lwip: Increased DHCP timeout to 60 seconds

This matches the timeout used in linux:
https://linux.die.net/man/5/dhclient.conf

This resolves several issues noticed during testing when we
have a very large number of devices that try to get an IP address
around the same time.

Author: geky

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

@@ -52,7 +52,7 @@ void test_bring_up_down() {
 // Test setup
 utest::v1::status_t test_setup(const size_t number_of_cases) {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "default_auto", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "default_auto", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
     return verbose_test_setup_handler(number_of_cases);
 }

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

@@ -92,7 +92,7 @@ void test_dns_literal_pref() {
 // Test setup
 utest::v1::status_t test_setup(const size_t number_of_cases) {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "default_auto", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "default_auto", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
     net_bringup();
     return verbose_test_setup_handler(number_of_cases);

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

@@ -30,7 +30,7 @@ void prep_buffer(char *tx_buffer, size_t tx_size) {
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "tcp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "tcp_echo", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits TRUE */ 1); 
     EthernetInterface eth;
     int err = eth.connect();

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

@@ -89,7 +89,7 @@ Echo echoers[MBED_CFG_TCP_CLIENT_ECHO_THREADS];
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "tcp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "tcp_echo", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
 
     int err = net.connect();

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

@@ -37,7 +37,7 @@ bool find_substring(const char *first, const char *last, const char *s_first, co
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "default_auto", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "default_auto", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
 
     bool result = false;

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

@@ -109,7 +109,7 @@ void generate_buffer(uint8_t **buffer, size_t *size, size_t min, size_t max) {
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "tcp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "tcp_echo", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
 
     generate_buffer(&buffer, &buffer_size,

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

@@ -226,7 +226,7 @@ PressureTest *pressure_tests[MBED_CFG_TCP_CLIENT_PACKET_PRESSURE_THREADS];
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "tcp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "tcp_echo", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
 
     uint8_t *buffer;

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

@@ -29,7 +29,7 @@ const int udp_dtls_handshake_count = sizeof(udp_dtls_handshake_pattern) / sizeof
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "udp_shotgun", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "udp_shotgun", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
 
     EthernetInterface eth;

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

@@ -43,7 +43,7 @@ void prep_buffer(char *uuid_buffer, size_t uuid_len, char *tx_buffer, size_t tx_
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "udp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "udp_echo", uuid, 48);
     printf("Got a uuid of %s\r\n", uuid);
     size_t uuid_len = strlen(uuid);
     EthernetInterface eth;

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

@@ -147,7 +147,7 @@ Echo echoers[MBED_CFG_UDP_CLIENT_ECHO_THREADS];
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "udp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "udp_echo", uuid, 48);
     printf("Got a uuid of %s\r\n", uuid);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
 

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

@@ -112,7 +112,7 @@ void generate_buffer(uint8_t **buffer, size_t *size, size_t min, size_t max) {
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(60, "udp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "udp_echo", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
 
     generate_buffer(&buffer, &buffer_size,

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

@@ -251,7 +251,7 @@ PressureTest *pressure_tests[MBED_CFG_UDP_CLIENT_PACKET_PRESSURE_THREADS];
 
 int main() {
     char uuid[48] = {0};
-    GREENTEA_SETUP_UUID(2*60, "udp_echo", uuid, 48);
+    GREENTEA_SETUP_UUID(120, "udp_echo", uuid, 48);
     mbed_set_mac_address(uuid, /*coerce control bits*/ 1);
 
     uint8_t *buffer;

features/FEATURE_LWIP/lwip-interface/lwip_stack.c

@@ -41,8 +41,6 @@
     #define MBED_NETIF_INIT_FN eth_arch_enetif_init
 #endif
 
-#define DHCP_TIMEOUT 15000
-
 /* Static arena of sockets */
 static struct lwip_socket {
     bool in_use;
@@ -463,7 +461,7 @@ nsapi_error_t mbed_lwip_bringup(bool dhcp, const char *ip, const char *netmask,
     u32_t ret;
 
     if (!netif_is_link_up(&lwip_netif)) {
-        ret = sys_arch_sem_wait(&lwip_netif_linked, 15000);
+        ret = sys_arch_sem_wait(&lwip_netif_linked, DHCP_TIMEOUT * 1000);
 
         if (ret == SYS_ARCH_TIMEOUT) {
             return NSAPI_ERROR_NO_CONNECTION;
@@ -502,7 +500,7 @@ nsapi_error_t mbed_lwip_bringup(bool dhcp, const char *ip, const char *netmask,
 
     // If doesn't have address
     if (!mbed_lwip_get_ip_addr(true, &lwip_netif)) {
-        ret = sys_arch_sem_wait(&lwip_netif_has_addr, 15000);
+        ret = sys_arch_sem_wait(&lwip_netif_has_addr, DHCP_TIMEOUT * 1000);
         if (ret == SYS_ARCH_TIMEOUT) {
             return NSAPI_ERROR_DHCP_FAILURE;
         }

features/FEATURE_LWIP/lwip-interface/lwipopts.h

@@ -52,6 +52,8 @@
 #define ADDR_TIMEOUT                0
 #endif
 
+#define DHCP_TIMEOUT                60
+
 #define PREF_IPV4                   1
 #define PREF_IPV6                   2