add wdt.py

12.network/server_base.py

@@ -9,6 +9,17 @@
 
     # in your code
 
+    while True:
+        cl, addr = server.accept()
+        print('client connected from', addr)
+
+        buf = cl.recv()
+
+        if b'open' in buf:
+            print(b'open')
+
+        cl.send(buf)
+        cl.close()
 finally:
     # it will throw error OSError: [Errno 12] ENOMEM if your dont exec the code.
     server.close()

13.system/watchdog.py

@@ -0,0 +1,8 @@
+
+import machine
+
+t = machine.WDT(0, 5) # init wdt 0, timeout 5s
+
+t.feed() # feed it
+
+t.delete() # close it