Specifying default length of UUID for Greentea

This creates a macro for the UUID length used by Greentea. This cuts
down on the use of "magic numbers" in test cases that use
the GREENTEA_SETUP_UUID function.

Author: bridadan

features/FEATURE_LWIP/TESTS/mbedmicro-net/udp_echo/main.cpp

@@ -29,7 +29,7 @@ namespace {
     char rx_buffer[MBED_CFG_UDP_CLIENT_ECHO_BUFFER_SIZE] = {0};
     const char ASCII_MAX = '~' - ' ';
     const int ECHO_LOOPS = 16;
-    char uuid[48] = {0};
+    char uuid[GREENTEA_UUID_LENGTH] = {0};
 }
 
 void prep_buffer(char *uuid, char *tx_buffer, size_t tx_size) {
@@ -127,7 +127,7 @@ void test_udp_echo() {
 
 // Test setup
 utest::v1::status_t test_setup(const size_t number_of_cases) {
-    GREENTEA_SETUP_UUID(120, "udp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "udp_echo", uuid, GREENTEA_UUID_LENGTH);
     return verbose_test_setup_handler(number_of_cases);
 }
 

features/FEATURE_LWIP/TESTS/mbedmicro-net/udp_echo_parallel/main.cpp

@@ -32,7 +32,7 @@ const int ECHO_LOOPS = 16;
 EthernetInterface net;
 SocketAddress udp_addr;
 Mutex iomutex;
-char uuid[48] = {0};
+char uuid[GREENTEA_UUID_LENGTH] = {0};
 
 // NOTE: assuming that "id" stays in the single digits
 void prep_buffer(int id, char *uuid, char *tx_buffer, size_t tx_size) {
@@ -202,7 +202,7 @@ void test_udp_echo_parallel() {
 
 // Test setup
 utest::v1::status_t test_setup(const size_t number_of_cases) {
-    GREENTEA_SETUP_UUID(120, "udp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "udp_echo", uuid, GREENTEA_UUID_LENGTH);
     return verbose_test_setup_handler(number_of_cases);
 }
 

features/frameworks/greentea-client/greentea-client/test_env.h

@@ -43,6 +43,11 @@
 #define TEST_ENV_TESTCASE_FINISH    GREENTEA_TEST_ENV_TESTCASE_FINISH
 #define TEST_ENV_TESTCASE_SUMMARY   GREENTEA_TEST_ENV_TESTCASE_SUMMARY
 
+/**
+ *  Default length for UUID buffers (used during the sync process)
+ */
+#define GREENTEA_UUID_LENGTH        48
+
 /**
  *  Generic test suite transport protocol keys
  */

features/frameworks/greentea-client/source/greentea_test_env.cpp

@@ -91,8 +91,8 @@ void _GREENTEA_SETUP_COMMON(const int timeout, const char *host_test_name, char
  *           This function is blocking.
  */
 void GREENTEA_SETUP(const int timeout, const char *host_test_name) {
-    char _value[48] = {0};
-    _GREENTEA_SETUP_COMMON(timeout, host_test_name, _value, 48);
+    char _value[GREENTEA_UUID_LENGTH] = {0};
+    _GREENTEA_SETUP_COMMON(timeout, host_test_name, _value, GREENTEA_UUID_LENGTH);
 }
 
 /** \brief Handshake with host and send setup data (timeout and host test name)