des_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -217,7 +219,7 @@
 #endif
 
 #if defined(MBEDTLS_AES_C)
-    if( ( ret = mbedtls_aes_self_test( v ) ) != 0 )
+    if( mbedtls_aes_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -225,7 +227,7 @@
 #endif
 
 #if defined(MBEDTLS_GCM_C) && defined(MBEDTLS_AES_C)
-    if( ( ret = mbedtls_gcm_self_test( v ) ) != 0 )
+    if( mbedtls_gcm_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -233,7 +235,7 @@
 #endif
 
 #if defined(MBEDTLS_CCM_C) && defined(MBEDTLS_AES_C)
-    if( ( ret = mbedtls_ccm_self_test( v ) ) != 0 )
+    if( mbedtls_ccm_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -241,7 +243,7 @@
 #endif
 
 #if defined(MBEDTLS_BASE64_C)
-    if( ( ret = mbedtls_base64_self_test( v ) ) != 0 )
+    if( mbedtls_base64_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -249,7 +251,7 @@
 #endif
 
 #if defined(MBEDTLS_BIGNUM_C)
-    if( ( ret = mbedtls_mpi_self_test( v ) ) != 0 )
+    if( mbedtls_mpi_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -257,7 +259,7 @@
 #endif
 
 #if defined(MBEDTLS_RSA_C)
-    if( ( ret = mbedtls_rsa_self_test( v ) ) != 0 )
+    if( mbedtls_rsa_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -265,7 +267,7 @@
 #endif
 
 #if defined(MBEDTLS_X509_USE_C)
-    if( ( ret = mbedtls_x509_self_test( v ) ) != 0 )
+    if( mbedtls_x509_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -273,7 +275,7 @@
 #endif
 
 #if defined(MBEDTLS_XTEA_C)
-    if( ( ret = mbedtls_xtea_self_test( v ) ) != 0 )
+    if( mbedtls_xtea_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -281,7 +283,7 @@
 #endif
 
 #if defined(MBEDTLS_CAMELLIA_C)
-    if( ( ret = mbedtls_camellia_self_test( v ) ) != 0 )
+    if( mbedtls_camellia_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -289,7 +291,7 @@
 #endif
 
 #if defined(MBEDTLS_CTR_DRBG_C)
-    if( ( ret = mbedtls_ctr_drbg_self_test( v ) ) != 0 )
+    if( mbedtls_ctr_drbg_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -297,7 +299,7 @@
 #endif
 
 #if defined(MBEDTLS_HMAC_DRBG_C)
-    if( ( ret = mbedtls_hmac_drbg_self_test( v ) ) != 0 )
+    if( mbedtls_hmac_drbg_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -305,7 +307,7 @@
 #endif
 
 #if defined(MBEDTLS_ECP_C)
-    if( ( ret = mbedtls_ecp_self_test( v ) ) != 0 )
+    if( mbedtls_ecp_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -313,7 +315,7 @@
 #endif
 
 #if defined(MBEDTLS_ECJPAKE_C)
-    if( ( ret = mbedtls_ecjpake_self_test( v ) ) != 0 )
+    if( mbedtls_ecjpake_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -321,7 +323,7 @@
 #endif
 
 #if defined(MBEDTLS_DHM_C)
-    if( ( ret = mbedtls_dhm_self_test( v ) ) != 0 )
+    if( mbedtls_dhm_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -329,7 +331,7 @@
 #endif
 
 #if defined(MBEDTLS_ENTROPY_C)
-    if( ( ret = mbedtls_entropy_self_test( v ) ) != 0 )
+    if( mbedtls_entropy_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -337,7 +339,7 @@
 #endif
 
 #if defined(MBEDTLS_PKCS5_C)
-    if( ( ret = mbedtls_pkcs5_self_test( v ) ) != 0 )
+    if( mbedtls_pkcs5_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -347,7 +349,7 @@
 /* Slow tests last */
 
 #if defined(MBEDTLS_TIMING_C)
-    if( ( ret = mbedtls_timing_self_test( v ) ) != 0 )
+    if( mbedtls_timing_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -367,7 +369,7 @@
 
 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
     mbedtls_memory_buffer_alloc_free();
-    if( ( ret = mbedtls_memory_buffer_alloc_self_test( v ) ) != 0 )
+    if( mbedtls_memory_buffer_alloc_self_test( v ) != 0 )
     {
         suites_failed++;
     }
@@ -393,8 +395,8 @@
     }
 
     if( suites_failed > 0)
-        exitcode = EXIT_FAILURE;
+        mbedtls_exit( MBEDTLS_EXIT_FAILURE );
 
-    exit( exitcode );
+    mbedtls_exit( MBEDTLS_EXIT_SUCCESS );
 }
 
diff --git a/scripts/config.pl b/scripts/config.pl
index d4c32fd..a6dcfe7 100755
--- a/scripts/config.pl
+++ b/scripts/config.pl
@@ -1,22 +1,73 @@
 #!/usr/bin/perl
-
-# Tune the configuration file
+#
+# This file is part of mbed TLS (https://tls.mbed.org)
+#
+# Copyright (c) 2014-2016, ARM Limited, All Rights Reserved
+#
+# Purpose
+#
+# Comments and uncomments #define lines in the given header file and optionally
+# sets their value. This is to provide scripting control of what preprocessor
+# symbols, and therefore what build time configuration flags are set in the
+# 'config.h' file.
+#
+# Usage: config.pl [-f <file> | --file <file>] [-o | --force]
+#                   [set <symbol> <value> | unset <symbol> | full | realfull]
+#
+# Full usage description provided below.
+#
+# Things that shouldn't be enabled with "full".
+#
+#   MBEDTLS_DEPRECATED_REMOVED
+#   MBEDTLS_HAVE_SSE2
+#   MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
+#   MBEDTLS_ECP_DP_M221_ENABLED
+#   MBEDTLS_ECP_DP_M383_ENABLED
+#   MBEDTLS_ECP_DP_M511_ENABLED
+#   MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
+#   MBEDTLS_NO_PLATFORM_ENTROPY
+#   MBEDTLS_REMOVE_ARC4_CIPHERSUITES
+#   MBEDTLS_SSL_HW_RECORD_ACCEL
+#   MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3
+#   MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
+#       - this could be enabled if the respective tests were adapted
+#   MBEDTLS_ZLIB_SUPPORT
+#   MBEDTLS_PKCS11_C
+#   and any symbol beginning _ALT
+#
 
 use warnings;
 use strict;
 
+my $config_file = "include/mbedtls/config.h";
 my $usage = <<EOU;
-$0 [-f <file>] unset <name>
-$0 [-f <file>] set <name> [<value>]
-EOU
-# for our eyes only:
-# $0 [-f <file>] full|realfull
+$0 [-f <file> | --file <file>] [-o | --force]
+                   [set <symbol> <value> | unset <symbol> | full | realfull]
 
-# Things that shouldn't be enabled with "full".
-# Notes:
-# - MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3 and
-#   MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION could be enabled if the
-#   respective tests were adapted
+Commands
+    set <symbol> [<value]   - Uncomments or adds a #define for the <symnol> to
+                              the configuration file, and optionally making it
+                              of <value>.
+                              If the symbol isn't present in the file an error
+                              is returned.
+    unset <symbol>          - Comments out any #define present in the
+                              configuration file.
+    full                    - Uncomments all #define's in the configuration file
+                              excluding some reserved symbols, until the 
+                              'Module configuration options' section
+    realfull                - Uncomments all #define's with no exclusions
+
+Options
+    -f | --file <filename>  - The file or file path for the configuration file
+                              to edit. When omitted, the following default is
+                              used:
+                                $config_file
+    -o | --force            - If the symbol isn't present in the configuration
+                              file when setting it's value, a #define is
+                              appended to the end of the file.
+
+EOU
+
 my @excluded = qw(
 MBEDTLS_DEPRECATED_REMOVED
 MBEDTLS_HAVE_SSE2
@@ -40,40 +91,65 @@
 PLATFORM_[A-Z0-9]+_ALT
 );
 
-my $config_file = "include/mbedtls/config.h";
+# Process the command line arguments
 
-# get -f option
-if (@ARGV >= 2 && $ARGV[0] eq "-f") {
-    shift; # -f
-    $config_file = shift;
+my $force_option = 0;
 
-    -f $config_file or die "No such file: $config_file\n";
-} else {
-    if (! -f $config_file)  {
-        chdir '..' or die;
-        -f $config_file
-            or die "Without -f, must be run from root or scripts\n"
+my ($arg, $name, $value, $action);
+
+while ($arg = shift) {
+
+    # Check if the argument is an option
+    if ($arg eq "-f" || $arg eq "--file") {
+        $config_file = shift;
+
+        -f $config_file or die "No such file: $config_file\n";
+
+    }
+    elsif ($arg eq "-o" || $arg eq "--force") {
+        $force_option = 1;
+
+    }
+    else
+    {
+        # ...else assume it's a command
+        $action = $arg;
+
+        if ($action eq "full" || $action eq "realfull") {
+            # No additional parameters
+            die $usage if @ARGV;
+
+        }
+        elsif ($action eq "unset") {
+            die $usage unless @ARGV;
+            $name = shift;
+
+        }
+        elsif ($action eq "set") {
+            die $usage unless @ARGV;
+            $name = shift;
+            $value = shift if @ARGV;
+
+        }
+        else {
+            die "Command '$action' not recognised.\n\n".$usage;
+        }
     }
 }
 
-# get action
-die $usage unless @ARGV;
-my $action = shift;
+# Check the config file is present
+if (! -f $config_file)  {
 
-my ($name, $value);
-if ($action eq "full" || $action eq "realfull") {
-    # nothing to do
-} elsif ($action eq "unset") {
-    die $usage unless @ARGV;
-    $name = shift;
-} elsif ($action eq "set") {
-    die $usage unless @ARGV;
-    $name = shift;
-    $value = shift if @ARGV;
-} else {
-    die $usage;
+    chdir '..' or die;
+
+    # Confirm this is the project root directory and try again
+    if ( !(-d 'scripts' && -d 'include' && -d 'library' && -f $config_file) ) {
+        die "If no file specified, must be run from the project root or scripts directory.\n";
+    }
 }
-die $usage if @ARGV;
+
+
+# Now read the file and process the contents
 
 open my $config_read, '<', $config_file or die "read $config_file: $!\n";
 my @config_lines = <$config_read>;
@@ -122,9 +198,27 @@
     print $config_write $line;
 }
 
+# Did the set command work?
+if ($action eq "set"&& $force_option && !$done) {
+
+    # If the force option was set, append the symbol to the end of the file
+    my $line = "#define $name";
+    $line .= " $value" if defined $value && $value ne "";
+    $line .= "\n";
+    $done = 1;
+
+    print $config_write $line;
+}
+
 close $config_write;
 
-die "configuration section not found" if ($action eq "full" && !$done);
-die "$name not found" if ($action ne "full" && !$done);
+if ($action eq "full" && !$done) {
+    die "Configuration section was not found in $config_file\n";
+
+}
+
+if ($action ne "full" && $action ne "unset" && !$done) {
+    die "A #define for the symbol $name was not found in $config_file\n";
+}
 
 __END__
diff --git a/scripts/footprint.sh b/scripts/footprint.sh
index 87d62df..026e7a8 100755
--- a/scripts/footprint.sh
+++ b/scripts/footprint.sh
@@ -1,5 +1,23 @@
 #!/bin/sh
-
+#
+# This file is part of mbed TLS (https://tls.mbed.org)
+#
+# Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
+#
+# Purpose
+#
+# This script determines ROM size (or code size) for the standard mbed TLS
+# configurations, when built for a Cortex M3/M4 target.
+#
+# Configurations included:
+#   default    include/mbedtls/config.h
+#   yotta      yotta/module/mbedtls/config.h
+#   thread     configs/config-thread.h
+#   suite-b    configs/config-suite-b.h
+#   psk        configs/config-ccm-psk-tls1_2.h
+#
+# Usage: footprint.sh
+#
 set -eu
 
 CONFIG_H='include/mbedtls/config.h'
@@ -48,6 +66,7 @@
         scripts/config.pl unset MBEDTLS_NET_C || true
         scripts/config.pl unset MBEDTLS_TIMING_C || true
         scripts/config.pl unset MBEDTLS_FS_IO || true
+        scripts/config.pl --force set MBEDTLS_NO_PLATFORM_ENTROPY || true
     } >/dev/null 2>&1
 
     CC=arm-none-eabi-gcc AR=arm-none-eabi-ar LD=arm-none-eabi-ld \
diff --git a/tests/scripts/basic-build-test.sh b/tests/scripts/basic-build-test.sh
index 06c2eb9..ffca6f9 100755
--- a/tests/scripts/basic-build-test.sh
+++ b/tests/scripts/basic-build-test.sh
@@ -36,8 +36,8 @@
 
 
 # Step 1 - Make and instrumented build for code coverage
-CFLAGS=' --coverage -g3 -O0 '
-make
+export CFLAGS=' --coverage -g3 -O0 '
+make clean; make
 
 
 # Step 2 - Execute the tests
diff --git a/yotta/data/module.json b/yotta/data/module.json
index 164a083..f303783 100644
--- a/yotta/data/module.json
+++ b/yotta/data/module.json
@@ -1,6 +1,6 @@
 {
     "name": "mbedtls",
-    "version": "2.2.2",
+    "version": "2.3.0",
     "description": "The mbed TLS crypto/SSL/TLS library",
     "licenses": [
         {