device test updates (esp8266#5455)

add test_ping
fix test_millis_mm

tests/device/test_millis_mm/test_millis_mm.ino

@@ -14,7 +14,6 @@
 extern "C" {                  // SDK functions for Arduino IDE access
 #include "osapi.h"
 #include "user_interface.h"
-#include "espconn.h"
 }  //end, 'extern C'
 
 //---------------------------------------------------------------------------

tests/device/test_ping/test_ping.ino

@@ -0,0 +1,60 @@
+#include <Arduino.h>
+#include <BSTest.h>
+#include <ESP8266WiFi.h>
+
+#include <ping.h>
+
+BS_ENV_DECLARE();
+
+void setup()
+{
+    Serial.begin(115200);
+    Serial.setDebugOutput(true);
+    WiFi.persistent(false);
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(getenv("STA_SSID"), getenv("STA_PASS"));
+    while (WiFi.status() != WL_CONNECTED) {
+        delay(500);
+    }
+    BS_RUN(Serial);
+}
+
+static struct ping_option po;
+static const uint32_t PING_COUNT = 5;
+static volatile uint32_t recv_count;
+static volatile uint32_t done_count;
+
+static void ping_recv(void* options, void* resp)
+{
+    (void)options;
+    (void)resp;
+    ++recv_count;
+}
+
+static void ping_done(void* options, void* resp)
+{
+    (void)options;
+    (void)resp;
+    done_count = ((struct ping_resp*)resp)->total_count;
+}
+
+TEST_CASE("pings sent/answered", "[lwip]")
+{
+	IPAddress address;
+    if (WiFi.hostByName(getenv("SERVER_IP"), address))
+    {
+		po.ip = address;
+		po.count = PING_COUNT;
+		po.coarse_time = 1;
+		po.sent_function = &ping_done;
+		po.recv_function = &ping_recv;
+		ping_start(&po);
+		delay((PING_COUNT+2)*1000);
+    }
+	REQUIRE(recv_count == PING_COUNT);
+	REQUIRE(done_count == PING_COUNT);
+}
+
+void loop()
+{
+}