Adds UDP Greentea test cases

udpsocket_echotest
	udpsocket_echotest_nonblock

TESTS/netsocket/udp/main.cpp

@@ -55,6 +55,17 @@ static void _ifdown() {
     printf("MBED: ifdown\n");
 }
 
+void drop_bad_packets(UDPSocket& sock) {
+    nsapi_error_t err;
+    sock.set_timeout(0);
+    while (true) {
+        err = sock.recvfrom(NULL, 0, 0);
+        if (err == NSAPI_ERROR_WOULD_BLOCK) {
+            break;
+        }
+    }
+}
+
 void fill_tx_buffer_ascii(char *buff, size_t len)
 {
     for (size_t i = 0; i<len; ++i) {
@@ -76,8 +87,9 @@ void greentea_teardown(const size_t passed, const size_t failed, const failure_t
     return greentea_test_teardown_handler(passed, failed, failure);
 }
 
-
 Case cases[] = {
+        Case("Echo", test_udpsocket_echotest),
+        Case("Echo non-block", test_udpsocket_echotest_nonblock),
         Case("Echo burst", test_udpsocket_echotest_burst),
         Case("Echo burst non-block", test_udpsocket_echotest_burst_nonblock),
         Case("Reuse a socket", test_udpsocket_open_close_repeat),

TESTS/netsocket/udp/udp_tests.h

@@ -19,11 +19,14 @@
 #define UDP_TESTS_H
 
 NetworkInterface* get_interface();
+void drop_bad_packets(UDPSocket& sock);
 void fill_tx_buffer_ascii(char *buff, size_t len);
 
 /*
  * Test cases
  */
+void test_udpsocket_echotest();
+void test_udpsocket_echotest_nonblock();
 void test_udpsocket_echotest_burst();
 void test_udpsocket_echotest_burst_nonblock();
 void test_udpsocket_open_close_repeat();

TESTS/netsocket/udp/udpsocket_echotest.cpp

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2018, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mbed.h"
+#include MBED_CONF_APP_HEADER_FILE
+#include "UDPSocket.h"
+#include "greentea-client/test_env.h"
+#include "unity/unity.h"
+#include "utest.h"
+#include "udp_tests.h"
+
+using namespace utest::v1;
+
+namespace
+{
+    static const int SIGNAL_SIGIO = 0x1;
+    static const int SIGIO_TIMEOUT = 5000; //[ms]
+    static const int WAIT2RECV_TIMEOUT = 1000; //[ms]
+    static const int RETRIES = 2;
+
+    UDPSocket sock;
+    Semaphore tx_sem(0, 1);
+
+    static const int BUFF_SIZE = 1200;
+    char rx_buffer[BUFF_SIZE] = {0};
+    char tx_buffer[BUFF_SIZE] = {0};
+
+    static const int PKTS = 22;
+    static const int pkt_sizes[PKTS] = {1,2,3,4,5,6,7,8,9,10, \
+                                        100,200,300,400,500,600,700,800,900,1000,\
+                                        1100,1200};
+}
+
+static void _sigio_handler(osThreadId id) {
+    osSignalSet(id, SIGNAL_SIGIO);
+}
+
+void test_udpsocket_echotest()
+{
+    SocketAddress udp_addr;
+    get_interface()->gethostbyname(MBED_CONF_APP_ECHO_SERVER_ADDR, &udp_addr);
+    udp_addr.set_port(MBED_CONF_APP_ECHO_SERVER_PORT);
+
+    UDPSocket sock;
+    TEST_ASSERT_EQUAL(NSAPI_ERROR_OK, sock.open(get_interface()));
+
+    int recvd;
+    int sent;
+    int s_idx = 0;
+    for (int pkt_s = pkt_sizes[s_idx]; s_idx < PKTS; pkt_s = ++s_idx) {
+        pkt_s = pkt_sizes[s_idx];
+
+        fill_tx_buffer_ascii(tx_buffer, BUFF_SIZE);
+
+        for (int retry_cnt = 0; retry_cnt <= 2; retry_cnt++) {
+            sent = sock.sendto(udp_addr, tx_buffer, pkt_s);
+            if (sent != pkt_s) {
+                printf("[Round#%02d - Sender] error, returned %d\n", s_idx, sent);
+                continue;
+            }
+            recvd = sock.recvfrom(NULL, rx_buffer, pkt_s);
+            if (recvd == pkt_s) {
+                break;
+            }
+        }
+        TEST_ASSERT_EQUAL(0, memcmp(tx_buffer, rx_buffer, pkt_s));
+    }
+    TEST_ASSERT_EQUAL(NSAPI_ERROR_OK, sock.close());
+}
+
+void udpsocket_echotest_nonblock_receiver(void *receive_bytes)
+{
+    int expt2recv = *(int*)receive_bytes;
+    int recvd;
+    for (int retry_cnt = 0; retry_cnt <= RETRIES; retry_cnt++) {
+        recvd = sock.recvfrom(NULL, rx_buffer, expt2recv);
+        if (recvd == NSAPI_ERROR_WOULD_BLOCK) {
+            wait_ms(WAIT2RECV_TIMEOUT);
+            continue;
+        } else if (recvd == expt2recv) {
+            break;
+        }
+    }
+
+    TEST_ASSERT_EQUAL(0, memcmp(tx_buffer, rx_buffer, expt2recv));
+    drop_bad_packets(sock);
+    sock.set_blocking(false);
+
+    tx_sem.release();
+}
+
+void test_udpsocket_echotest_nonblock()
+{
+    SocketAddress udp_addr;
+    get_interface()->gethostbyname(MBED_CONF_APP_ECHO_SERVER_ADDR, &udp_addr);
+    udp_addr.set_port(MBED_CONF_APP_ECHO_SERVER_PORT);
+
+    TEST_ASSERT_EQUAL(NSAPI_ERROR_OK, sock.open(get_interface()));
+    sock.set_blocking(false);
+    sock.sigio(callback(_sigio_handler, Thread::gettid()));
+
+    int sent;
+    int s_idx = 0;
+    Thread *thread;
+    unsigned char *stack_mem = (unsigned char *)malloc(OS_STACK_SIZE);
+    TEST_ASSERT_NOT_NULL(stack_mem);
+
+    for (int pkt_s = pkt_sizes[s_idx]; s_idx < PKTS; ++s_idx) {
+        pkt_s = pkt_sizes[s_idx];
+
+        thread = new Thread(osPriorityNormal,
+                            OS_STACK_SIZE,
+                            stack_mem,
+                            "receiver");
+        TEST_ASSERT_EQUAL(osOK, thread->start(callback(udpsocket_echotest_nonblock_receiver, &pkt_s)));
+
+        for (int retry_cnt = 0; retry_cnt <= RETRIES; retry_cnt++) {
+            fill_tx_buffer_ascii(tx_buffer, pkt_s);
+
+            sent = sock.sendto(udp_addr, tx_buffer, pkt_s);
+            if (sent == NSAPI_ERROR_WOULD_BLOCK) {
+                if (osSignalWait(SIGNAL_SIGIO, SIGIO_TIMEOUT).status == osEventTimeout) {
+                    continue;
+                }
+            } else if (sent != pkt_s) {
+                printf("[Round#%02d - Sender] error, returned %d\n", s_idx, sent);
+                continue;
+            }
+            if (tx_sem.wait(WAIT2RECV_TIMEOUT*2) == 0) { // RX might wait up to WAIT2RECV_TIMEOUT before recvfrom
+                continue;
+            }
+            break;
+        }
+        thread->join();
+        delete thread;
+    }
+    free(stack_mem);
+    TEST_ASSERT_EQUAL(NSAPI_ERROR_OK, sock.close());
+}

TESTS/netsocket/udp/udpsocket_echotest_burst.cpp

@@ -56,18 +56,6 @@ void free_tx_buffers() {
     }
 }
 
-void drop_bad_packets(UDPSocket& sock) {
-    nsapi_error_t err;
-    sock.set_timeout(0);
-    while (true) {
-        err = sock.recvfrom(NULL, NULL, 0);
-        if (err == NSAPI_ERROR_WOULD_BLOCK) {
-            break;
-        }
-    }
-    sock.set_timeout(MBED_CFG_UDP_CLIENT_ECHO_TIMEOUT);
-}
-
 void test_udpsocket_echotest_burst()
 {
     SocketAddress udp_addr;