lwip - Reduced size of buffers in echo-parallel tests

These tests could adopt the dynamically sized buffers used for the
packet-pressure tests, however throughput is not an important feature
of these tests.

Author: geky

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

@@ -10,15 +10,14 @@
 
 
 #ifndef MBED_CFG_TCP_CLIENT_ECHO_BUFFER_SIZE
-#define MBED_CFG_TCP_CLIENT_ECHO_BUFFER_SIZE 256
+#define MBED_CFG_TCP_CLIENT_ECHO_BUFFER_SIZE 64
 #endif
 
 #ifndef MBED_CFG_TCP_CLIENT_ECHO_THREADS
 #define MBED_CFG_TCP_CLIENT_ECHO_THREADS 3
 #endif
 
 
-const char ASCII_MAX = '~' - ' ';
 EthernetInterface net;
 SocketAddress tcp_addr;
 Mutex iomutex;

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

@@ -9,7 +9,7 @@
 #include "unity/unity.h"
 
 #ifndef MBED_CFG_UDP_CLIENT_ECHO_BUFFER_SIZE
-#define MBED_CFG_UDP_CLIENT_ECHO_BUFFER_SIZE 256
+#define MBED_CFG_UDP_CLIENT_ECHO_BUFFER_SIZE 64
 #endif
 
 #ifndef MBED_CFG_UDP_CLIENT_ECHO_TIMEOUT
@@ -21,7 +21,6 @@
 #endif
 
 
-const char ASCII_MAX = '~' - ' ';
 const int ECHO_LOOPS = 16;
 EthernetInterface net;
 SocketAddress udp_addr;