Tests: udpsocket_sendto_invalid relaxed

Author: michalpasztamobica

TESTS/netsocket/udp/udpsocket_sendto_invalid.cpp

@@ -32,8 +32,8 @@ void UDPSOCKET_SENDTO_INVALID()
     SocketAddress addr;
     addr.set_ip_address("");
     addr.set_port(0);
-    // UDP will be able to send 0 bytes, but no particular error is raised
-    TEST_ASSERT_EQUAL(sock.sendto(addr, NULL, 0), 0);
+    // Depending on the stack UDP may be able to send 0 bytes, but may also return some error code.
+    TEST_ASSERT_TRUE(sock.sendto(addr, NULL, 0) <= 0);
 
     TEST_ASSERT_EQUAL(NSAPI_ERROR_OK, NetworkInterface::get_default_instance()->gethostbyname(ECHO_SERVER_ADDR, &addr));
     addr.set_port(9);