TEST, DO NOT MERGE: debug to reproduce issue ARMmbed#10941

makes UDPSOCKET_ECHOTEST_BURST_NONBLOCK and UDPSOCKET_ECHOTEST_BURST failed.

In the trace, we see only UDPSOCKET_ECHOTEST_BURST_NONBLOCK failed. For
UDPSOCKET_ECHOTEST_BURST, we have :
  Packets sent: 22, packets received 0, loss ratio 1.00
  >>> 'UDPSOCKET_ECHOTEST': 1 passed, 0 failed

Reproduced on NUCLEO_H743ZI (with PR ARMmbed#11274) and also with K64F board :
  mbed test -t IAR -m K64F -v -n tests*netsocket*udp*

Signed-off-by: Vincent Veron <[email protected]>

Author: VVESTM

TESTS/netsocket/udp/udpsocket_echotest.cpp

@@ -101,6 +101,7 @@ void UDPSOCKET_ECHOTEST()
 
     // Packet loss up to 30% tolerated
     if (packets_sent > 0) {
+        packets_recv = 0;
         double loss_ratio = 1 - ((double)packets_recv / (double)packets_sent);
         printf("Packets sent: %d, packets received %d, loss ratio %.2lf\r\n", packets_sent, packets_recv, loss_ratio);
         TEST_ASSERT_DOUBLE_WITHIN(TOLERATED_LOSS_RATIO, EXPECTED_LOSS_RATIO, loss_ratio);

TESTS/netsocket/udp/udpsocket_echotest_burst.cpp

@@ -229,6 +229,7 @@ void UDPSOCKET_ECHOTEST_BURST_NONBLOCK()
     // Packet loss up to 30% tolerated
     TEST_ASSERT_DOUBLE_WITHIN(TOLERATED_LOSS_RATIO, EXPECTED_LOSS_RATIO, loss_ratio);
     // 70% of the bursts need to be successful
+    ok_bursts = 0;
     TEST_ASSERT_INT_WITHIN(3 * (BURST_CNT / 10), BURST_CNT, ok_bursts);
 
     TEST_ASSERT_EQUAL(NSAPI_ERROR_OK, sock.close());