add 5seconds timeout during link check

Author: Bongjun Hur

adafruit_wiznet5k/adafruit_wiznet5k.py

@@ -178,11 +178,13 @@ def __init__(
 
         # First wait link status is on
         # to avoid the code during DHCP - assert self.link_status, "Ethernet cable disconnected!"
+        start_time = time.monotonic()
         while True:
+            if self.link_status or ((time.monotonic() - start_time) > 5) :
+                break
             time.sleep(1)
             if self._debug:
-                        print("My Link is:", self.link_status)
-            if self.link_status: break
+                print("My Link is:", self.link_status)
 
         # Set DHCP
         if is_dhcp: