netinit: Add check mount path retry option for delayed mounts

netutils/netinit/Kconfig

@@ -118,6 +118,13 @@ config NETINIT_THREAD_PRIORITY
 		PHY polling is CPU intensive and can interfere with the usability of
 		of threads competing for CPU bandwidth.
 
+config NETINIT_RETRY_MOUNTPATH
+int "Network initialization retry mount path count"
+default 0
+---help---
+	This should be set if the filesystem get mounted after netinit got started.
+	The netinit thread will check for the mount path before continuing.
+
 endif # NETINIT_THREAD
 
 config NETINIT_DEBUG

netutils/netinit/netinit.c

@@ -334,6 +334,23 @@ static void netinit_set_macaddr(void)
 #  define netinit_set_macaddr()
 #endif
 
+#if CONFIG_NETINIT_RETRY_MOUNTPATH > 0
+static inline void netinit_checkpath(void){
+  int retries = CONFIG_NETINIT_RETRY_MOUNTPATH;
+  do {
+    DIR* dir = opendir(CONFIG_IPCFG_PATH);
+    if (dir) {
+        /* Directory exists. */
+        closedir(dir);
+        break;
+    } else {
+        usleep(100000);
+    }
+    retries--;
+  } while(retries > 0);
+}
+#endif
+
 /****************************************************************************
  * Name: netinit_set_ipv4addrs
  *
@@ -355,6 +372,10 @@ static inline void netinit_set_ipv4addrs(void)
    * file.
    */
 
+#if CONFIG_NETINIT_RETRY_MOUNTPATH > 0
+  netinit_checkpath();
+#endif
+
   ret = ipcfg_read(NET_DEVNAME, (FAR struct ipcfg_s *)&ipv4cfg, AF_INET);
 #ifdef CONFIG_NETUTILS_DHCPC
   if (ret >= 0 && ipv4cfg.proto != IPv4PROTO_NONE)
@@ -512,6 +533,10 @@ static inline void netinit_set_ipv6addrs(void)
    * file.
    */
 
+#if CONFIG_NETINIT_RETRY_MOUNTPATH > 0
+  netinit_checkpath();
+#endif
+
   ret = ipcfg_read(NET_DEVNAME, (FAR struct ipcfg_s *)&ipv6cfg, AF_INET6);
   if (ret >= 0 && IPCFG_HAVE_STATIC(ipv6cfg.proto))
     {