Improve:wifi hal.

hal/src/WifiHal.cpp

@@ -13,14 +13,58 @@
  * limitations under the License.
  */
 #include "WifiHal.h"
-#include "LinuxApi.h"
 #include "ILog.h"
+#include "LinuxApi.h"
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <thread>
 StatusCode WifiHal::OpenApMode(void)
 {
     LogInfo("OpenApMode. \n");
+    constexpr int SLEEP_TIME_MS = 5;
+    constexpr int WAITING_TIME_MS = 1000 * 10;
+    unsigned int sleepingTime_ms = 0;
+    while (CheckWlan0IfExist() == false) {
+        std::this_thread::sleep_for(std::chrono::milliseconds(SLEEP_TIME_MS));
+        sleepingTime_ms += SLEEP_TIME_MS;
+        if (sleepingTime_ms > WAITING_TIME_MS) {
+            LogError("wlan0 not found. \n");
+            return CreateStatusCode(STATUS_CODE_NOT_OK);
+        }
+    }
+    LogInfo("wlan0 ok. \n");
     fx_system("ifconfig wlan0 192.168.169.1 netmask 255.255.255.0");
     fx_system("hostapd -d /etc/hostapd.conf &");
     fx_system("touch /var/lib/misc/udhcpd.leases");
     fx_system("udhcpd -f /etc/udhcpd.conf &");
     return CreateStatusCode(STATUS_CODE_OK);
 }
+bool WifiHal::CheckWlan0IfExist(void)
+{
+    DIR *dir;
+    struct dirent *entry;
+    int wlan0_found = 0;
+
+    dir = opendir("/sys/class/net");
+    if (dir == NULL) {
+        perror("opendir");
+        return false;
+    }
+
+    while ((entry = readdir(dir)) != NULL) {
+        if (strcmp(entry->d_name, "wlan0") == 0) {
+            wlan0_found = 1;
+            break;
+        }
+    }
+
+    closedir(dir);
+    if (wlan0_found) {
+        return true;
+    }
+    else {
+        return false;
+    }
+}

hal/src/WifiHal.h

@@ -21,5 +21,8 @@ public:
     WifiHal() = default;
     virtual ~WifiHal() = default;
     StatusCode OpenApMode(void) override;
+
+private:
+    bool CheckWlan0IfExist(void);
 };
 #endif